10
11. BASS LEVEL REFERENCE
Use THX Fixed Bass Level Reference for X10 & X12 when the subs is connected to THX
approved surround receivers or processors.
The built-in bass management level adjustment in THX approved surround receivers or
processors will accordingly supply the sub with input gain to match the overall system volume
adjustment.
X8 sub can as well use the “fixed level position” for bass management control by receiver or
processor.
Set switch to “Variable” to activate adjustable Bass level reference volume control.
For all X sub models the variable level control add +20dB gain at max position.
Use a Sound Level Meter. (A good quality, inexpensive analog meter – model # 33-4050 - is
available from Radio Shack stores or on their website,
www.
RadioShack
.com.
) Point it directly at
the speaker being measured. Set all channels to the same level, using your receiver or
processor’s internal test signal. Set the meter to “C” weighting and “Slow” response. Set the
levels to 75 dB if you have a THX processor or receiver or are using the Video Essentials disc as
a source for setting levels. (Note: some people prefer to set their subwoofers to 80 dB or even 85
dB with the satellites at 75 dB – this is a personal preference.)
