NEUMANN KH 420 A G NEUMANN KH 420 A G.pdf

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  () /   - ·  - · @. · ..

. / · /

Contents

Important safety instructions ...............................................2

The KH 420 studio monitor..................................................4

Package contents ..........................................................4

Product overview ..........................................................5

Installing and connecting the KH 420 ........................................8

Preparing the loudspeakers ............................................8

Preparing the room...................................................10

Positioning the loudspeaker ...........................................10

Connecting audio signals..............................................13

Connecting/disconnecting the KH 420 to/from the mains power supply......16

Configuring and using the KH 420 ..........................................17

Switching the KH 420 on/o...........................................17

Adjusting the frequency response ......................................17

Adjusting the acoustical level..........................................19

Compensating for video delay (lip sync) ................................20

Compensating for listening distance dierences (time-of-flight) ............20

Activating ground lift .................................................21

Adjusting the brightness of the Neumann logo ...........................22

Cleaning and maintaining the KH 420 .......................................22

Troubleshooting ..........................................................22

Specifications ............................................................23

Accessories ..............................................................25

Appendix

System Block Diagram ............................................I

Pin assignment of the XLR socket....................................I

Acoustical Measurements..........................................I

Installation angles ..............................................VI

Delay Lookup Table ............................................ VII

EN

KH 420 | 1

EN

Installation

Important safety instructions

1. Read these instructions.

2. Keep these instructions. Always include these instructions when passing the product on
to third parties.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Only clean the product when it is not connected to the mains power supply. Clean only
with a dry cloth.

7. Always ensure a free air flow around the cooling fins on the rear of the product. Do not
block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider than the other. A grounding type plug has two blades and
a third grounding prong. The wide blade or the third prong are provided for your safety.
If the provided plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.

10. Protect the power cord from being walked on or pinched, particularly at plugs, conveni­ence receptacles, and the point where it exits from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manu­facturer, or sold with the apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the appara­tus has been damaged in any way, such as power supply cord or plug is damaged, liquid
has been spilled or objects have fallen into the apparatus, when the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.

15. To completely disconnect this apparatus from the AC mains, disconnect the power supply
cord plug from the AC receptacle.

16. WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain
or moisture.

17. Do not expose this equipment to dripping or splashing and ensure that no objects filled
with liquids, such as vases, are placed on the equipment.

18. The mains plug of the power supply cord shall remain readily accessible.

• Ensure that the room in which you use this product is wired in accordance with the local

electrical code and checked by a qualified inspector.

• Only use the product indoors.

• Do not install the product in hot, humid, or excessively dusty locations, in direct sunlight or

in locations where it is exposed to externally generated vibrations.

• Do not place burning objects (e.g. candles) on top of or near the product.

• If condensation has formed on the product, e.g. because it was moved from a cold environ-

ment to a warm one, allow the product to acclimatize to room temperature before using it.

• Do not overload wall outlets and extension cables as this may result in fire and electric

shock.

Magnetic fields

2 | KH 420

WARNING
Interference due to magnetic fields!

This product generates a permanent magnetic field (> 1.5 mT) that can interfere with car­diac pacemakers and implanted defibrillators (ICDs).

X

Always maintain a distance of at least 10 cm (4") between the loudspeaker and the car­diac pacemaker or implanted defibrillator.

DIM 1

DIM 1

DIM 1

Danger due to

high sound

pressure levels

WARNING
Danger of hearing damage due to sudden high sound pressure levels!

Audio signals that are present at switch-on of the product or that can be present during
operation, can create sudden, very high sound pressure levels which can damage your hea­ring.

X

Always lower the output level of the audio source before connecting it to the loudspeaker
or starting it (pressing “play”).

If the DIM1 accessory has been fitted:

X

Always lower the output level of the audio source before switching to a dierent
source (analog/digital) via the SIGNAL SELECT rotary switch L of the DIM1
accessory.

This loudspeaker can be used for commercial purposes. Commercial use is subject to the rules
and regulations of the trade association responsible. Neumann, as the manufacturer, is there­fore obliged to expressly point out possible health risks arising from use. This loudspeaker is
capable of producing sound pressure levels exceeding 85dB(A) SPL. This is the sound pres­sure corresponding to the maximum permissible level which is by law (in some countries)
allowed to aect your hearing for the duration of a working day (8 hours). It is used as a basis
according to the specifications of industrial medicine. Higher sound pressure levels and/or
longer durations can damage your hearing. At higher sound pressure levels, the duration must
be shortened in order to prevent hearing damage. The following are signs that you have been
subjected to excessive sound pressure levels for too long a time:

• You can hear ringing or whistling sounds in your ears.

• You have the impression (even for a short time only) that you can no longer hear high fre-

quencies (temporary threshold shift).

Hazard warnings

on the rear of

the product

Intended use

The label shown on the right is attached to the rear of the
product.

The symbols on this label have the following meaning:
Presence of uninsulated dangerous voltage within the product’s enclo-

sure that may be of sucient magnitude to constitute a risk of fire or
electric shock.

Never open the product or remove the grilles fitted to the product as
there is a risk of electric shock. There are no user serviceable parts
inside. Refer servicing to your Neumann service partner.

Read and follow the safety and operating instructions contained in the
operating manual.

Warning: Hot surface.

Intended use of the product includes:

• having read this operating manual, especially the chapter “Important safety instructions”,

• using the product within the operating conditions and limitations described in this opera-

ting manual.

“Improper use” means using the product other than as described in this operating manual, or
under operating conditions which dier from those described herein.

THIS EQUIPMENT IS NOT SUITABLE FOR USE IN LOCATIONS WHERE CHILDREN ARE LIKELY TO
BE PRESENT.

EN

KH 420 | 3

The KH 420 studio monitor

Thank you for purchasing a Neumann studio monitor. The KH 420 features a Mathematically
Modeled Dispersion™ Waveguide (MMD™), flexible acoustical controls, various input options
and an extensive range of mounting hardware. This allows the loudspeaker to be used in
diverse acoustical conditions, with any source equipment and in a wide variety of physical
locations. The KH 420 represents the latest in acoustic and electronic simulation and measure­ment technologies to ensure the most accurate sound reproduction possible.

The KH420 is designed for use as mid-field and main monitor. It can be used as a front louds­peaker in mid-sized and large multi-channel systems, or as a rear loudspeaker in larger multi­channel systems.

Package contents

1 KH 420
3 Mains cables (European, UK and US versions)
1 Quick guide
1 Safety guide

EN

4 | KH 420

Note that imperial dimensions are approximate.

Product overview

1

2

3

4

5

6

1 Neumann logo

• lights up white:
loudspeaker is switched on and ready for operation

• flashes red:
loudspeaker’s protection system is active
output level is reduced
or, if the optional DIM1 accessory is installed:
A digital signal is selected via the SIGNAL SELECT rotary
switch L but there is no valid digital signal connected

• lights up red:
electronic’s temperature is too high
output level is reduced by 20dB
or
input signal is constantly high
output level is slightly reduced

You can adjust the brightness of the Neumann logo. For more information, refer to
page22.

