any possible mismatch and resulting cancellation between the subwoofer and your main speak-
ers/ amplifier. To adjust, simply listen to the system with music playing then depress the phase
switch from one position to the other and listen for a change in low frequency output. The correct
position will have a greater amount of apparent low frequency output.
For all installations, experiment with the phase switch to determine the setting that produces the
most bass. If the settings sound similar we recommend the 0° position.
5.4 Var / THX
Operational Mode Switch • THX or Variable positions
• For one TX-12SUB Subwoofer
> Meets all required specifications for THX Ultra2 Certification but amplifier gain is 12dB lower
VAR (Variable) position:
The TX-12SUB operates under THX specifications except for the internal amplifier's gain.
You can change the output level in Variable mode with the Volume Control knob
5.5 Auto On / Off
The subwoofer will turn itself on automatically when an audio signal is present. If no signal is pres-
ent for approximately 10 minutes, the unit will switch to standby mode. While in standby mode your
subwoofer will draw minimal power, however we suggest you turn it off or even unplug the power
cord from the outlet when it is left unused for a long period of time.
Figure 4: Subwoofer Control layout
CRYSTAL ACOUSTICS THX ULTRA2 CERTIFIED SPEAKERS
1. POWER ON / OFF
(always on standby when ON)
2. VOLUME CONTROL
3. PHASE SWITCH
4. MODE SWITCH
(for THX and VAR)
(for THX and V A R)
5. HEAT SINK
6. LOW LEVEL INPUT