Using Multiple Subwoofers - Genelec F Two Operating Manual

Coarse Phase Correction
Method
Connect an audio frequency signal gen-
erator to a signal input on the subwoofer
which has a main loudspeaker connected
to the corresponding "OUT" connector.
If the loudspeakers are placed at differ-
ent distances from the listening position,
choose the loudspeaker that is nearer.
Set the generator to 85 Hz. If a signal
generator is not available, it is possible to
use an audio test recording which has a
test frequency in the range 70 Hz to 100 Hz.
Suitable test signals can be downloaded
at www.genelec.com and found in some
smart phones.
Toggle the -180° phase
OFF
switch 'ON' and 'OFF' and
ON
90°
set it to the position which
180°
270°
gives the lowest sound
PHASE
level at the listening posi-
tion.
Next toggle the -90°phase
OFF
switch 'ON' and 'OFF',
ON
and again set it to the
90°
180°
270°
position which gives the
PHASE
lowest sound level.
Finally, set the -180°phase
OFF
switch to the opposite set-
ON
90°
ting.
180°
270°
PHASE
Matching IR Remote
Controls
The F Two subwoofer can be used with
most IR remote controls, providing con-
venient use with, for instance, the remote
control of a TV set when connected to it
via a fixed level digital signal input. Turn the
subwoofer upside down so you can easily
reach the "Select" button on the subwoof-
er's connector and the status indicator LED
on the subwoofer's foot is visible. The IR
receiver is located in the LED. Note that the
"Select" buttons on the RF remote control
provided with the subwoofer do not actu-
ate the matching.
The matching procedure is as follows:
• Keep the "Select" button on the
subwoofer depressed until the status
indicator LED starts blinking red.
• Choose the button on the remote
control that you want to actuate "volume
up" function. Keep it depressed until the
LED stops blinking. With some remote
controls pressing the button multiple
times works better.
• Now the LED blinks green, indicating
that the button for "volume down" can be
selected. Follow the procedure described
above.
• Next the LED blinks blue for selection of
the button for "Select" button.
• Yellow LED indicates the selection of
"Mute" button.
• Magenta LED indicates the selection of
"Power" button.
A short press on the "Select" button allows
you to skip a step in the procedure, if you
do not want to "teach" all the commands
listed above. If you want to interrupt the
procedure, press "Select" for approxi-
mately two seconds. This saves the set-
tings made so far. If you don't want to
save the settings, press the Power button
for two seconds. This will also delete the
matching settings done by that point. If you
want to change the matched buttons, just
redo the matching process.
Matching The RF Remote
Control To The Subwoofer
The remote controls delivered with F Two
subwoofers will function with any other F Two
subwoofer as well. If this is not desirable, for
instance when there are several F Two sub-
woofers in the same premises, and the user
wishes to avoid the situation that more than
one subwoofer reacts to the commands
given by each remote control, the remote
controls can be matched to operate only one
subwoofer.
1. Press and hold down the "Power" and
"Select " buttons on the subwoofer until
the LED starts blinking white.
2. While the LED is blinking, first press
and hold down the volume "+" button on
the remote control and then the volume "-"
button. Keep both buttons pressed for a
few seconds until the status indicator LED
on the subwoofer stops blinking. This indi-
cates that matching is completed and the
matching operation ends automatically.
Now the subwoofer should only respond
to commands given by the matched remote
control, and respectively, the matched
remote control should not work with other
F Two units. For cancelling the match-
ing operation while the LED is blinking,
press and hold down the "Power" button
on the subwoofer for two seconds. If you
wish to undo a matching completely, press
and hold down the "Power" button on the
subwoofer for ten seconds.
NOTE: In some cases the local WiFi
network can cause problems with the RF
remote control, if they operate on the same
wavelength. We recommend the use of an
IR remote control in these cases.

Using Multiple Subwoofers

The Genelec F Two subwoofer is equipped
with an LFE/LINK output connector to pro-
vide an easy way of coupling two or more
subwoofers together in high SPL applica-
tions, for instance when using the subwoof-
ers with Genelec G Four active loudspeak-
ers. Connected as described below, the
"master" subwoofer controls the volume
of all subwoofers linked to it through this
connector.
Connect an RCA cable from the LINK
connector of the "master" subwoofer to
which the main loudspeakers are con-
nected, to the LFE / LINK connector of
the other, "slave" subwoofer and turn the
LINK dip switch on the "slave" subwoofer
to "ON".
In the LINK mode, the subwoofer volume
is automatically set to maximum and the
"slave" subwoofer only reacts to the power
on/off commands given with a remote
control. It follows the volume adjustment
and source channel selection done in the
"master" subwoofer.
When two subwoofers connected in this
way are positioned close to one another,
bass level increases by 6 dB. Three sub-
woofers give an SPL increase of 9.5 dB
and four subwoofers 12 dB compared to a
single subwoofer.
The rotary "SUBWOOFER LEVEL" adjust-
ment knob should be set in the same posi-
tion as that of the "master" subwoofer
unless the subwoofers are placed in very
different positions acoustically, for example
one in a corner and one far from corners.
In such case, it is advisable to measure the
loudness of each subwoofer separately and
adjust them individually for correct balance.
Phase and Bass Roll-Off adjustments
should be done individually for each
subwoofer in the chain, especially if they are
not placed close together. To check the phase
alignment for the "master" subwoofer switch
off the "slave" subwoofer and follow the
instructions given in the previous sections.