Genelec 7040APM Users Manual

7040A

Operating Manual

Genelec 7040A
Active Subwoofer

Genelec 7040A Active Subwoofer

Introduction

Congratulation and thank you for choosing

Genelec!

Since 1978, Genelec has been guided by

a single idea – to make perfect active moni-

tors that deliver neutral and accurate sound

in every kind of acoustical environment.

In Genelec’s quest for this ultimate goal,

our unrivalled commitment to research

and development has led us to continu-

ously develop innovative driver technol-

ogy, electronic circuitry, enclosure designs

and many more. Our design philosophy is

based on sustainability and environmental

values, where industrial design serves our

product acoustical performance.

Your Genelec product has been designed

and manufactured with care in our factory,

in Finland, using environmentally ecient

solutions to give you reliable operation

over many years.

Please take the time to read this manual.

Happy monitoring!

General Description

The Genelec 7040A is a very compact

active subwoofer for reproducing low fre-

quencies. The 7040A extends the bass

reproduction of Genelec 8010, 8020 and

M030 active monitors for stereo applica-

tions. Using the 7040A extends their fre-

quency responses down to 30 Hz (-6 dB).

Driver

The 7040A contains one 165 mm (6.5

in) magnetically shielded driver, housed

in Genelec Laminar Spiral EnclosureTM

(LSETM).

Bass Management

Balanced XLR connectors are used for the

audio inputs and outputs. There are two

input connectors and two outputs.

The bass management unit in the 7040A

subwoofer splits the input into low and high

frequency components at 85 Hz. Frequen-

cies below 85 Hz are reproduced by the

subwoofer. Frequencies above 85 Hz are

directed via the subwoofer's output connec-

tors to the main monitors. The subwoofer's

outputs have the same level as the inputs.

The sub

adjusted from +12 to -6 dBu to match the

subwoofer sound level easily with dierent

monitors.

Two "BASS ROLL-OFF" switches pro-

vide bass response adjustment to compen-

sate for the acoustical environment in three

2 dB steps. Two switches allow alignment

of subwoofer phase with the monitors. The

woofer sensitivity can be

phase can be adjusted in 90 degree incre-

ments between 0° and -270°.

Amplifier

A Class D power amplifier produces 50

W output power with very low THD and

IM distortions. Driver overload protection

is included in the amplier circuitry. The

amplier also incorporates thermal over-

load and short circuit protections. The

power supply accepts mains voltages from

100 to 240 VAC.

ISSTM Autostart

The 7040A is equipped with Intelligent

Signal SensingTM (ISSTM) automatic start

function. ISS turns the amplier to standby

mode if no input signal has been detected

for one hour. The power consumption in

standby mode is less than 0.5 watts. Play-

back automatically resumes once an input

signal is detected.

There is a slight delay in the automatic

powering up. In those environments where

the 7040A is required to be on all of the

time, the ISS function can be disabled by

setting the “ISS DISABLE” switch to the

“ON” position. Then the subwoofer is con-

tinuously powered and can be turned o

using the power switch on the connector

>110 cm (43 in)

7040A ACTIVE SUBWOOFER

SWITCHES

SIGNAL INPUT

MAGNETICALLY SHIELDED

CONNECTORS

LEFT IN

RIGHT IN

SIGNAL OUTPUT

CONNECTORS

LEFT OUT

Figure 1. 7040A's amplifier panel, connectors and controls.

RIGHT OUT

SERIAL
NUMBER

ROLL-OFF

0

+3

+6

-6

+12

dBu

SENSITIVITY

FOR 100 dB

SPL @1m

www.genelec.com

MADE IN FINLAND

BASS ROLL-OFF
PHASE AND

-4 dB

-2 dB

-270°

-90°

-180°

ISS-DISABLE

-3

-4

ON

POWER

ISS DISABLE

MAINS INPUT

MAINSINPUT

50 /60Hz70W

100 - 240 V~

POWER SWITCH

panel. The default position from the factory

is with "ISS DISABLE" in the OFF position.

