Manual Controls - KEF Q400b Installationshandbuch

English instructions
Controls and sockets
Q400b Subwoofer Rear Panel
1. LFE / Line in Smart Connect input
2. Phase control
3. Bass boost
4. Level control
5. Mains indicator light
6. Crossover frequency control
7. 'ON/OFF' switch
(Vacation switch)
8. AC power input (230V Euro / 230V UK / 115V US)
9. High Level (Speaker) Input Block
Positioning
As the sub-bass (low frequency) sound produced by the subwoofer is non-
directional it can be positioned almost anywhere in the room, although it
should not be placed too close to the listener. For optimum performance
try the subwoofer in different positions to find the best place for a boom-
free sound.
Connection to AV amplifier / receiver
Connect to the amplifier LFE subwoofer output.
All inputs work simultaneously.
Set the subwoofer frequency on the amplifier / receiver to 80Hz (refer to
the amplifier / receiver manual).
Set the crossover on the Q400b to 140Hz.
Set the volume on the Q400b to the 7th dot.
Ensure that the satellites are set to the appropriate configuration in the
amplifier / receiver menu (refer to the speaker manual).
Adjust the subwoofer volume on the AV amplifier / receiver to your desired
level (refer to the amplifier / receiver manual).
Connection to stereo preamp / receiver
Connect to amplifier speaker or preamp or subwoofer output.
Set the crossover to 80Hz for large speakers or higher to match small
speakers. Start with the volume set at the 7th dot. Adjust the volume to
match output to your main speakers.
Trouble Shooting
FAULT
Mains indicator light does not come on.
Mains indicator light is on but no sound comes from
the subwoofer.
If there is still no sound.
Red light no sound.
Green light no sound.
Q400b manual_Iss1_4301-7382+0_20100622.indd 15
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Power ON Power OFF
Red / Green
REMEDY
Check that the subwoofer is plugged into the mains supply and that any switches are on.
Check any fuses (including the plug) or circuit breakers on the mains supply which may affect the
power to the subwoofer.
Ensure that all equipment is switched on.
Contact your dealer for further advice.
Check and adjust the level control.
Check the output sockets on the source equipment are correctly switched and
adjusted to provide sufficient level to drive the subwoofer.
Check that all connections between the subwoofer and the source equipment are
correct and adjust as necessary.
Contact your dealer for further advice.
Check volume levels of subwoofer and amplifier/receiver.

Manual controls

It is possible to manually adjust the set up of the Q400b instead of using the
amplifier / receiver.
A. Crossover Frequency Control
The crossover frequency control changes the upper cut-off frequency of the
subwoofer. Its effective range is from 40Hz to 140Hz at a rate of 24dB per
octave. The frequency control should be adjusted to achieve the smoothest
integration between the main/satellite speakers and the
subwoofer. Clockwise rotation will increase the cut-off frequency and anti-
clockwise rotation will decrease the cut-off frequency.
Combined Output Subwoofer Output
1. Ideal crossover - flat response.
2. Crossover point set too low - causes dip in combined response.
3. Crossover point set too high - causes hump in combined response.
B. Phase Control
The phase control will normally be set at 0º but more output level can
sometimes be achieved in the 180º position, particularly when the subwoofer
is far away from the satellite speakers.
C. Volume Control
The volume control adjusts the output level of the subwoofer in relation to
the satellite or AV speaker output level. Clockwise rotation to increase the
output level or anti-clockwise to decrease the output level.
Bass Boost (EQ)
The bass boost control is intended to adjust the response of the subwoofer
to compensate for room conditions and user preferences. Boost is
switchable between 0, +6 and +12dB at around 40Hz.
GB
Satellite Output
15
2010-6-22 13:19:38