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THX certified and not certified Dolby Digital/DTS Receivers also include Crossover
Frequency Controls to set at different low frequencies the roll off point of the signal led to
the subwoofer.
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Set the Operation M
Mode on your THX-SUB subwoofer to THX position if you have a THX
amplifier or to VAR position if not. The VAR position offers independent control of the
subwoofer's volume through the rotating switch at the rear side of it.
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Set the Phase switch of you THX-SUB to Normal position.
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Proceed to the Surround SSetup on your Receiver "Menu" to calibrate the channel llevel,
delay and size. In many systems delay calibration is taking place in m (meters from the
hearing position). For further details consult your amplifier's manual.
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Adjust the crossover frequency between 120Hz and 150Hz on the Crossover FFrequency
Control of your Receiver. Setting the crossover frequency at 120Hz ensures better perf
ormance of the Subwoofer making it more flexible to place in different locations in your
room. Setting the crossover frequency at 150Hz ensures bigger output power with the
restriction that the subwoofer is placed near the speakers.
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The adjustment of crossover frequency is taking place through a technique that is
called bi-amplification, resulting in the improvement of the frequency response of a home
cinema. Additionally bi-amplification lowers the signal distortion and increases the
dynamic area. Through that technique, the lower frequencies are being amplified exclu
sively by the built-in subwoofer's amplifier.
Notee: For further details according to the proper adjustments and placement of THX-SUB in
space, please refer to the subwoofer's manual.
ManualEnglish.qxd 13/04/2005 16:40 Page 9
