Klein + Hummel 0300 D Installation And Operation Manual

O300 D

Active

Studio Monitor

Installation and Operation

Page 2 Active Studio Monitor O 300 D

Safety InstructionsSafety Instructions

Safety Instructions

It is absolutely essential that you read these safety instructions carefully before connecting and using this K+H product. Y our safety depends on it. Furthermore, failure to follow these instructions voids the warranty . T o ensure

safe operation for years to come, keep these instructions in a safe place for future reference. K+H has manufactured this product in accordance with IEC 92 (SEC) 39 standards, then tested and delivered it in safe operating condition. To maintain it in this condition, you must:

• observe all safety instructions,

• use the product only as described herein,

• have any maintenance, repairs, or modifications performed only by K+H or other authorized personnel, and

• ensure that the room in which you use this product is wired in accordance with the local electrical code.

Warning!

• When the interior of the cabinet is exposed, touching some parts can lead to an electric shock.

• If you need to gain access to the interior electronics of the unit, always disconnect the unit from any and all power

sources first.

• Any repairs, maintenance, or other service of the unit when its interior compartment is exposed may only be performed safely (in accordance with VBG 4) by authorized technicians familiar with all the risks involved. Even in an unplugged state, a fully charged capacitor in the unit can zap the unsuspecting.

• Loudspeaker output jacks labeled with the IEC 417/5036 emblem (Fig. A, right) may be carrying dangerously high voltages. If your unit has this emblem, ensure that any connections to be made between these jacks and the speakers themselves are made before powering up the unit, and are done so only with manufacturer-approved interconnecting cables.

• If you need to replace any fuses, ensure that the replacements are of exactly the same type, value and voltage as the originals, as spelled out in the technical specifications at the rear of this manual.

• Do not use "repaired" fuses.

• If you do not have any fuses on hand of the specified size, type, and value, do not hot-wire the

contacts in the holder by short-circuiting them.

• Certain areas of the cabinet, cover, and rear panel can achieve extreme temperatures and are therefore marked with a "HOT" label (Fig. B). Refrain from touching any heat sink or ventilation grille.

• High volume levels are known to cause permanent - i.e. irreversible - hearing damage, especially when listened to without sufficient breaks. The higher the levels, the more frequent and extended must be the breaks. Avoid standing too close to loudspeakers that are being driven at high levels. If you must be exposed to high sound pressure levels over an extended period of time, use hearing protection.

Mains Connection:

• This unit is designed for continuous operation.

• Ensure that the operating voltage of the unit matches that of the local mains current (AC line voltage).

• Always check before connecting the power cable to the mains socket that the power switch on the unit itself is set

to off ("O").

• Use the power cable or power supply that came with the unit to connect to the mains socket (wall outlet).

• Power supply: a damaged power cable may not be repaired. Use a new cable.

• Avoid plugging the mains cable into a power strip that already has several other power-consuming devices

connected to it.

• Avoid using extension cables. The unit must be connected to a mains socket close to it, and that socket should be freely accessible.

Installation:

• This product may only be placed on a stable, clean, horizontal surface.

• Do not expose this product to vibration.

• Do not operate this product anywhere near water or other liquids. Do not use it near a sink, swimming pool,

bathtub, or in any damp room or area. Electrical shocks carried through water can kill. Do not place any beverages whatsoever on or near this product, as liquids can kill electronic components.

• Ensure sufficient ventilation around the product to allow for adequate heat dissipation, especially near the rear panel and the sides of the cabinet (minimum of 8 inches from the nearest wall). The unit may only be installed in a rack if measures are taken to ensure sufficient ventilation and if the mounting instructions of the manufacturer are followed. Do not block or cover any heat sink, fan, or vent.

• Do not place the product where it will be in the path of direct sunlight, and keep it a safe distance away from radiators and other heaters of any kind.

• If you bring this product from a cold environment into a warm one (such as from a vehicle into a studio), it is quite possible that condensation will form inside the cabinet. Please allow the unit sufficient time for acclimatisation to room temperature (minimum thirty minutes) before connecting and powering up.

• T o avoid accidents, do not use any accessory equipment with this product which is not approved by the manufacturer , particularly mounting accessories. Do not place this unit on any unstable platform, cart, stand or table. Should the unit fall, it can cause bodily injury to persons, or can be damaged itself.

