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7
Subwoofer Controls and Connections
BDS
Subwoofer Controls and Connections
Phase Switch: This switch determines whether the subwoofer driver’s piston-like
action moves in and out in phase with the satellite speakers. If the subwoofer were
to play out of phase with the satellite speakers, the sound waves produced by the
subwoofer could be cancelled out, reducing bass performance and sonic impact.
This phenomenon depends in part on the relative placement of all the speakers in
the room.
Although in most cases the Phase switch should be left in the “Normal” position,
there is no absolutely correct setting for it. When the subwoofer is properly in phase
with the satellite speakers, the sound will be clearer and have maximum impact.
It will make percussive sounds like drums, piano and plucked strings sound more
lifelike. The best way to set the Phase switch is to listen to music that you are familiar
with and set the switch in the position that gives drums and other percussive sounds
maximum impact.
Bass-Boost Switch: Set this switch to “On” to enhance the subwoofer’s low-
frequency performance. Set this switch to “Off” for normal low-frequency
performance.
Power-On Mode Switch: When this switch is set in the “Auto” position and when
the Power switch is set to “On,” the subwoofer will automatically turn itself on when
it receives an audio signal. It will enter the Standby mode if it receives no audio
signal for 20 minutes. When the Power-On Mode switch is set in the “On” position,
the subwoofer will remain on whether or not it is receiving an audio signal.
An LED on the subwoofer’s top panel indicates whether the subwoofer is in the On
or Standby mode:
s7HENTHE,%$GLOWSBLUETHESUBWOOFERISTURNEDON
s7HENTHE,%$ISNOTLITUPTHESUBWOOFERISIN3TANDBYMODE
When the Main Power Switch is set to Off, the LED will not light up, no matter what
setting the Power-On Mode switch is in.
Subwoofer Level Control: Use this control to adjust the subwoofer’s volume. Turn
clockwise to increase the volume; turn counterclockwise to decrease the volume.
External Trigger Input Connector: NOTE: This connector is NOT used with the
BDS receiver. If you connect the subwoofer to a different component that has a
voltage trigger output connection, connect the External Trigger Input to the trigger
output of the other compatible component. Whenever the subwoofer detects a
trigger signal between 3V and 30V (AC or DC), the subwoofer’s amplifier will turn
on. The subwoofer’s amplifier will turn off after the trigger signal ceases, even when
the Power-On Mode switch is in the “Auto” position.
Line-Level In LFE Connector: Use the supplied mono RCA audio cable (with the
purple connectors) to connect the Line-Level In LFE connector to the BDS receiver’s
Subwoofer output.
Line-Level In L/R Connectors: NOTE: These connectors are NOT used with the
BDS receiver. If you connect the subwoofer to a different receiver that does not
have a dedicated, low-pass-filtered subwoofer output, use these connectors.
If the receiver has a separate subwoofer output, use the supplied mono RCA
s
audio cable to connect the receiver or preamp/processor’s subwoofer output to
either one of the subwoofer’s Line-Level In L/R connectors.
If your receiver or preamp/processor does not have a separate subwoofer
s
output, use two Y-adapters (not supplied). Connect one adapter’s single end
to the unit’s preamp output for that channel. Connect one of this adapter’s
dual ends to the main amp input for that channel, and connect the adapter’s
other dual end to one of the subwoofer’s Line-Level In L/R connectors. Repeat
this process with the other Y-adapter, preamp channel, main amp input and
subwoofer’s Line-Level In L/R connector.
Main Power Switch: Set this switch in the On position to turn the subwoofer on.
The subwoofer will then either be on or in Standby mode, depending on the setting
of the subwoofer’s Power-On Mode switch.
Power Cord: After you have made and verified all subwoofer and speaker
connections described in this manual, plug the Power cord into an active, unswitched
electrical outlet for proper operation of the subwoofer. DO NOT plug this cord into
the accessory outlets found in some audio components.
PL0004-01001
Phase Switch
Bass-Boost Switch
Power-On Mode Switch
Subwoofer Level Control
External Trigger Input Connector
Line-Level In LFE Connector
Line-Level In L/R Connector
Power Switch
Power Cord
7


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