Genelec LSE 7071A, LSE 7070A, LSE 7060A User Manual

LSE Series

Operating Manual
Genelec 7060A, 7070A and 7071A

Active Subwoofers

7060A, 7070A and 7071A Active Subwoofers

General description

Genelec 7060A, 7070A and 7071A are pow­erful active subwoofers, incorporating all the
amplifi er and crossover electronics needed
for bass management and reproduction in
modern 6.1 or 5.1 channel surround sound
or traditional stereo systems. Their 19 to 120
Hz (±3 dB) (29 to 120 Hz on the 7060A) fre­quency range, ample sound pressure capa­bility and versatile connections make these
subwoofers ideal companions for Genelec's
active monitoring speakers.

Bass management unit

The built-in bass management unit has six
signal input and output channels (L/C/R Front
and L/C/R Rear), a discrete LFE signal input
and a summed signal output, providing great
fl exibility and easy connection in all monitor­ing environments.

The active crossover contained in the bass
management unit splits the input signals into
low and high frequency components at 85
Hz. Frequencies below 85 Hz are directed to
the subwoofer and frequencies above 85 Hz
to the main speakers.

The low pass section sensitivity can be
adjusted from +12 dBu to -6 dBu to allow

easy subwoofer level matching with various
main speakers. All outputs have 0 dB pass­band gain.

The low pass frequency of the LFE input
channel can be set to 85 Hz, 120 Hz or 85 Hz
with "Redirect" function that routes LFE con-

tent above 85 Hz to the front center monitor.
The input sensitivity of the LFE channel can
be set to 0 dB or +10 dB.

Balanced XLR connectors are used for the
system audio inputs and outputs.

Two "Bass Roll-Off" switches are included
to provide a fl at bass response in all acous-
tical environments, enabling adjustments of
the subwoofer response in three -2 dB steps.
Two phase matching switches in the crosso­ver allow compensation for the delay which
occurs if the subwoofer is placed away from
the main speakers, or for other speaker sys­tems phase behaviour. Four settings are pro­vided between 0° and -270°. An 85 Hz test
tone generator is included to help achieve
accurate crossover phase alignment.

Installation

Each subwoofer is supplied with a mains cable
and an operating manual. Once unpacked,
place the subwoofer in a suitable location (f or
more details see the "Positioning" section).

Before connecting the audio signals, ensure
that both the subwoofer and the main moni­tors are switched off. Check that the voltage
selector switch is set according to your local
mains voltage (subwoofers sold in Europe
have a fi xed 230V setting). Connections are
easier to make if you roll the subwoofer on
its side with the amplifi er panel facing up. Use
this position only for making the connections
and roll the subwoofer back to its normal
upright position before use. Audio connec­tions to the subwoofer are made via balanced
XLR connectors. An unbalanced source can
also be used with a special RCA to XLR
cable; the correct connection for the cable is
shown in Fig. 2. Howev er , we recommend the
use of balanced cables and connectors due
to their better noise immunity . The connectors
are arranged in three rows on the amplifi er
panel (see Fig. 1):

Top row

LFE IN / SUM IN: Use this connector for
the LFE or .1 output channel of a 5.1- or

6.1-channel discrete surround sound source,
or the SUM OUT signal from the "master"
subwoofer in a daisy-chained multiple sub­woofer confi guration. Note that the "sub-
woofer out" channel of an analogue matrix
surround decoder (Dolby Surround, Dolby

Figure 2. XLR to RCA connector for
unbalanced operation.

Figure 1. 7070A's amplifier panel, connectors and controls.

Pro Logic) should not be connected to the
"LFE IN" input. See section "Subwoofer in
analogue matrix sound systems".

SUM OUT: Use this output connector when
you want to link another subwoofer to your
system. "SUM OUT" carries an unfi ltered
sum of signals combined from all input chan­nels. See section "Using multiple subwoof­ers".

Middle row

FRONT L, C, R CHANNELS IN/OUT: Use
these connectors for the Front Left, Center
and Right channels of a surround sound
system or the Left and Right channels of
a Stereo system. Connect line level signal
cables from your signal source to their respec­tive "LEFT IN", "CENTER IN" and "RIGHT IN"
connectors. Then connect the subwoofer to
your main monitors with XLR cables from the
"LEFT OUT", "CENTER OUT" and "RIGHT
OUT" connectors. All "L, C and R OUT" chan­nels are high pass fi ltered with the fi ltering
frquency fi xed at 85 Hz (12 dB/octave).

Bottom row

REAR L, C, R CHANNELS IN/OUT: Use
these connectors for the Rear Left, Center
and Right channels of a surround sound
system. The connection is made in the same

way as with the Front channels. Also these
channels are high pass fi ltered at 85 Hz.

subwoofer and main monitors are ready to be
powered up.

The placement of the subwoofer in the room
affects the overall frequency response and
sound level of the system dramatically, as at
low frequencies the effects of the room are
strong. Even a slight change in the subwoof­er's location can make a marked difference
in the frequency balance and often patient
and methodical experimentation and testing
is needed to fi nd the optimum placement.

difference between the main monitors and
the subwoofer , and also the bass roll-off rate .
These effects can be compensated by the
use of the controls in the amplifi er unit;
but we recommend that at fi rst you leave
the switches untouched and concentrate on
fi nding the position where the subwoofer
gives the smoothest response, and only then
use the controls to fi ne-tune the balance and
phase alignment between the subwoofer and
the main monitors.

Once all connections have been made, the

Positioning in the room

The placement will affect the phase

To begin with, place the subwoofer slightly

Figure 3. Recommended distances to
the front wall

offset from the center of the front wall.
The recommended distance to the wall is
less than 60 cm / 24" measured from the
subwoofer's driver (See Fig. 3). This position
gives increased acoustic loading (and SPL)
due to the proximity of the front wall and fl oor .
Cancellations from the front wall and fl oor are
also avoided. Front wall cancellation for the
85 Hz high pass fi ltered main speakers
can be eliminated by placing them at least
110 cm / 43" away from the front wall. In
a multichannel system the main monitors
should ideally be positioned symmetrically
and at an equal distance from the listening
position.

If the frequency balance is not right, try
moving the subwoofer slightly to the left or
right so that different room modes are
excited at different levels. Positioning the
subwoofer close to a corner will boost the
bass level at lower frequencies and may
cause asymmetrical spatial imaging. If you
are using two subwoofers, try placing them
asymmetrically relative to the side walls.
Sometimes moving the subwoofers apart
into the front corners helps with problematic
rear wall refl ections and the loss of mutual
coupling is compensated by the bass boost
caused by corner positioning.