Installation

The subwoofer is supplied with a mains

cable and this operating manual. After

unpacking inspect the subwoofer for pos-

sible damage in transport. Ensure that the

subwoofer and the monitors are powered

o before connecting cables.

Audio connections to the subwoofer

and monitors use balanced XLR cables

(not included in the subwoofer delivery

content). As the 7040A has an integrated

amplier, it may only be connected to a

line level signal source, such as a mixing

console or preamplier, never to the loud-

speaker outputs of a power amplier or an

integrated amplier.

The source is connected to the "LEFT

IN" and "RIGHT IN" connectors of the

subwoofer. The subwoofer’s output con-

nectors "LEFT OUT" and "RIGHT OUT" are

connected to the monitors.

If the signal source has unbalanced

RCA outputs, you can use signal cables as

shown in Figure 2.

Once all connections have been made,

the subwoofer and monitors can be pow-

ered up.

Positioning In The Room

Placement of the subwoofer in the room

aects the subwoofer frequency response

and sound level dramatically, as the room

influences the low frequencies strongly.

Even a slight change in the subwoofer's

location can make a marked dierence in

the frequency balance. Often patient and

methodical experimentation is needed to

nd the optimum placement. The placement

will also aect the phase alignment between

the monitors and the subwoofer, as well as

the need for bass roll-o adjustment.

First, place the subwoofer slightly oset

from the center of the front wall. The dis-

tance to the nearest wall should be less

than 0.6 m (24 in) measured from the sub-

woofer's driver. This position increases

acoustic loading and sound output due to

the proximity of the wall and oor. Too large

a distance from the wall can cause cancel-

lations and reduce subwoofer output. The

monitor should be placed at least 1.1 m (43

in) away from walls to avoid reduction of

low frequency output (see Figure 3).

If the subwoofer frequency response does

not seem balanced, move the subwoofer

slightly to the left or right. This changes

how the room modes are excited and can

Figure 2. XLR to RCA connector for
connecting to an unbalanced signal source.

Main
monitor

<60cm (24 in)

Figure 3. Recommended distances to
the front wall

Phase Difference: 0°

Phase Difference: 270°

Phase Difference: 90°

OFF

OFF

OFF

Subwoofer placement Bass Roll-Off

setting

Near to a wall -2 dB

In a corner -6 dB

Flush mounted -2 dB

Table 1. Suggested Bass Roll-Off settings

85 Hz

Phase Difference: 180°

85 Hz

Figure 4. The effect of phase difference between the subwoofer and the main loudspeakers

result in improved atness. Positioning the

subwoofer close to a corner boosts the

subwoofer output but may cause asymmet-

rical spatial imaging at low frequencies.

Operating Environment

The 7040A subwoofer is designed for

indoor use only. The ambient temperature

should be 15-35 °C (50-95 °F) and the rel-

ative humidity 20-80 %. Condensation is

not allowed. If it has been stored or trans-

ported in a cool environment, the product

must be allowed to warm up in its packing

to the ambient temperature before con-

necting mains power.

Sufficient amplifier cooling and reflex

port functioning is required when the

subwoofer is installed in a restricted space,

such as a cabinet or integrated into a wall

structure. See section “Flush Mounting the

Subwoofer.” A restricted space must be

suciently ventilated to prevent ambient

temperature rise above 35 °C (95 °F).

Do not cover the driver of the subwoofer.

Do not place the subwoofer so that there is

less than 10 cm (4 in) of free space in front

of the grille.

Thick carpets under the subwoofer can

block the ventilation clearance needed for

cooling the amplier unit. To ensure proper

85 Hz

85 Hz

functioning of the reflex port the reflex

port side (opposite of the connector panel)

should have a minimum clearance of 7.5 cm

(3 in).

Flush Mounting the

Subwoofer

If the subwoofer is flush mounted into a

wall or a cabinet, ensure amplier cooling

and unrestricted airow from the reex port.

Make the recess 7.5 cm (3 in) wider than the

subwoofer. Place the subwoofer into the

right end of the recess with the driver side

facing the room. This leaves sucient 7.5

cm (3 in) of free space for the reex port.