• To protect this product from lightning damage during a thunderstorm or from power surges during an extended absence, disconnect the power cable from the wall outlet.

Fig. A

Fig. B

Active Studio Monitor O 300 D Page 3

Figure 1 Front view

TT

T

able of Contents:able of Contents:

able of Contents:

Safety Instructions............................................2

Table of Contents..............................................3

1. Installation and Operation..........................4

1.1 Important Notes on Safety.........................4

1.2 Operating Conditions.................................4

1.3 Speaker Placement...................................4

1.4 MAINS Connection....................................4

1.5 MAINS Switch.............................................4

1.6 MAINS Fuse...............................................4

1.7 Level / Room Compensation / Ground Lift ..5

1.7.1 XLR Input.................................................5

1.7.2 BNC Input................................................5

1.7.3 Level ATT(ENUATOR)...........................6

1.7.4 INPUT SELECTOR Switch..................6

1.7.5 EQ (Room Compensation)...................6

1.7.6 GROUND LIFT.......................................7

1.8 CONTROLLER..........................................7

1.8.1 CONTROLLER SELECT Switch........7

1.9 Display Functions......................................7

1.10 Front Grille................................................7

1.11 Care of the Cabinet.................................7

2. Test Measurements......................................8

3. Warranty Information..................................10

4. Technical Specifications...........................11

Page 4 Active Studio Monitor O 300 D

1. Installation and Operation1. Installation and Operation

1. Installation and Operation

1.1 1.1

1.1

It is absolutely essential that you readIt is absolutely essential that you read

It is absolutely essential that you read

and observe the Safety Instructions onand observe the Safety Instructions on

and observe the Safety Instructions on page 2 before connecting or using thispage 2 before connecting or using this

page 2 before connecting or using thispage 2 before connecting or using this

page 2 before connecting or using this device.device.

device.device.

device.

1.2 1.2

1.2

Operating conditionsOperating conditions

Operating conditions

The K+H model O 300 D active studio monitor is intended for use over a range of ambient temperatures from +10° C to +40° C (+50° F to +104° F). During transport or storage, temperatures from -25° C to +70° C (-13° F to 158° F) are permissible.

1.3 Speaker placement1.3 Speaker placement

1.3 Speaker placement

The loudspeaker chassis used in the O 300 D are magnetically shielded, so you are free to set the speakers right next to a video monitor without needing to worry about adversely affecting the screen. Furthermore, the baffle of the O 300 D is designed in such a way as to disperse the sound very evenly not just on axis but over quite a wide listening area. Any engineer who has sat at a console for any length of time will appreciate the considerable freedom of movement afforded by the O 300 D. The cabinet is normally designed to be used in the horizontal position, as the vertical angle of dispersion has intentionally been made narrower than the horizontal. The cabinets are constructed in a left version and a right version. For best stereo imaging and depth of soundstage, position the cabinets with the tweeters on the outside, at ear height, pointing directly at the listening position. If you use the O 300 D as a center speaker, set the cabinet vertically, with the tweeter and midrange dome at the top. In certain applications where there are hard reflective surfaces immediately to the left or right of the speakers, it may make more sense to set the cabinets vertically, in which case the narrower dispersion pattern will help reduce comb-filter effects. When choosing a location for the speakers, be aware that you can take advantage of the integral room-compensating equalizer, which will be described in detail in section 1.7.5 . The cabinet can be mounted directly to a wall or ceiling with the aid of the LH 25 mounting bracket. On the left and right sides of the cabinet you will find threaded bushings of 8 mm diameter to which this bracket attaches. As an alternative, you can use the LH 28 stand-mount adapter

to set the speaker on a standard 35-mm (1-3/8”) tripod. Please make certain that these two threaded openings are always sealed, either with the plastic plugs that come standard with the cabinets or with the screws holding the mounting adapter in place. Otherwise you may experience some air noise and possibly some degradation in low-frequency response.

1.4 MAINS 1.4 MAINS

1.4 MAINS

ConnectionConnection

Connection

The amplifier electronics of the standard European model are set up for an AC line voltage of 230 volts, 50 or 60 Hz. Export versions with other voltages are also available. If the power plug of the mains cable should ever need to be replaced, ensure that the connection to the protective earth is maintained.