When installing a Remote Electronics Kit (REK4) the electronics panel and the cabi­net that were originally shipped together should be connected together, otherwise the
anechoic calibration is lost. To help with this during installation, the serial number
shown on the electronics panel is also printed behind the woofer ring 6. To remove the
woofer ring, carefully place your fingers on either side of the inside of the woofer ring,
press outwards, and then pull towards you. To refit the woofer ring, align the pegs with
the holes and gently push until the woofer ring is fully inserted.

2 Treble driver
3 Midrange driver
4 Rotatable waveguide
5 Bass driver
6 Woofer ring*
7 Bass reflex ports

7

EN

KH 420 | 5

9

8

8

8

8

8

8

9

8

8

8 Threaded inserts for mounting hardware

Remove inserted plastic plugs before attaching mounting hardware.

9 Accelerated Heat Tunneling™ cooling fins (AHT™)

EN

6 | KH 420

Pin 1: Audio GND
Pin 2: Signal +
Pin 3: Signal -

ANALOG INPUT

GROUND

CONNECT

PARAMETRIC EQUALIZER

GAIN [dB]

Q

TREBLEMIDBASS

ACOUSTICAL CONTROLS [dB]

25-80

50-160

100-320

OFF

OUTPUT LEVELINPUT GAIN

for 0 dBu

DISPLAY BRIGHTNESS [%]

100

60
30

OFF

OUTPUT

SIGNAL SELECT

DIGITAL DELAY

x 1.6 ms

x 25.6 ms

x 0.1 ms

DIGITAL AES 3

Max. input level

1.2 V pk-pk

unbalanced

INPUT

ANALOG
ANALOG *
DIGITAL A+B
DIGITAL A+B
DIGITAL A
DIGITAL A

DIGITAL B
DIGITAL B

DELAYED

114

94

100

108

LIFT

100
60
30

LOGO

(white)

LIMITER
(red)

Pin 1: Shield
Pin 2: Signal +
Pin 3: Signal -

Sleeve: Shield
Tip: Signal

-12

-5

-2

0

+1

+2

+4

1

1.5

2

2.5
3

4

8

1

2

3

4

5

6

7

FREQUENCY

FREQUENCY RANGE [Hz]

Position

25
32
40
45
52
65
80

25-80

50
64
80

90
105
130
160

50-160

100
130
160
180
210
260
320

100-320

1
2
3
4
5
6
7

-12

-4

-14

-10

-6

-2

[dB SPL at 1 m
for 0 dBu / -18 dB FS]

-1.0

-2.0

+1.0

-1.5

-3.0

-4.5

-2.5

-7.5

-5.0

0

00

Max. input level

7 V pk-pk transformer

balanced

Max. input level
24 dBu (*18 dBu for
analog delayed)

-8

DIM 1

DIM 1

DIM 1

0

A

B

C

M

L

K

I

H

J

0 DISPLAY BRIGHTNESS switch

(Dims the Neumann logo)

A OUTPUT LEVEL switch
B INPUT GAIN control
C ACOUSTICAL CONTROLS switches
D IEC mains socket
E On/o switch I/0
F PARAMETRIC EQUALIZER controls

• PARAMETRIC EQUALIZER | GAIN [dB]

• PARAMETRIC EQUALIZER | Q

• PARAMETRIC EQUALIZER | FREQUENCY [Hz]

• PARAMETRIC EQUALIZER|FREQUENCY RANGE [Hz]

G GROUND switch

(Connects/disconnects ground)

H ANALOG INPUT socket (XLR)

G

F

E

I AES3 INPUT socket (XLR)
J AES3 INPUT socket (BNC)
K AES3 OUTPUT socket (BNC)
L SIGNAL SELECT rotary switch
M DELAY rotary switches

DIM1 is an optional accessory not included in
the package contents of the KH420. If the DIM1
is not installed, the backplate‘s area marked
with DIM1 in the drawing above will be covered
with a sticker.
Always have the DIM1 installed by an autho­rized Neumann service partner.

D

EN

KH 420 | 7

Installing and connecting the KH 420

CAUTION
Danger of injury and material damage due to tipping/dropping of the product!

If improperly mounted, the product and/or the mounting hardware (e.g. rack) can tip over
or drop down.

X

Always have the product mounted by a qualified specialist according to local, national
and international regulations and standards.

X

Use the mounting systems recommended by Neumann and always provide sucient
additional protection against tipping or dropping!

CAUTION
Damage to the product due to overheating!

If air cannot circulate properly around the cooling fins on the rear of the product, the
amplifier(s) may overheat leading to premature activation of the thermal protection system
which limits the maximum output level of the loudspeaker. In rare cases, damage to the
product may also occur.

X

Never cover the entrance and exit slots for the Accelerate Heat Tunneling™ cooling fins.

X

Regularly clean the Accelerate Heat Tunneling™ cooling fins.

X

When installing the product into tight spaces such as wall recesses, maintain an air gap
of at least 5 cm (2") around the rear of the product and provide sucient air circulation.
If necessary, use forced-air cooling (e.g. when flush mounted in a wall), or use a REK4
(remote electronics kit).

EN

Rotating the

MMD™ waveguide

It is possible to remove the electronics panel and locate it remotely, using the REK4
accessory.

For information on installation, please refer to the supplied “Getting Started Quickly”
supplement. This will help you set up the loudspeakers in a way that will give you the
best acoustic performance from the system.

For further information on setting up loudspeakers, please refer to the “Questions &
Answers” section on the product page at www.neumann.com.

For more information on building systems using Neumann loudspeaker products, please
refer to the “Product Selection Guide” at www.neumann.com

Preparing the loudspeakers

CAUTION
Risk of staining surfaces!

Some surfaces treated with varnish, polish or synthetics may suer from stains when they
come into contact with other synthetics. Despite a thorough testing of the synthetics used
by us, we cannot rule out the possibility of staining.

X

Do not place the KH420 on delicate surfaces.

The MMD™ waveguide of the KH420 is rotatable. Rotating the MMD™ waveguide allows you
to place the bass driver either side of it. If the cabinet is positioned upside down, the MMD™
should also be upside down to maintain an optimum response in the bass-midrange crossover
region. In all cabinet orientations, the acoustical axis should point towards the engineer’s
listening position, or the center of the listening area, in both the horizontal and vertical planes
– see the definition of the acoustical axis.

8 | KH 420

See the table below for rotation angles of the MMD™ waveguide depending on the mounting
direction.

If you rotate your cabinet by …

0° 180° 90° clockwise 90° anticlockwise

Your MMD™ waveguide should be rotated within the cabinet by …

0° 0° 90° anticlockwise 90° clockwise

= Acoustical center

To rotate the MMD™, proceed as follows:

X

Lay the loudspeaker cabinet on its back on a soft flat surface so the drivers are facing
upwards. Ensure that none of the control knobs and switches on the back panel can be
damaged by the surface.

