Boston Acoustics VRSPro User's Manual

VRS Pro
Home Theater Surround Speaker
2
Specifications
Frequency Response (±3dB) 80–20,000Hz
Recommended Amplifier Power 15–150 watts
Sensitivity [1 watt (2.83v) at 1m] 86dB
Bass Unit 51⁄4" (135mm) copolymer
High-Frequency Driver Dual 21⁄2" (65mm) polymer-treated paper
Crossover Frequency 350Hz
Dimensions (HxWxD) 141⁄4 x 45⁄8 x 61⁄2" (360 x 116 x 165mm)
Weight/each 7 lbs (3kg)
Finish Black or white
Description
The VRS Pro is a THX®-certified, high-output, diffuse-field surround speaker. It provides the rear channel surround sound effects with AC-3
®
, THX and ProLogic®decoding electronics. Its low- and high-frequency response charac­teristics comply with the requirements for AC-3 and THX systems.
The VRS Pro cabinet is sculptured to aim sound along the walls, rather than directly at the listener, and to blend with the room’s decor. Frequencies from 80 to 350Hz are handled by a 5
1
4" (135mm) bass unit. Frequencies above 350Hz
are handled by a pair of 2
1
2" (65mm) high-frequency dri­vers, one firing forward and the other backward. Gold-plated five-way binding posts allow the con­nection of virtually any speaker cable. Straightforward mounting of the speaker on any wall or ceil­ing can be easily accomplished with the enclosed brackets.
A diffuse-field surround sound speaker is the best for reproducing the enveloping surround sound experienced in a movie theater. The theater employs an array of surround loudspeakers (often our Boston A70T theater speakers) distributed around the sides and rear of the theater. Typically, the array is split into two halves, left and right. The listener hears sound from many speakers, which pro­duces a three-dimensional sensation for the surround sound. A diffuse-field speaker achieves the same effect by directing the sound initially away from the listener and permitting it to be reflected from the walls and ceiling. The sound then arrives at the listener from a multitude of directions and simulates the loudspeaker array in a movie theater.
3
Diffuse Sound
In a movie theater, a diffuse surround sound field is created by using an array of surround speakers around the sides and rear of the theater. Since this is not practical in the home, a diffuse-field speaker achieves the same effect with a single pair of speakers.
When a conventional direct-radiating speaker is used for surround, sound is aimed directly at the listener. Because the listener can localize the sound, the surround effect is spoiled (above right).
The VRS Pro contains a pair of high-frequency drivers, operating with opposite polarities— one speaker pushes out and the other pulls in. This directs most of the sound sideways (right). The VRS Pro generates a “figure 8” pattern above 350Hz, along the walls of the room. The sound is then reflected from the end walls, ceil­ing and floor before returning to the listener as diffuse sound, which comes from all around the listener.
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