Revel Voice 2 - Manual (Page 25)

Ultima Voice2
Owner’s Manual 25
SPECIFICATIONS
Specifications Value Definition
Sensitivity 89.0 dB SPL with 2.83 V @ 1m (4 π
anechoic) Indicates the amount of power the associated power amplifier must deliver to
drive the loudspeaker at reasonable volume levels. Conservatively-rated
specifications indicate high sensitivity, meaning that a massive power
amplifier is not required to drive Revel loudspeakers to reasonable volume
levels in large listening spaces.
Impedance 6.0 Ω (nominal)
3.6 Ω (minimum @ 90 Hz)
Indicates whether the loudspeaker presents a “difficult” or “easy” load on the
associated power amplifier. Combined with moderate phase angles, a
minimal impedance specification of 3.6 Ω allows a reasonably designed
power amplifier to drive Revel loudspeakers.
Filter Network Three-way, high-order acoustic response
@ 235Hz and 2 kHz Indicates the acoustical characteristics of the filter network. Steep filters
indicate an optimized filter network that produces minimal acoustical
interference, low distortion, and expansive dynamic range.
Frequency Range - 3 dB from 60 Hz to 45 KHz Describes the low frequency and high frequency at which the loudspeaker
system amplitude response is 3 dB lower than the average level, when mea-
sured in a 4π anechoic chamber. While the -3 dB frequencies are the industry
standard for specifying frequency range, Low Frequency Extension is a more
useful specification for comparing the low-bass output capabilities of
loudspeakers.
In-Room Response Relative to
Target Response
±0.5 dB from 65 Hz to 18 kHz Indicates sound quality in context with other specifications. 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.
Listening Window Response ±1.0 dB from 65 Hz to 20 kHz Indicates the on-axis response of the loudspeaker. An 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.