Turning Subwoofer On/Off; Adjusting The Low Pass Filter; Setting The Subwoofer Phase; Setting The Subwoofer System - Alpine CDE-HD137BT Owner's Manual

Turning Subwoofer ON/OFF

When the subwoofer is on, you can adjust the subwoofer output level
(refer to "Adjusting Subwoofer Level/Bass Level/Middle Level/Treble
Level/Balance (Between Left and Right)/Fader (Between Front and
Rear)/Loudness/Defeat" on page 16).
 Setting item: SUBWOOFER
Setting contents:
SUBW OFF / SUBW ON (Initial setting)
SUBW OFF:
No subwoofer signal is output from the Subwoofer RCA
Connectors (refer to "Connections" on page 50).
SUBW ON:
The subwoofer signal is output from the Subwoofer RCA
Connectors (refer to "Connections" on page 50).

Adjusting the Low Pass Filter

The Low Pass Filter on this unit can be adjusted to suit your personal
taste.
 Setting item: SUBW LPF
Setting contents:
LPF OFF (Initial setting) / LPF 60 (Hz) / LPF 80 (Hz) /
LPF 120 (Hz) / LPF 160 (Hz)
All frequencies lower than the selected cutoff are output.

Setting the Subwoofer Phase

The subwoofer output phase is toggled between SUBWOOFER
NORMAL (0°) and SUBWOOFER REVERSE (180°). Depending on the
installation location of your subwoofer, one of these settings may sound
better than the other.
 Setting item: SUBW PHASE
Setting contents:
NORMAL (Initial setting) / REVERSE

Setting the Subwoofer System

When the subwoofer is on, you can select either SYS 1 or SYS 2 for the
desired subwoofer effect.
 Setting item: SUBW SYS
Setting contents:
SUBW SYS 1 / SUBW SYS 2 (Initial setting)
SUBW SYS 1:
Subwoofer level changes according to the main volume setting.
SUBW SYS 2:
Subwoofer level change is different from the main volume setting.
For example, even at low volume settings, the subwoofer is still
audible.
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External Device

Connecting to an External Amplifier (POWER IC)

When the internal amplifier is not being used, sound quality can be
improved by turning off its power supply.
 Setting item: POWER IC
Setting contents:
OFF / ON (Initial setting)
OFF:
Use this mode when the line output of this unit is used to drive an
external amplifier. In this setting, the head unit's internal amplifier
is turned OFF and cannot drive speakers.
ON:
The speakers are driven by the built-in amplifier.
OFF:
Amplifier
Amplifier
ON:
SPEAKER
RIGHT FRONT
SPEAKER
RIGHT REAR
SPEAKER
LEFT REAR
SPEAKER
LEFT FRONT
Note
• No sound is produced by the system when the power output is set to
OFF.
Front
Left
Front
Right
Rear
Left
Rear
Right
Speakers
Front
Right
Rear
Right
Rear
Left
Front
Left