The height and depth of the recess should

not be much larger than the subwoofer.

Setting the Input Sensitivity

The 7040A has the same sensitivity as 8010,

8020 and M030 monitors in free eld. How-

ever, when placed near reecting surfaces

the sensitivity of 7040A typically must be

attenuated due to increased wall loading.

A typical initial setting for the rotary sensi-

tivity control is -4 dBu. The +12 dBu setting

provides maximum attenuation The use of

proper measuring equipment with careful

listening is highly recommended.

Figure 5. Flush mounting the subwoofer.
Note the clearance needed on the reflex
port side.

Phase Alignment by

Listening

Connect an audio frequency signal gener-

ator to LEFT IN or RIGHT IN input of the

7040A and feed in an 85 Hz tone. Connect

a monitor to the corresponding output, so

that the test signal is reproduced by both

subwoofer and monitor.

Toggle the -180°

ON

phase switch (DIP 4

from left) "ON" and

"OFF". Set it to the

position giving the

lowest sound level at the listening position.

Next, toggle the -90°

ON

phase switch (DIP 3)

"ON" and "OFF", and

again set it to the posi-

tion which gives the

lowest sound level.

Finally, invert the -180°

ON

phase switch (DIP 4)

position to the oppo-

site setting. Now you

can remove the test

signal.

Phase Alignment Using Test

10

200

20

30

50

100

Hz

10

200

20

30

50

100

Hz

Equipment

Feed in the test signal to LEFT IN or RIGHT

IN of the subwoofer. Place the microphone

at the listening position. Using a real-time

analyser or other frequency response

measurement system, adjust the sensitiv-

ity of the subwoofer until the frequencies

below and above 85 Hz are reproduced

at equal level. Then, adjust the phase

switches for the maximum dip of at least

-6 dB at the crossover frequency (85 Hz).

Invert the -180° switch to the opposite

setting. The phase is now aligned and

the measurement should show a smooth

response around 85 Hz.

Setting the Bass Roll-Off

The acoustic response of the subwoofer

can compensate the room character-

istics. To adjust the subwoofer use the

''Bass Roll-O' switches located on the

connector panel. These oer attenuation

levels of -2, -4, and -6 dB at the lowest

subwoofer output frequencies. Table 1

provides suggestions for Bass Roll-O

switch settings. Flat anechoic response

is obtained when both roll-o switches

are set to "OFF".

Safety Considerations

Genelec 7040A subwoofer has been

designed in accordance with interna-

tional safety standards. However, to

ensure safe operation and maintain the

unit in safe operating condition, the fol-

lowing warnings and cautions must be

observed:

• Do not expose the subwoofer to water

or moisture. Do not place any objects

lled with liquid, such as vases on the

subwoofer or near it.

• Servicing and adjustment must only be

performed by authorized Genelec ser-

vice personnel.

• Opening the amplifier unit is strictly

prohibited except by authorized ser-

vice personnel.

• Always use a mains power connection

with protective earth terminal. In case

of fault, failing to do this may lead to

personal injury.

Warning!

This equipment is capable of delivering

sound pressure levels in excess of 85

dB, which may cause permanent hearing

damage.

Maintenance

No user serviceable parts are inside the

amplifier unit. Any maintenance of the

unit must only be performed by Genelec

authorized service personnel.

Guarantee

This product is supplied with a two year

guarantee against manufacturing faults or

defects that might alter the performance.

The guarantee can be extended to five

years by registering the product on www.

genelec.com. Refer to the supplier for full

sales and guarantee terms.

Compliance to FCC rules

This device complies with part 15 of the

FCC Rules. Operation is subject to the fol-

lowing conditions:

• This device may not cause harmful

interference, and this device must

accept any interference received,

including interference that may cause

undesired operation.

