Anthem Audio D2 - Manual (Page 35)

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3. SETUP
continued …
Highlighting ROOM RESONANCE FILTER then pressing SELECT displays this menu:
Skip this menu if using Anthem Room Correction on all sources.
Rooms often have a single prominent resonance peak which can make bass sound boomy, even with the
finest subwoofer. The processor has a proprietary set of low frequency test tones that allow you to find and
easily remove that resonance peak.
The Room Resonance Filter is a notch filter – it is not designed to boost weaker bass frequencies. While
running the test tones, if you discover that instead of a prominent peak there is a prominent dip in response,
the best way to fill it is through repositioning the subwoofer and/or listening position. Using electronics alone
to accomplish this is often met with frustration, for example, a 10 dB boost would require the amplifier to
work ten times harder, as well as speakers that can handle that much more power.
Test Tone and Level:
Test tones sweep from 18 Hz up to the XOVER FREQ (or the SUB/LFE XOVER frequency) that you have set in
BASS MANAGEMENT -MOVIE or -MUSIC, whichever is higher. You can vary the level to a comfortable one.
Filter Center Frequency:
The frequency that is reduced the most when the filter is applied is called the Center Frequency. Set this to
the frequency that sounds the loudest or most boomy when the built-in test tones are played. If you’re using
a sound pressure level meter, set it to C-weighting or Flat.
Filter Depth:
This is the amount of center frequency ‘cut’, or reduction in volume, in the subwoofer channel. Frequencies
just above and just below the center frequency are also reduced, but not as much. Range is from 1 to 20 dB.
Adjust to bring the level of the resonant peak down to the same level as the other frequencies.
Filter Width:
This adjustment varies the range and sharpness of the filter. For example, if Filter Width is set to 3 Hz, the
Room Resonance Filter cuts a very narrow range at the filter center frequency. If Filter Width is changed to
18 Hz, a broader range is reduced. Adjust so that resulting frequency response is as flat as it can be made.
Frequency and Depth settings affect Width adjustment range – this changes automatically.
THX Boundary Gain Compensation:
If your listening room layout results in the subwoofer and/or listeners being too close to a wall, an excessive
bass effect can result. With a subwoofer that extends to 20 Hz, including all THX Ultra2 certified subwoofers,
Boundary Gain Compensation can improve bass balance. To enable, set THX ULTRA 2 SUB to Yes and THX
BG COMPENSATION to On.
ROOM RESONANCE
RESONANCE FILTER
RESULT
R
3h.ROOM RESONANCE FILTER
a. TEST TONE: Off
b. TEST LEVEL: +0.0dB
c. TEST FREQ: 21 Hz
d. APPLY FILTER: No
e. CENTER FREQ: 60 Hz
f. FILTER DEPTH: 1 dB
g. FILTER WIDTH: 20 Hz
h. THX ULTRA2 SUB: No
i.THX BG COMPENSAT'N: NA
Center Frequency
Filter Depth
Filter Width