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
Nominal Impedance 8 ohms
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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