1.5 MAINS Switch (POWER)

When you switch on power to the unit, there is a five-second delay before the amplified signal is sent to the drivers. This delay avoids the loud popping sounds that otherwise may be generated by devices earlier in the signal chain as power reaches them. You will find this arrangement particularly useful if your studio uses a master switch to power up all the equipment at once. When power on the O 300 D is turned off, on the other hand, or if there is a general power failure, the signal flow to the speaker is immediately cut off, preventing any loud pops.

1.6 Mains FUSE1.6 Mains FUSE

1.6 Mains FUSE

When replacing the fuse,

first disconnect the

mains cable

and ensure that the new fuse is of

the following type only:

for 230 volts AC 1.6 A Slo-Blo (5 x 20 mm) for 117 volts AC 3.15 A Slo-Blo (5 x 20 mm) for 100 volts AC 4 A Slo-Blo (5 x 20 mm)

12

10

13

Active Studio Monitor O 300 D Page 5

1.7 LEVEL / ROOM COMPENSA1.7 LEVEL / ROOM COMPENSA

1.7 LEVEL / ROOM COMPENSA

TION / GROUND LIFTTION / GROUND LIFT

TION / GROUND LIFT

1.7.1 XLR INPUT1.7.1 XLR INPUT

1.7.1 XLR INPUT ANALOG / DIGITANALOG / DIGIT

ANALOG / DIGITANALOG / DIGIT

ANALOG / DIGIT

AL - AES/EBUAL - AES/EBU

AL - AES/EBU

The sensitivity of the tranformer-balanced floating input is +6 dBu (1.55 V). The threepin female XLR jack is wired in the standard manner (pin 1 = ground, pin 2 = +, pin 3 = -). If you are connecting unbalanced analog sources, you will need to solder a bridge between pins 1 and 3:

In digital mode, this same XLR input accepts the digital signal according to the AES/EBU specification (110 Ohm balanced).

1.7.2 INPUT:1.7.2 INPUT:

1.7.2 INPUT: DIGITDIGIT

DIGITDIGIT

DIGIT

AL INPUT / THROUGHAL INPUT / THROUGH

AL INPUT / THROUGH

This digital input, configured as a 75-Ohm BNC connector, is intended to receive signal

sources in S/P-DIF or AES 3id format. The incoming digital signal line requires

oneone

one 75 -Ohm terminator at the very end, as the O 300 D has no internal termination.

The XLR input and the BNC input are wired in parallel across a transformer. The fact that the termination is wired externally allows you to make connections in a wide variety of ways:

1.7.2.1 Source 1x AES/EBU, monitors1.7.2.1 Source 1x AES/EBU, monitors

1.7.2.1 Source 1x AES/EBU, monitors connected with each other via BNC cableconnected with each other via BNC cable

connected with each other via BNC cableconnected with each other via BNC cable

connected with each other via BNC cable

To obtain an output voltage of 1 Vpp at the BNC-output connector (with 75 - Ohm terminator), an input voltage of 5 Vpp at the AES/EBU input is required. This complies with the rules for AES/EBU level. If the input level varies, the output level does so accordingly.

2

1

Figure 2 Rear View

unbalanced balanced

as seen from solder terminals of male XLR

Page 6 Active Studio Monitor O 300 D

1.7.2.2 Source 2x AES/EBU1.7.2.2 Source 2x AES/EBU

1.7.2.2 Source 2x AES/EBU

1.7.2.3 Source 1x S/P-DIF or 1x AES 3id,1.7.2.3 Source 1x S/P-DIF or 1x AES 3id,

1.7.2.3 Source 1x S/P-DIF or 1x AES 3id, connection using two T - connectorsconnection using two T - connectors

connection using two T - connectorsconnection using two T - connectors

connection using two T - connectors

1.7.2.4 Source 2x S/P-DIF or 2x AES 3id1.7.2.4 Source 2x S/P-DIF or 2x AES 3id

1.7.2.4 Source 2x S/P-DIF or 2x AES 3id

1.7.3 Level A1.7.3 Level A

1.7.3 Level A

TT(ENUTT(ENU

TT(ENU

AA

A

TOR)TOR)

TOR)

This rotary level control allows for continuous damping of the input signal in a range from 0 to -24 dB in both analog and digital modes.

