Revel Gem 2 - Manual (Page 23)

Ultima Gem2
Owner’s Manual 23
SPECIFICATIONS
GEM2 SPECIFICATIONS
Specifications Value Definition
Sensitivity 86.4 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 ampli-
fier is not required to drive Revel loudspeakers to reasonable volume levels in
large listening spaces.
Impedance 6 Ω (nominal),
3.4 Ω (minimum)
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 3.4 Ω allows a reasonably designed
power amplifier to drive Revel loudspeakers.
Filter Network Three-way, high-order acoustic response
@ 400 Hz and 2.3 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 - 3dB from 70 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
measured in a 4 π 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 75 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.