Note: This equipment has been tested and

found to comply with the limits for a Class

B digital device, pursuant to part 15 of

the FCC Rules. These limits are designed

to provide reasonable protection against

harmful interference in a residential instal-

lation. This equipment generates, uses and

can radiate radio frequency energy and, if

not installed and used in accordance with

the instructions, may cause harmful inter-

ference to radio communications. How-

ever, there is no guarantee that interference

will not occur in a particular installation. If

this equipment does cause harmful inter-

ference to radio or television reception,

which can be determined by turning the

equipment o and on, the user is encour-

aged to try to correct the interference by

one or more of the following measures:

• Reorient or relocate the receiving

antenna.

• Increase the separation between the

equipment and receiver.

Frequency response 7040A 25.3.15

+100

+80

dB SPL

+60

+40

+20

+0

Figure 6. The free field frequency
response of the 7040A subwoofer at
different Bass Roll-Off settings

Harmonicdistortion 7040A 25.3.15

+100

+80

dB SPL

+60

+40

+20

+0

Figure 7. The curves above show the
harmonic distortion analysis of the
7040A in free field. In half space the SPL
will be 6 dB higher.

Fundamental
frequency

3rd harmonic

2nd harmonic

• Connect the equipment into an outlet

on a circuit dierent from that to which

the receiver is connected.

• Consult the dealer or an experienced

radio/TV technician for help.

Modications not expressly approved by

the manufacturer could void the user’s

authority to operate the equipment under

FCC rules.

7040A Operating Manual

SYSTEM SPECIFICATIONS

7040A

Free eld frequency response (-6 dB) 30...90 Hz

Accuracy of frequency response ± 3 dB (33...85 Hz)

Maximum short term sine wave SPL output

100 dB
averaged from 40 to 85 Hz, measured in half
space at 1 meter

Self generated noise level in half space at

≤ 5 dB

1 m (A-weighted)

Harmonic distortion at 90 dB SPL
at 1 m on axis in half space 40…85 Hz

2nd
3rd

Driver, magnetically shielded 165 mm (6

≤ 2.5%

≤ 1.5 %

1

/2 in)

Weight 11.3 kg (24.9 lb)

Dimensions

Height
Width
Depth

410 mm (16

350 mm (13

205 mm (8

1

/8 in)

3

/4 in)

1

/16 in)

CROSSOVER SECTION

7040A

Subsonic lter (18 dB/octave) below 35 Hz

Input channels 2

Low pass frequency for main channels 85 Hz

Midband rejection >400 Hz ≥ 50 dB

Bass Roll-O control in 2 dB steps 0 to -6 dB @ 35 Hz

Phase matching control in 90° steps 0 to -270°

Input sensitivity control +12 to -6 dBu

AMPLIFIER SECTION

7040A

Amplier short term output power

50 W
(Long term output power is limited by driver
unit protection circuitry)

Amplier system THD at nominal output ≤ 0.08 %

Mains voltage 100 - 240 VAC universal

Power consumption (average)

Standby (ISS active)
Idle
Full output

≤ 0.5 W

5 W

70 W

INPUT SECTION

7040A

Input connectors XLR female
pin 1
pin 2
pin 3

gnd
+

-

Input impedance 10 kohm balanced

Input level for 100 dB SPL output @ 1 m Variable from +12 to -6

dBu

OUTPUT SECTION

7040A

Input connectors XLR male
pin 1
pin 2
pin 3

Main monitor Out gain 0 dB

gnd
+

-

Genelec Document D0126R001 Copyright Genelec Oy 3.2015. All data subject to change without prior notice

International enquiries:

Genelec, Olvitie 5

FIN-74100, Iisalmi, Finland

Phone [phone]

Fax [phone]

Email [e-mail]

In the U.S. please contact:

Genelec, Inc., 7 Tech Circle

Natick, MA 01760, USA

Phone [phone]

Fax [phone]

Email [e-mail]

In China please contact:

Beijing Genelec Audio Co.Ltd

Room 101, 1st oor, Building 71 B33

Universal Business Park, No. 10 Jiuxianqiao Road

Chaoyang District, Beijing, China

Phone [phone]

Post code: 100015

Email [e-mail]

www.genelec.com

In Sweden please contact

Genelec Sverige

Ellipsvägen 10B

P.O. Box 5521, S-141 05 Huddinge

Phone [phone]

Fax [phone]

Email [e-mail]