REVELL Performa F52 Owner's Manual page 22

Specification
Sensitivity 87.5dB SPL with 2.83Vrms
@1 meter (4 pi anechoic)
Impedance • 6.5
• 3.5
Filter Network • Three-way, high-order
In-Room Response • ±0.5dB from 33Hz to
Target Response • ±0.5dB from 31Hz to
First Reflections • ±0.5dB from 33Hz to
Response
Listening Window • ±1.0dB from 38Hz to
Response
Low-Frequency • –10dB @ 23Hz
Extension
• –6dB @ 26Hz
• –3dB @ 37Hz
REVEL Performa F52
22
OWNER'S MANUAL
Value
Indicates the amount of power the associated power amplifier
must deliver to drive the loudspeaker at reasonable volume
levels. Conservatively-rated specifications indicate moderate
sensitivity, meaning that a massive power amplifier is not
required to drive Revel loudspeakers to reasonable volume
levels in large listening spaces.
(nominal) Indicates whether the loudspeaker presents a "difficult" or
"easy" load on the associated power amplifier. Combined
(minimum @
with moderate phase angles, a minimal impedance
373Hz)
specification of 3.5
amplifier to drive Revel loudspeakers.
Indicates the acoustical characteristics of the filter network.
acoustic response @ Steep filters indicate an optimized filter network that
200Hz and 2.3kHz produces minimal acoustical interference, low distortion,
and expansive dynamic range. Revel's filter networks
are mounted on printed circuit boards with carefully selected
components. Woofer, midrange, and tweeter filter boards
are independent of one another. Each includes provisions
for single-wired, bi-wired, and bi-amplified connections as
well as flexible controls for user adjustments.
Indicates sound quality in context with other specifications.
18kHz A breakthrough measurement, this specification closely
correlates to sound quality in a single curve—a long-standing
goal of loudspeaker engineers.
In-room response is measured through the use of large
anechoic chambers. The loudspeaker's response is measured
every 10 degrees, horizontally and vertically, for a total of
72 response measurements.
The in-room response curve is a prediction of how the
loudspeaker would measure in a typical room. Research
and observation reveals that ubiquitous on-axis response
curves cannot distinguish between two loudspeakers with
radically different sound qualities.
Indicates sound quality in context with the individual
20Hz loudspeaker's application, considering the acoustical impact
of its placement. An ideal response goal, a target response
is not flat at either end of the audible spectrum and is used
when the ideal reference is not a flat line.
Indicates the response listeners hear in relation to the first
17kHz reflections from walls, ceilings, and floors. This specification
indicates that Revel loudspeakers will remain accurate,
even in listening rooms that cast strong reflections.
Indicates the on-axis response of the loudspeaker. An
18kHz improved on-axis measurement, this specification reduces
the visual confusion of inaudible interference. It retains full
accuracy without using "spectral smoothing," which results
in significant data loss.
Indicates the low-frequency response of the loudspeaker.
Studies have shown that the –10dB specification best
correlates to controlled listening tests. At low frequencies,
most loudspeaker and listening room combinations
demonstrate significant room gain, which produces an
increase in levels as frequencies decrease. Unlike the –3dB
specification, the –10dB specification reflects the steepness
of low-frequency roll-offs.
Specifications are subject to change without notice.
Definition
allows a reasonably designed power