X

Undo the four bolts on the MMD™ waveguide using a T25 Torx head screwdriver.

X

Carefully lift the MMD™ waveguide out of the cabinet avoiding scratches on the paintwork
and damage to the sealing strip (pressing the screw to one side, as shown below, and pulling
up can make this task easier):

Flush mounting

the KH420

X

Rotate the MMD™ waveguide to the new orientation (see table above) and position it back
into the front panel cut-out. To avoid rattles, the driver cables are tightly sandwiched bet­ween the rear of the waveguide and the damping material.

X

Ensure that the driver cables do not touch the edges of the cabinet.

X

Tighten the four bolts on the MMD™ waveguide to a torque setting of 2 Nm (1.48 lbf-ft).

X

Test the cabinet sealing by playing a reasonably loud (so you can feel some wind through
the ports) 32Hz sine wave. Then listen for any hissing sounds around the edge of the MMD™
waveguide and its drivers. If there is a hissing sound, the sealing has been compromised
and should be repaired.

Once the waveguide has been rotated the logo will be incorrectly oriented:

X

Carefully lever the logo out using a sharp knife.

X

Reinsert the logo the correct way round.

The benefits of flush mounting are reduced cabinet edge diraction (smoother midrange),
increased bass driver loading (reduced bass distortion), and elimination of rear wall cancella­tions (flatter bass response).

KH 420 | 9

EN

A Remote Electronics Kit is highly recommended to avoid heat dissipation problems and
allow easy adjustment of the controls.

X

Have the flush mounting designed by an experienced acoustic engineer. The following inst­ructions are addressed to this experienced acoustic engineer.

X

Design the flush mounting wall‘s construction angles such that the loudspeaker’s acoustical
axis directly points horizontally and vertically towards the listening position or the centre
of the listening area.

X

Acoustically isolate the cabinet from the wall. This avoids transmission of vibrations to the
flush wall.

To avoid midrange coloration:

X

Do not put a “picture frame” around the edge of the cabinet that sticks out from the wall and
front panel. Also avoid any other acoustical discontinuities near the cabinet.

X

Compensate the acoustical loading using the recommended acoustical control settings
shown in the “Adjusting the frequency response” section on page 17. A heavier wall
provides more loading which should be compensated with more “bass” attenuation.

If the loudspeaker must be covered:

X

Use a thin open weave cloth. Two layers of very thin material will improve opacity.

Preparing the room

X

Arrange the loudspeaker setup symmetrically in the listening room.

X

Arrange all acoustically relevant surfaces and objects symmetrically on either side of the
listening axis of the room (left/right).

X

Minimize the sound that is reflected back to the listening position by using angled surfaces
and/or acoustical treatment.

This product has been optimized for use in recording studios. In order to not aect the
quality of reproduction, make sure that the product is used in an EMC (electromagneti­cally compatible) environment.

EN

Distances

Positioning the loudspeaker

X

Carry out the following steps very accurately, since the more accurate the physical arran­gement of the loudspeakers in the room, the more accurate the reproduction will be at the
listening position.

X

Observe the recommended distances between the loudspeakers and your listening position
(imperial dimensions are approximate):

• Minimum: 1.25 m (4')

• Recommended: 1.5–3.0 m (5'–9')

• Maximum: 11.0 m (33')

X

Avoid positioning the loudspeaker at a distance “d
wall behind the loudspeaker.

When positioning bass managed loudspeakers:

X

Avoid a distance “d
Similarly, avoid these distances from solid side walls or a solid ceiling. Respecting these

” of 0.8 to 1 m (2' 6" to 3') from a solid wall behind the loudspeaker.

wall

positioning limitations reduces the chances of dips and peaks in the low frequency res­ponse (comb filtering) caused by strong reflections.

” of 0.8 to 2 m (2' 6" to 6') from the

wall

10 | KH 420

When positioning vertically oriented cabinets:

-30°

Front Left Front Center Front Right

0°

When positioning horizontally oriented cabinets:

-30°

0°

+30°

+30°-30°

+30°

Arranging the

loudspeakers

Front Left Front Center Front Right

+30°-30°

X

Copy the diagram “Installation angles” that can be found at the end of this operating
manual.

X

Place the diagram at the listening position or center of the listening area.

X

Using a tape measure, place the loudspeakers at the same distance from the center of the dia­gram “Installation angles”. To ensure good imaging, do this at an accuracy of at least 1cm

1

/

(

").

2

EN

KH 420 | 11

X

Make sure that the distances are equal:

Surround
Left

Front Left

Length I

Length I

Front Center Front Right

Length I

Length I

Listening

position

Length I

Surround

Right

EN

If the loudspeakers cannot be placed at the same distance from the listening position:

X

Compensate for distance dierences > 1 cm (

1

/

") by delaying closer loudspeakers by 30 s/

2

cm (76 s/inch).

If you are using the DIM1 accessory:

X

Use the DELAY rotary switches M to compensate for distance dierences (see
page20).

The DELAY rotary switchesM allow for corrections with a resolution of 3.44cm
(13/8"), any small remaining time-of-flight adjustment should be made by moving
the loudspeaker cabinet.

X

Check the location of the loudspeaker cabinet. This depends on the application:

• 2.0 systems (stereo): ±30°, plus optional subwoofer(s)

• 5.1 systems:
ITU-R BS.775-1: 0°, ±30°, ±110° (±10°), plus optional subwoofer(s)
(center, front left/right, surround left/right)
ANSI/SMPTE 202M: 0°, ±22.5°, arrays to the surround left and to the surround right,
plus optional subwoofer(s)

• 7.1 systems: 0°, ±30°, ±90°, ±150°, plus optional subwoofer(s)
(center, front left/right, side left/right, back left/right)

12 | KH 420

x = 16.5 cm
y = 49.9 cm

The acoustical axis of the KH420 starts from the midpoint of the mid range and tweeter dri­vers.

X

Always point the acoustical axis, in the horizontal and vertical planes, towards the listening
position.

The acoustical axis is a line perpendicular to the loudspeaker’s front panel along which
the microphone was placed when tuning the loudspeaker’s crossover during design.
Pointing the acoustical axis, in the horizontal and vertical planes, towards the listening
position or center of the monitoring area will give the best measured and perceived
sound quality.

X

Position the loudspeaker so that there is a direct line of sight from the listening position to
the bass, midrange and tweeter drivers.

Connecting audio signals

X

Always use good quality cables with the correct impedance and appropriate termination to
avoid signal drop outs and to achieve the maximum cable lengths shown below:

Connecting

Connecting

XLRcables

XLRcables

Signal (connector) Impedance Cable length Connection method

Analog (RCA) low up to 10 m

(30')

via an adapter (RCA-XLR)
to the ANALOG INPUT socket
(XLR) H (see page14)

Analog (XLR) low up to 100 m

(300')

directly to the ANALOG INPUT
socket (XLR) H (see page14)

Connecting analog signals

Digital signals can only be connected when the DIM1 module is installed.

X

Connect the left and right output of your analog audio source to the XLR input sockets of the
respective loudspeaker.

XLR

XLR

EN

Signal A

Signal B

Analog Source

KH 420 | 13

DIM 1

DIM 1

DIM 1

Connecting

unbalanced cables

X

Use an RCA-XLR adapter (not supplied) to connect unbalanced cables (e.g. RCA cables).

X

Use the following wiring if you want to make your own RCA-XLR adapter:

Wiring Pin Signal

1 Audio ground
2 Signal +
3 Signal −

If there is a humming sound from the loudspeaker, activate ground lift to disconnect
pin1 of the ANALOG INPUT socket (XLR)H from the loudspeaker’s chassis ground.

Connecting digital signals to the KH420 with the DIM1 installed

X

Always use good quality cables with the correct impedance and appropriate termina­tion to avoid signal drop outs and to achieve the maximum cable lengths shown below:

Signal (connector) Impedance Cable length Connection method

AES3 (BNC) 75 Ω up to 100 m

(300')

directly to the AES3 INPUT
socket (BNC)J of the DIM1

Connecting

AES3 cables

AES3 (XLR) 110 Ω up to 100 m

(300')

S/P-DIF (RCA) 75 Ω up to 10 m

(30')

X

Connect the digital AES3 or S/P-DIF-output signal of your audio source to the AES3
INPUT socket I or J of the DIM1. See figure below.

The DIM1 only supports non-encoded AES3 and S/P-DIF signals. Encoded sig­nals such as MP3, DTS or Dolby Digital are not supported.

X

Make an appropriate setting (“DIGITAL A” or “DIGITALB”) on the SIGNAL SELECT
rotary switchL. The setting depends on the signal channel order and the loudspeaker
position.

Only one cable is needed for uncompressed AES3 and S/P-DIF digital signals
(single-wire mode). They contain two audio channels: “subframe A” and “sub­frame B”. Usually, the audio channels are:

Subframe A Subframe B

Left Right
Center LFE
Surround left Surround right
Back left Back right

directly to the AES3 INPUT
socket (XLR)I of the DIM1

via an adapter (RCA-BNC)
to the AES3 INPUT socket
(BNC)J
or via an adapter (RCA-XLR)
to the AES3 INPUT socket
(XLR)I of the DIM1

EN

A clock input is not required because loudspeakers are not audio sources and the
converters are clocked to a very stable internally generated clock source.

14 | KH 420

To connect an additional loudspeaker:

Set back panel switch to “DIGITAL A”

Set back panel switch to “DIGITAL B”

XLR
or
BNC
In

Set back panel switch to “DIGITAL A”

Set back panel switch to “DIGITAL B”

DIM 1

DIM 1

DIM 1

X

Use the AES3 OUTPUT socket K of the DIM1. See figure below.

X

Make an appropriate setting (“DIGITAL A” or “DIGITAL B”) on the SIGNAL SELECT
rotary switch L.

XLR
or
BNC
In

BNC
Out

RCA, BNC or XLR

BNC
In

Subframe A - left signal

Subframe B - right signal

Digital Source:

AES 3 or S/P-DIF

Connecting multiple KH420 loudspeakers together digitally via the DIM1

X

Use the AES3 INPUT J and OUTPUT socket (BNC) K. T-pieces are not required (see

figure below).

X

Make an appropriate setting (“DIGITAL A” or “DIGITAL B”) on the SIGNAL SELECT
rotary switch L.

End of the line external termination is not required as the AES3 INPUT socket (BNC) J
already has an internal 75 Ω termination.

BNC
Out

RCA, BNC or XLR

BNC InBNC

Out

Subframe A - left signal

Subframe B - right signal

Digital Source:

AES 3 or S/P-DIF

BNC
In

BNC
Out

BNC
In

EN

KH 420 | 15

Setting the SIGNAL SELECT rotary switch L

DIM 1

DIM 1

DIM 1

X

Select one of the following settings, depending on your needs:

Setting Meaning

ANALOG
DIGITAL A

DIGITAL B

DIGITAL A+B Digital subframe A summed with digital subframe B

Each of these can be selected with and without delay added, so it is very quick to bypass
the delay.

The digital output is a buered copy of the digital input signal which can be used to feed
the digital signal onto other loudspeakers or products. There is no digital output from the
AES3 OUTPUT socket (BNC) K when an analog signal is connected to the ANALOG INPUT
socket H, therefore the DIM1 cannot be used as an analog-to-digital converter. Delay is
not added to the digital output, so any delay required on subsequent loudspeakers in the
daisy chain should be made on those loudspeakers.

ANALOG INPUT socket (XLR) H
Digital subframe A, AES3 INPUT socket (BNC) J or

AES3 INPUT socket (XLR)I
Digital subframe B, AES3 INPUT socket (BNC) J or

AES3 INPUT socket (XLR)I

and a 6dB attenuation, AES3 INPUT socket (BNC) J or
AES3 INPUT socket (XLR)I

Connecting/disconnecting the KH 420 to/from the mains power supply

EN

To connect the KH 420 to the mains power supply:

X

Make sure that the on/o switchE is set to “0”.

X

Connect the IEC connector of the supplied mains cable to the mains socket D.

E

D

Power Source

X

Connect the mains plug of the mains cable to a suitable wall socket.

To disconnect the KH 420 from the mains power supply:

X

Set the on/o switch E to “0”.

X

Pull the mains plug out of the wall socket.

16 | KH 420

Configuring and using the KH 420

Switching the KH 420 on/o

X

Set the on/o switch to:

• “I” to switch on the loudspeaker. The Neumann logo lights up, provided that it has not
been switched o by means of the DISPLAY BRIGHTNESS switch 0 (see page 22).

• “0” to switch o the loudspeaker. The Neumann logo goes o.

There is an approximate five second delay before sound can be heard from the loud­speaker in order to avoid noises (pops) from preceding equipment switched on at the
same time. Conversely, switching o the loudspeaker immediately mutes the audio.

Adjusting the frequency response

When all its acoustical controls are set to 0dB, the KH 420 loudspeaker is designed to have
a flat frequency response in anechoic conditions. When the loudspeaker is installed in your
monitoring environment, the response changes. The same loudspeaker installed in dierent
positions in the same room may require dierent acoustical control settings. In a symmetri­cal installation, left/right pairs (front or back) will probably have the same acoustical control
settings.

X

Before using your loudspeaker system for the first time, calibrate the frequency response of
the loudspeakers in the room in order to obtain the desired response.

X

Repeat the above step if you change the physical conditions in your studio.

X

At your listening position, determine the frequency response of each loudspeaker.

X

Use the ACOUSTICAL CONTROLS switches C to adjust the frequency response.

Recommended frequency responses measured at the listening position:

• Studio applications: flat

• Film applications: X-curve shape (see ANSI/SMPTE 202M)

• Home applications: subjective evaluation

EN

KH 420 | 17

ACOUSTICAL CONTROLS

Function Possible settings

switches C

Bass Compensates for acoustical

loading in the low frequency
range due to nearby large solid
boundaries (e.g. walls).

Mid Compensates for a “harshness” in

the sound quality experienced in
some installations. The source of
this is usually comb filtering due
to desktop and/or ceiling reflec­tions.

Treble Compensates for insucient or

excessive high-frequency
damping in the room.

Parametric EQ Compensates for low and low-mid

frequency anomalies.
Desktop loading typically causes

a wide bump 2-6dB high between
100 and 300Hz.
Reflections from nearby bounda­ries (walls, floor, ceiling) cause
constructive and destructive
interference.
Strong room resonances are
audible and should be reduced
with the parametric EQ.

0, −2.5, −5, −7.5dB

0, −1.5, −3, −4.5dB

+1, 0, −1, −2dB

Gain: +4 to −12dB
Freq: O,

25 to 80,
50 to 160,
100 to 320Hz

Q: 1 to 8

EN

OUTPUT LEVEL INPUT GAIN

[dB SPL at 1 m
for 0 dBu / -18 dB FS]

114

108

100

94

for 0 dBu

0

+1

-2

-5

-12

Max. input level
24 dBu (*18 dBu for
analog delayed)

+2

+4

GAIN [dB]

ACOUSTICAL CONTROLS [dB]

-2

-14

-4

-6

-8

-2.5

-12

-5.0

-10

-7.5

PARAMETRIC EQUALIZER

2.5

2

3

1.5

8

1

Q

3

2

4

1

FREQUENCY

Position

00

-1.5

-3.0

-4.5

4

5

6

7

1
2
3
4
5
6
7

+1.0

0

-1.0

-2.0

TREBLEMIDBASS

OFF

25-80

50-160

100-320

FREQUENCY RANGE [Hz]

25-80

50-160

105
130
160

100-320

50
64

80
90

25
32
40
45
52
65
80

100
130
160
180
210
260
320

18 | KH 420

The following settings can be used as a starting point for further adjustment:

Loudspeaker position ACOUSTICAL CONTROLS

switches C

PARAMETRIC
EQUALIZER controls F

Bass Mid Treble Gain Freq. Q

In a corner −7.5dB – – -3 200 4
Next to or flush mounted into

an acoustically solid wall (e.g.

−5.0dB – – – – –

brick, concrete)
Next to or flush mounted into

an acoustically soft wall (e.g.

−2.5dB – – – – –

gypsum)
Free standing in an untreated

room
Free standing in a well-treated

room
In a small room with strong

side wall reflections
Near a small desktop or small

reflecting surface*
Near a large desktop or large

reflecting surface*

* Use these settings in addition to one of the top settings

−2.5dB −1.5dB −1dB – – –

– – – – – –

−5.0dB – – – – –

– −1.5dB – -2 250 4

– −3.0dB – -3 160 4

It is recommended to use a properly setup acoustic measurement system when setting
the acoustical controls. This is particularly true when setting the parametric equalizer.

Adjusting the acoustical level

X

On your KH 420 loudspeakers, set the OUTPUT LEVEL switch A to the lowest possible value
of 94dB SPL and the INPUT GAIN control B to −15dB.

X

Play a broadband pink noise test signal that is set to −18dBFS (Europe) or −20dBFS (USA)
on the mixing console‘s output level meters.

X

Measure the sound pressure level at the listening position using a sound level meter with
the following settings:

• “C”-weighted

• slow integration time

X

Set the OUTPUT LEVEL switch A and the INPUT GAIN control B of your loudspeakers so
that the desired acoustic level is obtained.

Recommended sound pressure levels:

Application Sound pressure level

Film 85dB(C)
Broadcast 79 to 83dB(C)
Music No defined reference levels

If the Neumann logo flashes red, the loudspeaker‘s protection system has been activated.
Toavoid this and achieve the desired output level, use larger loudspeakers or add a bass
managed subwoofer to the system.

EN

KH 420 | 19

Examples of sound pressure levels as a function of the input and output level of the KH 420:

DIGITAL DELAY

Input signal

[dBu]

INPUT GAIN control B

0

(0.775 V)

0

(0.775 V)

+4

(1.23 V)

0 −15 −4 −15

−20

(77.5 mV)

[dB]

OUTPUT LEVEL switch A

100 100 94 114

[dB SPL] at 1 m

Sound pressure level

100 85 94 79

[dB SPL] at 1 m

Compensating for video delay (lip sync)

Signal processing in LCD, Plasma and LED screens, digital projectors with LCD or DLP
chips, and video processors used in broadcast centers delays the video signal.

The delay is disturbing when audio leads video by more than 20ms or lags by more than
40ms.

To compensate for the video signal delay, the audio signal can be delayed by up to

409.5ms, which is 10.2 frames at 40ms/frame or 12.3 frames at 33ms/frame. The same

value should be used for all loudspeakers in the system.

Please consider the information on latency on page21.

EN

x 25.6 ms

x 1.6 ms

x 0.1 ms

DIGITAL B
DIGITAL B
ANALOG
ANALOG *
DIGITAL A+B
DIGITAL A+B
DIGITAL A
DIGITAL A

DELAYED

SIGNAL SELECT

Compensating for listening distance dierences (time­of-flight)

Loudspeakers placed at dierent distances suer from time-of-flight dierences which
aects imaging. The delay resolution is small enough (0.1ms) that the delay can be used
for time-of-flight adjustment (3.44 cm or 1 3/8" steps).

To compensate for the time-of-flight delay, the audio signal of the KH420 can be delayed
by up to 409.5ms, which is 140.87m (462'2"). Loudspeakers positioned closer to the
listening position should be delayed to be the same as the furthest loudspeaker from the
listening distance.

Example
Loudspeaker A listening distance: 1.50 m
Loudspeaker B listening distance: 1.65 m

Time-of-flight dierence: 0.15 m
So loudspeaker A should be delayed by the time equivalent of 0.15 m which is 0.436ms

(0.15 m / 3.44 cm x 0.1ms). The nearest setting of the DELAY rotary switches M is 0.4ms,
so set the 0.1ms switch to position 4.

Please consider the information on latency on page21.

If a video delay compensation has already been made, add the time-of-flight dierence
(here: 0.4ms) to the setting already made.

20 | KH 420

DIM 1

DIM 1

DIM 1

Example

Video delay compensation on loudspeaker A: 2 x 40ms/frame
Desired time-of-flight compensation for loudspeaker A: 0.4ms

Time-of-flight compensation: 80.4ms
This delay value can be made with these switch settings: 3 x 25.6ms, 2 x 1.6ms, 4 x 0.1ms.

The latency of the analog-to-digital and digital-to-analog converters should be
taken into account when using the DELAY rotary switches M for time-of-flight com­pensation. For the digital-to-analog conversion (input signal via digital connector),
the latency is dependent on the sample rate (values can be seen in the Specifica­tions table on page 24). The analog-to-digital-to-analog conversion (input sig­nal via analog connector) is fixed at 0.54ms.

For time-of-flight compensation delay, calculate the desired delay value then sub­tract the appropriate latency depending on the input signal and sample rate, and
then set the needed additional delay using the delay switches on the back panel.

Example:

Distance compensation for 1m: 1m / 344m/s = 2.91ms: 2.91ms
Digital input signal, sample rate: 48kHz, latency: 0.85ms

2.06ms
Delay settings:

0 x 25.6ms, 1 x 1.6ms, 5 x 0.1ms
(equals 2.1ms, which is the nearest value)

For video delay compensation, converter latency can be ignored as it is insignifi­cant compared to long video signal delays.

To help with choosing a delay setting there is a set of lookup tables at the end of
this operating manual. Also Neumann has made a delay calculator which is availa­ble at www.neumann.com.

Activating ground lift

If there is humming or buzzing noise coming from the loudspeaker, first search for the cause
of the noise:

X

Disconnect all input and output signal cables from the loudspeaker.
If the noise goes away, it is probably coming from the audio source or source cabling.
It might be possible to eliminate the noise by disconnecting the ground from the input signals

(activating ground lift).

To activate ground lift:

X

Reconnect the signal cables and set the GROUND switch G to “LIFT”.

This internally disconnects pin 1 of the ANALOG INPUT socket (XLR)H from the loudspeaker’s

chassis ground (see diagram “Pin assignment of the XLR socket” on page14).

For safety reasons, the electronics chassis ground is always connected to the mains
power earth pin.

EN

KH 420 | 21

Adjusting the brightness of the Neumann logo

WARNING
Danger of hearing damage due to unexpected high sound pressure levels!

If the Neumann logo is switched o, it is not obvious whether the product is switched on or o. In this case, unex­pected high sound pressure levels can cause hearing damage.

X

Always set the audio sources connected to the loudspeaker to a low output level before they deliver an audio
signal.

X

If you switch o or dim the Neumann logo, mention this to everyone who works with this loudspeaker or the
connected audio sources.

To dim or switch o the Neumann logo in low light level environments or when the loudspeaker is placed behind an
acoustically transparent screen:

X

Set the DISPLAY BRIGHTNESS switch 0 to:

• “30%”, “60%” or “100%” to adjust the Neumann logo to dierent brightness levels.

• “OFF” to switch o the Neumann logo.
When the loudspeaker’s protection system is active or invalid digital signals are connected to the DIM1 acces-

sory, the color of the Neumann logo changes from white to red. The brightness of this red limiter indication
corresponds to the setting of the DISPLAY BRIGHTNESS switch 0 (“30%”, “60%” or “100%”). However, you
cannot completely switch o the limiter indication, as it appears with a brightness of 30% even if the DISPLAY
BRIGHTNESS switch 0 is set to “OFF”.

Cleaning and maintaining the KH 420

EN

CAUTION
Damage to the product caused by liquids!

Liquids entering the product can cause a short-circuit in the electronics and damage or even destroy the product.

X

Keep all liquids away from the product!

X

Before cleaning, disconnect the product from the mains power supply.

X

Use a soft, dry, and lint-free cloth to clean the product. Do not use any solvents or cleaning agents.

X

Never touch the driver diaphrams.

X

Check the Accelerate Heat Tunneling™ cooling fins for any build-up of dust and flu every six months.

The cooling fins can be cleaned without opening the electronics panel:

X

Blow clean compressed air into the heatsink vents on the side of the electronics panel.

Troubleshooting

Problem Cause Solution

The Neumann logo is o, no
sound is heard from the KH 420

The Neumann logo is o or not
clearly visible, but sound is
heard from the KH 420

The Neumann logo is flashing
red but there is no sound

The KH 420’s internal main fuse
has blown.

The Neumann logo is switched o
or dimmed.

A DIGITAL signal is selected on
the SIGNAL SELECT rotary switch
L but there is no valid audio
signal connected to the digital
input.

Have the product checked by an
authorized Neumann service partner.

Switch on the Neumann logo
and switch o the dimming (see
page 22) .

Connect a valid signal to the digital
input, check the cabling, or set the
SIGNAL SELECT rotary switchL to
ANALOG.

22 | KH 420

Problem Cause Solution

There is hum or buzz coming
from the KH 420 when the audio
cable is connected.

For further information, please refer to the “Questions & Answers” section on the product page at www.neumann.com

Bad cabling or ground loop in the
installation.

Check all cabling to eliminate the
cause of the problem, change from
unbalanced to balanced cabling,
or use the GROUND switch G (see
page 21).

Specifications

Acoustics

Free field frequency response 26Hz to 22kHz ±3dB
Pass band free field frequency response 28Hz to 20kHz ±2dB
Self-generated noise (INPUT GAIN set to 0dB,

OUTPUT LEVEL set to 100dB SPL)
Total harmonic distortion < 0.5% at 95dB SPL at 1m > 120Hz

Max. SPL in free space with a sine wave at 3% THD at 1m,
calculated half-space

Bass capability: Max. SPL in half space at 3% THD at 1m 109.9 dB SPL

Max. short term SPL with IEC-weighted noise (IEC 60268-5) at
1m, in typical listening conditions

Max. short term SPL with music material at 2.3m,
in typical listening conditions (pair)

Max. long term SPL with pink noise at 2.3m,
in typical listening conditions (single / pair)

MMD™ waveguide nominal dispersion angle 110˚ x 80˚

Electronics

Woofer Class AB amplifier,
continuous (peak) output power

Midrange Class AB amplifier,
continuous (peak) output power

Tweeter Class AB amplifier,
continuous (peak) output power

Controller design analog, active
Crossover frequencies; crossover slope
Acoustical controls Bass (40 Hz): 0, -2.5, -5, -7.5 dB

Protection circuitry Excursion limiter: Low

Infrasonic filter frequency; slope 9Hz; 18dB/oct.

< 19dB(A) at 10cm

116.4 / 122.4 dB SPL
(averaged between 100 Hz and 6 kHz)

(averaged between 50 Hz and 100 Hz)
109dB(C) SPL

102dB(C) SPL (full range)
109dB(C) SPL (with subwoofer)

90 / 96dB(C) SPL (full range)
90 / 96dB(C) SPL (with subwoofer)

295W (330W), THD and noise <0.1%
with deactivated limiter

130W (140W), THD and noise <0.1%
with deactivated limiter

130W (140W), THD and noise <0.1%
with deactivated limiter

th

570Hz, 2.0kHz; 24dB/oct., 4

Mid (900 Hz): 0, -1.5, -3, -4.5 dB
Treble (10 kHz): +1, 0, -1, -2 dB

Parametric equalizer

Gain: +4 to −12dB
Freq: O,

25 to 80,
50 to 160,
100 to 320Hz

Q: 1 to 8

Peak limiter: Low
Thermo limiter: Low, Mid, High
Overheat protection: Amplifiers

order

EN

KH 420 | 23

Analog input

Input type XLR, electronically balanced
Impedance 14 kW
Input gain control (sensitivity) 0dB to −15dB
Output level control 94, 100, 108, 114dB SPL
CMRR > 56dB, 100Hz to 15kHz