1.7.4 INPUT SELECTOR Switch1.7.4 INPUT SELECTOR Switch

1.7.4 INPUT SELECTOR Switch

Use a screwdriver to change the position of this recessed switch in order to select analog or digital mode of operation. Since one digital input carries both stereo channels, the Input Selector has three additional positions for establishing how the monitors are assigned to the channels. This works as follows:

Position A = Analog mode (XLR input) Position R = Digital mode right channel Position L = Digital mode left channel Position M = Digital mode mono (summed

from both left and right channels)

Simultaneous operation from one analog and one digital source is not possible. At any given time you may connect only one type of source to the pair.

1.7.5 EQ (Room compensation)1.7.5 EQ (Room compensation)

1.7.5 EQ (Room compensation)

Three 4-way recessed rotary switches (adjustable with a screwdriver) are available for frequency compensation due to room acoustics and speaker placement.

1.7.5.1 BASS Switch1.7.5.1 BASS Switch

1.7.5.1 BASS Switch

For equalizing anomalies in the lower frequencies due to proximity to room boundaries:

Position 0 = free space Position -3 = 1 boundary (wall) Position -6 = 2 boundaries (corner) Position -9 = 3 boundaries (corner + ceiling)

1.7.5.2 MID Switch1.7.5.2 MID Switch

1.7.5.2 MID Switch

For equalizing anomalies in the midrange due to reflections arising from placement on the console’s meter bridge:

Position 0 = free space Position -2 = mid reduction of -2 dB Position -4 = mid reduction of -4 dB Position -6 = mid reduction of -6 dB

1.7.5.3 HIGH Switch1.7.5.3 HIGH Switch

1.7.5.3 HIGH Switch

Compensates for high-frequency anomalies due to excessive reflection or absorption in the room:

Position 1 = treble boost of +1 dB Position 0 = linear Position -1 = treble reduction of -1 dB Position -2 = treble reduction of -2 dB

Note: Since it is not feasible to list all possible combinations of speaker placement and room acoustics, we strongly recommend checking the switch settings acoustically or by measurement.

4

3

6

5

7

Active Studio Monitor O 300 D Page 7

The controls protected beneath theThe controls protected beneath the

The controls protected beneath the plastic caps may not beplastic caps may not be

plastic caps may not beplastic caps may not be

plastic caps may not be tampered with under anytampered with under any

tampered with under anytampered with under any

tampered with under any circumstances!circumstances!

circumstances!circumstances!

circumstances!

1.7.6 GROUND LIFT1.7.6 GROUND LIFT

1.7.6 GROUND LIFT

Since the input is transformer-balanced and floating, you should rarely experience any hum. In unusual cases, or if the source is unbalanced, it may be necessary to lift the connection between signal ground and chassis ground, in which case you will find this little switch convenient. The chassis ground remains always connected to the protective earth conductor.

WW

W

arning!arning!

arning!

The protective earth conductor mustThe protective earth conductor must

The protective earth conductor must never be interrupted even for testnever be interrupted even for test

never be interrupted even for testnever be interrupted even for test

never be interrupted even for test purposes! This may be dangerous topurposes! This may be dangerous to

purposes! This may be dangerous topurposes! This may be dangerous to

purposes! This may be dangerous to life!life!

life!life!

life!

1.8 CONTROLLER1.8 CONTROLLER

1.8 CONTROLLER

The O 300 D Studio Monitor includes controller electronics (limiter and analog filtering) that are finely tuned to match its three drivers. In order to be compatible with future developments (such as FIR - filter technology), a connector for external controllers was included. Using this connection renders the internal D/A converters, analog input stages, filters and limiters inactive, with the sole exception of the bass peak limiter. For optimal power amp utilization even under varying voltage conditions and loads, the peak limiter in the woofer channel was left in, but the thermo limiter is deactivated.

1.8.1 CONTROLLER SELECT Switch1.8.1 CONTROLLER SELECT Switch

1.8.1 CONTROLLER SELECT Switch

This switch is used to deactivate the internal controller. By way of the jack labeled

POWER - AMP DIRECT INPUT

you can feed in signals intended for the three internal power amplifiers. This 7-pin female XLR jack is wired as follows:

Pin 1 = woofer input + Pin 2 = woofer input Pin 3 = midrange input + Pin 4 = midrange input Pin 5 = tweeter input + Pin 6 = tweeter input Pin 7 = ground

1.9 Display functions1.9 Display functions

1.9 Display functions

The illuminated K+H logo serves as a status indicator for the loudspeaker cabinet.

