Boston Acoustics VRS Pro Manuale utente

VRS Pro

Home Theater

Surround Speaker

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) 141⁄4x 45⁄8x 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 charac-

teristics 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 51⁄4" (135mm) bass unit. Frequencies above 350Hz

are handled by a pair of 21⁄2" (65mm) high-frequency dri-

vers, one ﬁring forward and the other backward. Gold-plated ﬁve-way binding posts allow the con-

nection of virtually any speaker cable. Straightforward mounting of the speaker on any wall or ceil-

ing 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 pro-

duces 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.

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, ceil-

ing and ﬂoor before returning to the listener as

diffuse sound, which comes from all around the

listener.

Room Placement

Room placement is one of the most important

factors contributing to the quality of home

theater sound. Take a few minutes to place

your speakers correctly to ensure they will

sound their best.

Place the VRS Pro speakers on either side of

the listening area.

One or both of the VRS Pro speakers may be

hung from the ceiling. Make sure the arrow on

the rear label points to the front of the room.

IMPORTANT: Your speakers have been packed

as a LEFT and RIGHT matched set. Make sure

that each speaker is mounted on the correct side,

with the bass unit pointing to the front of the

theater area. The arrow on the back of each speak-

er should point toward the front of the room.

If the listening position is against the wall,

place the speakers to either side, no less than

20" (50cm) from the rear wall.

If the viewing area is in a corner, the speakers

may be placed to either side on adjacent walls.

Connecting Your VRS Pro Speakers

Connect the speaker’s terminals to those on the ampliﬁer or receiver designated for “surround” or

“rear channel effects.” Maintain consistency of the +(red) and –(black) connections by using the

markings on the wire.

We recommend 18-gauge (or heavier) speaker wire for runs up to 25' (8m), and thicker 16-gauge

speaker wire for longer runs. Strip 1⁄2" (12mm) of insulation from the ends of each wire to expose

the conductors. Tightly twist the wire strands together. Maintain the consistency of the +(red) and

– (black) connections.

IMPORTANT: Typically, one side of the hook-up wire is ribbed and the

other is smooth. Connect the ribbed side to the +(red) terminals and

the smooth side to the –(black) terminals.

WARNING: To prevent electrical shock, always switch off the ampliﬁer

or receiver when making connections to the speaker.

Using the ﬁve-way binding posts: The binding posts permit easy con-

nection to banana plugs, pins, spade lugs and bare wire. The metal sur-

faces are plated with 24K gold to resist corrosion.

Wall or Ceiling Mounting Your VRS Pro Speakers

The VRS Pro is designed to be mounted directly onto a wall or ceiling. Attach the supplied bracket

to the wall or ceiling and clip the speaker to the bracket.

You may run wires to the speakers on the wall surface or behind the wall. Use the recessed area on

the back of the speaker to accommodate the wire slack.

Mounting on drywall, paneling or other hollow

surfaces: Use the 6-32 x 2" machine screws and

toggle wings provided. The toggle wings require

a 1⁄2" (12mm) hole.

Mounting on wood and other solid surfaces:

Use a #6 or #8 wood screw.

Mounting on masonry, adobe and similar sur-

faces: Consult a knowledgeable installer about

proper hardware. You will obtain best results with

#6 or #8 wood screws.

IMPORTANT: Your speakers have been packed

as a LEFT and RIGHT matched set. Make sure

that each speaker is mounted on the correct

side, with the bass unit pointing toward the

front of the theater area. The arrow on the back

of each speaker should point toward the front.

MOUNTING

1. Make two holes using the bracket as a tem-

plate. If running wires behind the wall, make a

hole for them 1" (25mm) below the bracket (top

right).

2. Insert the machine screws through the brack-

et and thread onto the toggle wings before

penetrating the wall (center right).

3. Level the bracket and tighten the screws.

Connect the wires and hang the speaker on the

brackets, so the arrow on the label points to

the front of the home theater area (right).

29⁄32"

(23mm)

Drill 1⁄2" (12mm) holes

toggle wings

Level bracket

before hanging

speaker

6-32 x 2"

machine screws

(25mm)

Painting Your VRS Pro Speakers

You may paint the surface and grilles of your VRS Pro speakers. You will need:

• A small screwdriver or knife to remove the grilles from the cabinet

• A fast-drying primer, such as Krylon®Sandable Spray Primer #1318

• Masking tape and scrap paper, and a clean dry cloth.

To paint the cabinet:

IMPORTANT: Do not paint the red and black

electrical terminals or the black area behind the

grilles.

1. Remove the grilles: Use a small screwdriver

or knife to snap open the back edge of each

grille near the terminals.

2. Mask off the baffles with masking tape and

scrap paper, and wipe any dust from the

cabinet.

3. Apply two thin coats of primer and let dry

thoroughly.

4. Apply ﬁnishing paint and let dry.

5. Remove masking tape and paper.

To paint the grilles:

IMPORTANT: Avoid painting the grilles in a

way that causes the holes to be ﬁlled.

1. Remove the grilles: Use a small screwdriver

or knife to snap open the back edge of each

grille near the terminals.

2. Paint the grilles: Primer is not required. If

using a spray paint, use two thin coats. If using

a house paint, thin the paint to avoid ﬁlling the

perforation holes in the grille. Let the paint dry

completely.

3. Reinsert the grilles: Insert the front edge in

the groove near the logo and then snap the

rear of the grille into place on the cabinet.

Listening Levels and Power Handling

IMPORTANT: Adjusting Listening Volume. To obtain the best home theater effect, balance the

sound level of each speaker. Home theater systems contain a test signal that simpliﬁes this proce-

dure. Refer to the instructions provided with your surround sound electronics.

The power recommendation for the speaker assumes the ampliﬁer is not overdriven, which, over a

long period, can damage even our rugged speakers. If you hear a harsh, gritty noise on peak levels,

turn down the volume control. Prolonged or repeated operation with a distorted signal from the

ampliﬁer can cause damage to the speakers, which is not covered by the warranty.

Limited Warranty

For ﬁve years from the date of purchase, Boston Acoustics will repair for the original owner any

defect in materials or workmanship that occurs in normal use of the speaker system, without

charge for parts and labor.

Your responsibilities are to use the system according to the instructions supplied, to provide safe

and secure transportation to an authorized Boston Acoustics service representative and to present

proof of purchase in the form of your sales slip when requesting service.

Excluded from this warranty is damage that results from abuse, misuse, accidents, shipping or repairs

or modiﬁcations by anyone other than an authorized Boston Acoustics service representative.

This warranty is void if the serial number has been removed or defaced.

This warranty gives you speciﬁc legal rights, and you may also have other rights which vary from

state to state.

If Service Seems Necessary

First, contact the retailer from whom you purchased the speaker. If that is not possible, write to:

Boston Acoustics, Inc., 300 Jubilee Drive, Peabody, MA 01960.

Send us:

1. Your name, address and daytime telephone number.

2. When and where you purchased the speaker system and a copy of your sales slip.

3. Makes/models of your signal sources and ampliﬁer.

4. Description of the problem.

5. Whether you have the original carton and ﬁllers or need new ones.

We will promptly advise you of what action to take. If it is necessary to return your speaker to the

factory, please ship it prepaid. After it has been repaired, we will return it freight prepaid in the U.S.

and Canada.

300 Jubilee Drive

Peabody, MA 01960

508-538-5000

Boston and Boston Acoustics are registered trademarks

of Boston Acoustics, Inc. Dolby, ProLogic and AC-3 are

registered trademarks of Dolby Laboratories Licensing

Corporation. THX is a registered trademark of Lucasﬁlm Ltd.

Speciﬁcations subject to change without notice. 42-603-0

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