Maximum input level 24dBu

Digital input (when optional DIM1 accessory is fitted)

Signal format XLR, BNC AES3, S/P-DIF
Impedance XLR, balanced 110 W (input)
Impedance BNC, unbalanced 75 W (input and output)
Input switching Analog/Digital A/Digital B/Digital A+B
Digital converter: resolution, design 16 … 24-bit
Digital converter: sampling rates [kHz]* 22.05, 24, 32, 44.1, 48, 64, 88.2, 96,

176.4, 192

Digital sensitivity -18dBFS = 100dB SPL at 1 m
Dynamic range: A-D-A, D-A
THD+N: analog delayed, digital
Maximum delay: time / distance
Maximum delay: audio-video synchronization

(lip sync)
Minimum delay resolution: time / distance
Latency D-A (with delay = 0ms) **

> 116dB(A), 123dB(A)
< -104dB, < -106dB (typically)

409.5ms / 140.87 m (462' 2")

10.2 at 40ms/frame

12.3 at 33ms/frame

0.1ms / 3.4 cm (1 3/8")

1.84ms at 22.05kHz

1.70ms at 24kHz

1.28ms at 32kHz

0.93ms at 44.1kHz

0.86ms at 48kHz

0.64ms at 64kHz

0.47ms at 88.2kHz

0.43ms at 96kHz

0.24ms at 176.4kHz

0.22ms at 192kHz
Latency A-D-A (with delay = 0ms)
DELAY setting acknowledgement
Digital error /Loudspeaker’s protection system is active

0.54ms

Neumann logo “Red” 1 flash
Neumann logo “Red” continuous flashes

EN

*

These are the sample rates for which the delay setting value shown on the back panel is valid.

**

Depending on the sample rate, this value should be added to the delay setting on the back panel to give the total delay.

Product properties

Power supply 100 to 240V~, 50/60Hz
Power consumption (idle) 60 W (+ 5 W when the DIM1 is fitted)
Power consumption (full output AC) 800 W
Dimensions (H x W x D)

645 x 330 x 444 mm
(25

3

/

" x 13" x 17

8

1

/

2

")
External volume 93 l
Weight 35.0 kg (77 lbs 3 oz)

(+ 100 g (3 oz) when the DIM1 is fitted)

Drivers
bass, midrange, treble

magnetically shielded
250 mm (10"), 75 mm (3"), 25mm (1")

24 | KH 420

Threaded inserts for Neumann mounting hardware Rear panel screws for attaching the

LH41 base plate or LH42 ceiling system

Cabinet surface finish, Color Painted wood and polyurethane,

Anthracite (RAL 7021) or other RAL color
Rear panel: black powdered coated steel

Temperature

Operation and storage, unpacked +10 °C to +40 °C (+50 °F to +104 °F)
Transport and storage, packed in original packaging 25 °C to +70 °C (13 °F to +158 °F)

Relative humidity

Operation and storage, unpacked max. 75 % (non-condensing)
Transport and storage, packed in original packaging max. 90% (non-condensing)

Acoustical measurements, block diagram and pin assignment

Additional technical data such as acoustical measurements, a block diagram of the KH 420 and the pin assignment of
the XLR socket can be found at the end of this operating manual.

Accessories

Product Description

DIM1 Digital input module
FKH 420 Flight case for one KH 420
GKH420 Metal grille
LH28 Tripod stand adapter
LH29 TV spigot (lighting stand adapter)
LH36 Tilting adapter
LH37 Subwoofer adapter
LH41 Base plate
LH42 Ceiling system
LH43 Surface mounting plate
LH45 Wall bracket
LH46 Adjustable ceiling drop adapter
REK4 Remote electronics kit

KH 420 | 25

EN

EN

26 | KH 420

System Block Diagram/Blockschaltbild/SynoptiqueSystème/Diagrama

e

de Bloques del Sistema

DIM 1 only

S/P-DIF can be received on the BNC
connectors with a suitable adapter

BNC: AES3 Output

BNC: AES3 Input

XLR: AES3 Input

XLR: Analog Input

GND Lift

Analog
Digital A
Digital B

Digital A + B

(all available with
and without delay)

Receiver

192 kHz

Signal
Select

24-bit

25.6 ms

Delay

ADC

1.6 ms

0.1 ms

Fine

Gain

DAC

Coarse

–2.5
–5.0
–7.5

Bass

Display Dimmer

100%
60%
30%
0%

Production

Trimmers

18var

0

0

–1.5
–3.0
–4.5

+4

+1

0
–1
–2

TrebleMid

–12

G f Q

Parametric

0
25–80
50–160
100–320

Cross-

Over

(24 dB/

oct)

Limi-

ters

Switched-Mode

Power Supply

Switched-Mode

Power Supply

Power

on Mute

Power

Ampliers

Treble

Midrang

Bass

Pin assignment of the XLR socket/Buchsenbelegung XLR/Brochage de la
prise XLR/Asignación de la hembra XLR

1 Audio ground/Audio-Erdung/Masse audio/Toma de tierra de audio
2 Signal +/Signal +/Signal +/Señal +
3 Signal −/Signal −/Signal −/Señal −

Acoustical Measurements/Akustische Messungen/
Mesures acoustiques/Mediciones Acústicas

EN Below are acoustical measurements conducted in anechoic conditions at 1 m. Color versions of these

graphs can be found on the appropriate product page of the web site.

DE Die folgenden akustischen Messungen wurden unter reflexionsarmen Bedingungen in 1 m Abstand

durchgeführt. Farbversionen dieser Diagramme finden Sie auf den entsprechenden Produktseiten der
Neumann-Website.

FR Vous trouverez ci après les courbes correspondant aux mesures acoustiques eectuées en chambre

sourde, à une distance de 1 mètre du moniteur. Vous retrouverez ces courbes, en couleur, dans la sec­tion appropriée de notre site Web.

ES Las siguientes mediciones acústicas se han realizado bajo condiciones de baja reflexión a una distancia

de 1 m. Encontrará versiones a color de estos diagramas en las páginas correspondientes de los produc­tos en la página web de Neumann.

EN

DE

FR

KH 420 | I

ES

EN

DE

Harmonic Distortion at 90 dB SPL | Klirrfaktor bei 90 dB SPL

Distorsion harmonique à 90 dB SPL | Distorsión armónica total a 90 dB SPL

Harmonic Distortion at 100 dB SPL | Klirrfaktor bei 100 dB SPL

Distorsion harmonique à 100 dB SPL | Distorsión armónica total a 100 dB SPL

FR

ES

Free-Field Response | Freifeld-Frequenzgang | Réponse en champ libre

Respuesta en frecuencia en campo libre

II | KH 420

Harmonic Distortion at 95 dB SPL | Klirrfaktor bei 95 dB SPL

Distorsion harmonique à 95 dB SPL | Distorsión armónica total a 95 dB SPL

y 10 %)
3 %

SPL máximo a 1 m (1 %,

Maximaler SPL bei 1 m (1 %, 3 % und 10 %)

Niveau SPL maximal, à 1 m (1 %, 3 % et 10 %) |

Maximum SPL at 1 m (1 %, 3 % and 10 %) |

Parametric Equalizer | Parametrischer Equalizer

Égaliseur paramétrique | Ecualizador paramétrico

EN

DE

Group Delay | Gruppenlaufzeit | Temps de propagation de groupe

Retardo de grupo

Acoustical Controls | Akustikregler

Eet des correcteurs de compensation acoustiques | Regulador acústico

KH 420 | III

FR

ES

EN

DE

FR

Cumulative Spectral Decay | Zerfalls spektrum | Décroissance spectrale cumulée | Caída espectral acumulada

ES

IV | KH 420

126

-24-21 -21-18 -18-15 -15-12 -12-9 -9-6 -6-3 -3-0 0-3

Frequency (Hz)

126

90

-24-21 -21-18 -18-15 -15-12 -12-9 -9-6 -6-3 -3-0 0-3

Frequency (Hz)

-24–-21-21–-18 -18–-15-15–-12 -12–-9-9–-6 -6–-3-3-00-3

126

Frequency (Hz)

126

Frequency (Hz)

-24–-21-21–-18 -18–-15-15–-12 -12–-9-9–-6 -6–-3-3-00-3

Vertical Directivity Plot (Vertical Cabinet Orientation)

Vertikales Abstrahlverhalten (Vertikale Gehäuseausrichtung)

Directivité verticale (Orientation verticale du coret)

Directividad vertical (Orientación vertical del gabinete)

30

60

90

Horizontal Directivity Plot (Vertical Cabinet Orientation)

Horizontales Abstrahlverhalten (Vertikale Gehäuseausrichtung)

Directivité horizontale (Orientation verticale du coret)

Directividad horizontal (Orientación vertical del gabinete)

-30

0

Angle (°)

-30

0

-90

-60

-60

20000

15849

12445

10116

7943

6237

5070

3981

3126

2541

1995

1567

1274

1000

785

638

501

394

320

251

197

160

Vertical Directivity Plot (Horizontal Cabinet Orientation)

Vertikales Abstrahlverhalten (Horizontale Gehäuseausrichtung)

Directivité verticale (Orientation horizontale du coret)

Directividad vertical (Orientación horizontal del gabinete)

-90

20000

15849

12445

10116

7943

6237

5070

3981

3126

2541

1995

1567

1274

1000

785

638

501

394

320

251

197

160

Horizontal Directivity Plot (Horizontal Cabinet Orientation)

Horizontales Abstrahlverhalten (Horizontale Gehäuseausrichtung)

Directivité horizontale (Orientation horizontale du coret)

Directividad horizontal (Orientación horizontal del gabinete)

Angle (°)

30

60

60

90

60

90

Angle (°)

0

30

30

-30

Angle (°)

0

-30

-90

-60

-60

20000

15849

12445

10116

7943

6237

5070

3981

3126

2541

1995

1567

1274

1000

785

638

501

394

320

251

197

160

-90

20000

15849

12445

10116

7943

6237

5070

3981

3126

2541

1995

1567

1274

1000

785

638

501

394

320

251

197

160

3D directivity data for room simulation software tools (CATT, EASE and ULYSSES) is available as a download on the KH420 product page at www.neumann.com.

EN

DE

FR

KH 420 | V

ES

Installation angles/Aufstellwinkel/Angles d‘installation/

22.5°22.5°

Ángulos de colocación

60°

30°

90°

100°

110°

120°

150°

180°

EN

DE

FRFR

0°

30°

150°

60°

90°

100°

110°

120°

ES

VI | KH 420

Delay Lookup Table/Wertetabelle Delay/Tableaux de
valeurs Delay/Tabla de valores Delay

Switch 1 (25.6 ms) Switch 2 (1.6 ms)

[feet] [inches] 50 Hz 60 Hz [feet] [inches] 50 Hz 60 Hz

Time [ms] Distance [m] Distance [Imperial] Frames Time [ms] Distance [m] Distance [Imperial] Frames

Posi-

tion

EN

DE

1 25.6 8.806 28 11 0.6 0.8 1.6 0.550 1 10 0.0 0.0

2 51.2 17.613 57 9 1.3 1.5 3.2 1.101 3 7 0.1 0.1

3 76.8 26.419 86 8 1.9 2.3 4.8 1.651 5 5 0.1 0.1

0 0.0 0.000 0 0 0.0 0.0 0.0 0.000 0 0 0.0 0.0

4 102.4 35.226 115 7 2.6 3.1 6.4 2.202 7 3 0.2 0.2

7 179.2 61.645 202 3 4.5 5.4 11.2 3.853 12 8 0.3 0.3

5 128.0 44.032 144 6 3.2 3.8 8.0 2.752 9 0 0.2 0.2

8 204.8 70.451 231 2 5.1 6.1 12.8 4.403 14 5 0.3 0.4

6 153.6 52.838 173 4 3.8 4.6 9.6 3.302 10 10 0.2 0.3

9 230.4 79.258 260 0 5.8 6.9 14.4 4.954 16 3 0.4 0.4

11 281.6 96.870 317 10 7.0 8.4 17.6 6.054 19 10 0.4 0.5

10 256.0 88.064 288 11 6.4 7.7 16.0 5.504 18 1 0.4 0.5

12 307.2 105.677 346 9 7. 7 9.2 19.2 6.605 21 8 0.5 0.6

15 384.0 132.096 433 5 9.6 11.5 24.0 8.256 27 1 0.6 0.7

13 332.8 114.483 375 7 8.3 10.0 20.8 7.155 23 6 0.5 0.6

14 358.4 123.290 404 6 9.0 10.8 22.4 7.706 25 3 0.6 0.7

FR

KH 420 | VII

ES

Delay Lookup Table/Wertetabelle Delay/Tableaux de
valeurs Delay/Tabla de valores Delay

[feet] [inches] 50 Hz 60 Hz

EN

DE

Switch 3 (0.1 ms)

Time [ms] Distance [m] Distance [Imperial] Frames

Posi-

tion

1 0.1 0.034 0 1 0.0 0.0

2 0.2 0.069 0 3 0.0 0.0

3 0.3 0.103 0 4 0.0 0.0

5 0.5 0.172 0 7 0.0 0.0

0 0.0 0.000 0 0 0.0 0.0

4 0.4 0.138 0 5 0.0 0.0

7 0.7 0.241 0 9 0.0 0.0

8 0.8 0.275 0 11 0.0 0.0

6 0.6 0.206 0 8 0.0 0.0

9 0.9 0.310 1 0 0.0 0.0

11 1.1 0.378 1 3 0.0 0.0

12 1.2 0.413 1 4 0.0 0.0

13 1.3 0.447 1 6 0.0 0.0

15 1.5 0.516 1 8 0.0 0.0

10 1.0 0.344 1 2 0.0 0.0

14 1.4 0.482 1 7 0.0 0.0

FR

ES

VIII | KH 420