Constant red: Normal operation, internal

power in order

Blinking red: Overload protection circuitry

engaged

If the light is blinking, this indicates that the overload-protection circuitry has been triggered, as may happen while cuing up a tape deck or while running sine wave signals through the speakers for measurement purposes. Output power is reduced to a level that takes the speakers out of danger. If this happens, you must search for the cause and possibly reduce the monitoring level.

1.10 Front grille1.10 Front grille

1.10 Front grille

A front grille for the speaker baffle is not included as standard equipment, but one is available as an option. This fine mesh metal grille (article GO 300) is easy to attach and offers added protection to the exposed components. The acoustical effect on the speakers is minimal.

1.11 Care of the cabinet1.11 Care of the cabinet

1.11 Care of the cabinet

The cabinet housing of the K+H O 300 D active studio monitor is available in either a flocked or enamel finish (charcoal: RAL color 7021). With the flocked housing, a certain amount of “hair loss” within the first few weeks is normal, and can be avoided simply by going over the cabinet

8

9

14

11

Figure 3 Effects of room compensation on frequency

!

Page 8 Active Studio Monitor O 300 D

Figure 4 Horizontal Dispersion Pattern

Figure 5 Vertical Dispersion Pattern

with a vacuum cleaner once it has been set in place. The housing should be cleaned of dust from time to time in like manner. If you plan on taking your monitors from studio to studio, the flocked finish is preferable since it wears well. For non-mobile use, the enamel finish is preferred, as it won’t be subject to any extreme

wear and tear. Take care when handling the enamel - coated cabinet not to damage the finish. To clean the cabinet, use a soft cloth with a mild cleaning agent only. Under no circumstances should you use alcohol - based or chemical agents, nor any cleaners with abrasive action.

2. T2. T

2. T

est Measurementsest Measurements

est Measurements

The outstanding acoustic impression made by the O 300 D is confirmed by measurements using today’s most critical test methods. The test plots shown here and on the next several pages are

but a small sampling of these measurements.

Active Studio Monitor O 300 D Page 9

Using the new material LRIM (

LL

Low

RR

Resonance

II

Integral

MM

Molding) allowed us to seamlessly integrate a waveguide into the baffle that is ideal for optimal dispersion, with a mild horn-shape around the mid-range dome and an elliptical horn

for the tweeter. Thus came to be the dispersion pattern we mentioned earlier which is narrower vertically and broader horizontally, as is clearly evident in the test plots presented in Figures 4 and 5.

Figure 6 Free-field response

Figure 7 Distortion @ 95 dB at a distance of 1 meter

Figure 8 Group delay

Page 10 Active Studio Monitor O 300 D

Since the enclosure is sealed, the increase in group delay at low frequencies (Figure 8) is quite

minimal, resulting in particularly tight, precise bass response.

The spectral decay plot of the loudspeaker reveals excellent decay and an absence of

Figure 9 Cumulative spectral decay (waterfall)

3. W3. W

3. W

arranty Informationarranty Information

arranty Information

All K+H products undergo an extensive procedure of quality control testing before leaving the factory. Before semiconductors are mounted on the circuit board, they are subject to rigorous tests. Every single unit is guaranteed to match its technical specifications within strict predetermined tolerances. Please store the original carton in a safe, dry place. If you should ever need warranty service, put the unit in its original packing material and carton together with a detailed description of the problem, and ship it (freight prepaid) to our distributor.

K+H warrants, that the product is free from any defects in both material and manufacturing and that it meets the specifications. A warranty case can only be acknowledged under condition that the complaint is filed to our distributor or to us in

writing

within 8 dayswithin 8 days

within 8 days after delivery or detection of the fault. Not covered under this warranty are damages due to inexpert packing and shipment, wear and tear, improper handling, installation, operation and maintenance. The limitation period for warranty claims is described in the terms and conditions of K+H GmbH. Its our choice to repair, to supply a new product or to withdraw from the contract. In the event warranty service is required, presentation of a warranty card will not be necessary. Proof of purchase date can be made by filing copies of appropriate documents (invoice, delivery note).

unwanted overtones and standing waves.

