Sensitivity

86.4 dB SPL with 2.83 V @ 1m (2 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) 3.7 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 3.7 Ω allows a reasonably designed power amplifier to drive Revel loudspeakers.

Filter Network

Four-way, high-order acoustic response @ 150 Hz, 575 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

– 3 dB from 23 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 29 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.