System Optimization - REVELL Performa B15 Owner's Manual

IMPORTANT

SYSTEM OPTIMIZATION

The REVEL PERFORMA B15 subwoofer includes a built-in
3-band parametric equalizer for use with sound measurement
equipment having at least
Do not use crude measurement devices, such as real-time or
1 ⁄
-octave analyzers, to measure low frequency performance in
3
a listening room. Room boundaries often cause modes or
standing waves with very narrow-band peaks and dips that are
beyond this equipment's measurement-resolution capability.
Adjusting the parametric equalizer based on this data can
result in very misleading results and degraded sound quality.
PLACEMENT OVERVIEW
Below 300 Hz, the relationship of loudspeaker placement and
listener location has a profound impact on the way sound is repro-
duced. All rooms have "standing waves," where certain frequencies
are emphasized or diminished. Their complex patterns, along with
the effect of surfaces near the loudspeakers or listeners, can combine
to introduce tremendous sound coloration at low frequencies.
Revel's unique parametric equalization system offers a powerful
tool to help compensate for these effects. However, no electronic
system alone can fully compensate for the dramatic effects of room
acoustics. Every room will have locations where "nulls" at specific
frequencies occur. These cancellations of the sound are like "black
holes," which no amount of equalization can fill.
The best results are always achieved through careful placement of
both the loudspeakers and the listening position. Optimum place-
ment can be determined through the use of computer modeling
programs, or by trial-and-error measurements. If at all possible,
find the best loudspeaker and listener locations before proceeding
with adjustments of the Revel parametric equalizer.
To help determine good locations for the subwoofer(s) and the lis-
tener(s), we recommend making high-resolution in-room response
measurements using the REVEL LOW FREQUENCY OPTI-
MIZER (LFO). This system provides the high-resolution data
needed for useful low-frequency measurements. Traditional real-
time analyzers (RTAs) or
resolution, often resulting in misleading data and degraded sound
quality. Simply use the REVEL LFO test signals disc and the
LOW FREQUENCY OPTIMIZER will plot the results of the
measurement at each speaker or listener (microphone) location.
1 ⁄
-octave resolution at 20 Hz.
10
1
⁄ -octave measurements have inadequate
3
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REVEL PERFORMA B15
Owner's Manual
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