Active Studio Monitor O 300 D Page 11

4. T4. T

4. T

echnical Specificationsechnical Specifications

echnical Specifications

O 300 DO 300 D

O 300 D

Maximum SPLMaximum SPL

Maximum SPL

in half-space, 3% THD at 1 m distance 112.8 dB/SPL averaged between 100 Hz and 6 kHz

Free-field Frequency ResponseFree-field Frequency Response

Free-field Frequency Response 40 Hz - 20 kHz ( ± 2 dB)

Self-noise Self-noise

Self-noise

@10 cm@10 cm

@10 cm 20 dB(A)

TT

T

otal Harmonic Distortionotal Harmonic Distortion

otal Harmonic Distortion

100 Hz and above @1m < 0.5% @95dB/SPL

ElectronicsElectronics

Electronics

Power amplifiers

Bass amplifier 150 watts RMS (THD < 0.1%)

250 watts peak

Midrange amplifier 65 watts RMS (THD < 0.1%)

75 watts peak

Treble amplifier 65 watts RMS (THD < 0.1%)

110 watts peak

Controller type analog, active (also accepts external controller)

Crossover Crossover frequencies 650 Hz / 3.3 kHz

Crossover slopes 24 dB / octave

Room EQ Bass 0; -3; -6; -9 dB

Mid 0; -2; -4; -6 dB High +1; 0; -1; -2 dB

Subsonic filter

Cut-off frequency 30 Hz Slope 6 dB / octave

Protection circuitry Limit against overloading of LF, MF, and HF drivers

Analog input Impedance 14 kOhm (transformer-balanced and floating)

Sensitivity +6 dBu Volume control continuously variable from 0 dB to -24 dB Common mode rejection >70 dB @ 15 kHz

Digital inputs and outputs

XLR: AES/EBU impedance 110 Ohms, transformer balanced and

floating

BNC: S/P-DIF, AES 3id 75 Ohms, unbalanced Terminator 75 Ohms, for BNC jack (external, not included) Sensivity –12,5 dBFs Volume control continuously variable from 0 dB to -24 dB Switch analog / digital left / digital mono / digital right

Digital convertor Resolution, Type 24-bit DA, Delta - Sigma

Sampling rate 32 - 96 kHz

Page 12 Active Studio Monitor O 300 D

Indicators Operational status K+H logo constantly illuminated

Limit/Clip K+H logo blinking

Mains Power fixed voltage, verify on device label

Power consumption

Idle 18 VA Full power 240 VA

Physical characteristicsPhysical characteristics

Physical characteristics

Connectors

Mains Three terminal Euro connector Analog / digital inputs XLR connector, 3-pin Digital inputs / outputs B N C Direct ins to power amps XLR connector, 7-pin

Drivers, magnetically shielded

LF system 210 mm (8’’) Ø, 8 Ohms, polypropylene cone Midrange system 76 mm (3’’) Ø, 8 Ohms, soft dome HF system 25 mm (1’’) Ø, 6 Ohms, Titanium dome tweeter

Cabinet finish enamel or nylon-fiber flock

Cabinet color

Standard version charcoal-gray (RAL 7021) Other colors optional

Loudspeaker covering optional fine-mesh metal grille

Mounting options 2x M 8 threaded bushings on sides

for use with LH 25 mounting bracket 2x rear angle brackets with predrilled ¼’’ holes

Mounting adapters LH 28 tripod fixture

for use only with LH 25 mounting bracket LH 29 TV pin for use only with LH 25 mounting bracket

Dimensions (W x H x D) 383 mm x 253 mm x 290 mm (310 mm with grille)

15’’ x 10’’ x 11½’’ (12¼’’ with grille)

Volume 28 litres / 0.99 cubic feet

Weight 13.5 kg / 30 lbs

K+H Vertriebs- und Entwicklungsgesellschaft mbH

30900 Wedemark, Germany

Phone +49 (5130) 58 48 40

Fax +49 (5130) 58 48 11

www.klein-hummel.com

Printed 08/06 518283

Klein + Hummel 0300 D Installation And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual