Niles Audio SVL-2 User Manual

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M O D E L

SVL-2

SVL-2

SPEAKER SELECTION/VOLUME CONTROL SYSTEM

®

I N S T A L L A T I O N & O P E R A T I O N G U I D E

S P E A K E R S E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

SVL-2

Speaker Selection/

Volume Control

System

TABLE OF CONTENTS

Introduction

Introduction

1

The SVL-2is a combination speaker selector and volume con-

troller. It allows you to connect two pairs of speakers to your

 

 

Features and

 

stereo receiver or amplifier and adjust the volume of each

Benefits

2

pair independently. Additionally, you can choose to listen to

 

 

either pair of speakers, or both pairs simultaneously. You

Installation

 

don't have to worry about overloading your amplifier. The

Considerations 4

SVL-2has a protection circuit that keeps your amplifier run-

Installation

8

ning safely, even with both pairs of speakers playing.

 

Operation

10

A perfect application for the SVL-2is individually controlling

speaker "ON/OFF" and volume adjustment for two pairs of

Specifications

14

speakers: one pair in the room with the main stereo system

and another pair at a remote location. The SVL-2adjusts the

 

 

volume of the speakers connected to it by attenuating the

 

 

amplifier signal. Niles volume controls use autoformers

 

 

instead of L-padsfor the volume controlling element. This

 

 

assures minimal internal power dissipation with virtually no

 

 

power wasted as heat.

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S P E A K E RS E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

Features and Benefits

The SVL-2offers a number of improvements over other speaker selector/volume controllers:

The SVL-2uses 12 position volume controls which are superior to 10 position designs. You get a broader range ofadjustment—thereare 10 steps of attenuation instead of 8. Steps11-6attenuate-3dB per step; steps5-2are 6 dB per step. Step 12 is"full-on"and step 1 is"full-off".

Greater dynamic range—youget 42 dB of total attenuation instead of the usual 20 or 30 dB.

POP-FREEswitching between all steps.

Pre-printedRoom Labels are included for easy identification of speaker ON/OFF buttons.

Isolated right and left channel ground returns make the SVL-2compatible with all types of amplifiers.

Self-cleaning,silver-platedswitch contacts assure many years of trouble free use.

Printed circuit board design assures high reliability.

TECH

SUPPORT

HOTLINE

If you have questions regarding the operation of the Niles SVL-2,contact your local Niles dealer or Niles Customer Service at1-800-289-4434.

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S P E A K E RS E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

Spring-loadedpush terminal connectors accommodate up to 14 gauge wire or "pins", making theSVL-2compatible with most"high-definition"speaker cables.

100% tested, electronically and acoustically, for frequency response, distortion and power handling.

Only 8 1/2" wide. Match the width of 17" components by combining with another Niles 1/2 width product.

May be used with 4, 6 or 8-ohmspeaker systems.

Ideal for both home and commercial sound installations.

Only a wire stripper is required for installation.

Power handling: 100 watts/channel continuous music power.

Frequency response: 20 Hz to 20 kHz +/-1.2dB.

Ten year parts and labor warranty.

Proudly made in the USA.

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S P E A K E RS E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

Installation Considerations

SVL-2Power Handling

The SVL-2is designed for use with a receiver or amplifier having a maximum power output of 100 watts per channel at 8 ohms. Damage caused by the use of ahigher-powerreceiver or amplifier will void the warranty. Consult your Niles dealer, or receiver/amplifier manufacturer, if you are uncertain about the power rating of your receiver or amplifier.

IMPORTANT: DO NOT USE THE SVL-2WITH AMPS OR RECEIVERS RATED AT MORE THAN 100 WATTS PER CHANNEL RMS AT 8 OHMS.

Amplifier Impedance Load

As more pairs of speakers are parallel connected to a receiver or amplifier, the overall system impedance becomes lower. For example, if two pairs of 8-ohmspeakers are connected in parallel, the impedance will be 4 ohms, two pairs of4-ohmspeakers in parallel become 2 ohms, and so on.

Most receivers or amplifiers are not rated for use below a 4 ohm load. Most manufacturers do not recommend connecting two pairs of4-ohmspeakers without using some form of impedance correction.

TOOLS

REQUIRED

• Wire Stripper

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The SVL-2includes impedance correction circuitry which protects your receiver or amplifier from low impedance loads. The circuitry assures that your receiver or amplifier will see a safe operating load, even when two pairs of4-ohmspeakers are playing at the same time.

"TECH TIP"

Wire size is expressed by it's AWG (American Wire Gauge) number. The lower the AWG number, the larger the wire, i.e., 12 AWG wire is physically larger than 14 AWG.

-

is

.

.

-

Speaker wires can act as an antenna for electrical noise. Locating speaker wires too close to a light dimmer or switch may cause a "buzzing" or "popping" sound to be heard thought the speakers. If you must locate the SVL-2wiring

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S P E A K E RS E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

near electrical devices, route the speaker wires several feet away from the electrical wiring.

Using the SVL-2withTube-TypeAmplifiers

Virtually all tube amplifiers must have a load connected at all times. If the amplifier to be connected to the SVL-2is a tube amplifier, be sure to always have at least one pair of speakers switched on at all times. An alternative is to permanently connect a 150 ohm, 5 watt resistor across the tube amplifier's output in parallel with theSVL-2.See (Figure 1) for hookup diagram.

Tube Amplifier

Figure 1

Using a

Tube Amplifier

 

150

 

150

 

 

 

 

 

 

 

 

Niles SVL-2

 

 

AMPLIFIER

 

SPEAKER 2

SPEAKER 1

 

+

 

+

+

 

 

+

N I L E S

-

 

-

-

 

 

-

Niles Audio

 

 

 

 

 

 

 

 

 

 

Corporation, Inc.

L

R

 

L

R

L

R

Miami, Florida USA

 

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12 position volume control provides greater attenuation than conventional 10 position designs.

Recessed areas for

custom room SVL-2 SPEAKER SELECTION/VOLUME CONTROL SYSTEM

labels.

PROTECTION

Attractive

 

 

low-profile

1

2

design.

 

 

Simple

 

Connect up to two pairs

push-button

 

of speakers.

operation.

 

 

N I L E S

Protection switch safeguards your receiver or amplifier even with both pairs of speakers playing.

 

AMPLIFIER

 

SPEAKER 2

SPEAKER 1

+

 

+

+

 

 

 

+

N I L E S

 

 

 

 

 

 

 

-

 

-

-

 

 

 

-

Niles Audio

 

 

 

 

 

 

 

Corporation, Inc.

L

R

 

L

R

L

R

Miami, Florida USA

 

Spring loaded push connectors.

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Installation

1.Select a convenient location for the SVL-2.

2.Run all the necessary wiring to the SVL-2.Label the wires for future reference. See (Figure 2).

Receiver

TUNER 94.9

 

Figure 2

15

 

Wiring Diagram

 

 

 

Niles SVL-2

 

AMPLIFIER

SPEAKER 2

SPEAKER 1

+

+ +

+

N I L E S

 

 

 

 

 

 

 

-

 

-

-

 

 

 

-

Niles Audio

 

 

 

 

 

 

 

Corporation, Inc.

L

R

 

L

R

L

R

Miami, Florida USA

 

Speaker

Speaker

 

Pair 2

Pair 1

8

 

 

S P E A K E RS E L E C T I O N/ V O L U M EC O N T R O LS Y S T E M

3.Make the connections to the SVL-2.Strip 3/8" of insulation from the end of each wire. Tightly twist the end of each wire until there are no frayed ends. Insert each wire into the appropriate hole on the springloaded connector terminals. Be certain that proper phasing is observed — connect the positive terminals on theSVL-2to the positive terminals on the amplifier and speakers and the negative terminals on theSVL-2to the negative terminals on the amplifier and speakers. See (Figure 3).

4.Locate the pre-printedRoom Labels. Affix the appropriate label to the recessed area over each ON/OFF selector button.

Figure 3

Removing the

Connectors

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Operation

The are two ways to use the SVL-2.You may play and adjust the volume of either pair of speakers independently, or both pairs simultaneously.

If you intend to play both pairs simultaneously, and either pair is less than 8 ohms, you will need to become familiar with the operation of the SVL-2'sPROTECTION button.

Playing One Pair of Speakers At a Time

1.Make sure the amplifier or receiver power is OFF and set the volume to minimum.

2.Set the SVL-2volume control for the speaker pair you wish to play to maximum (fully clockwise).

3.Locate the ON/OFF button on the SVL-2which corresponds to the speaker pair you wish to play. Set it to the ON position.

4.Turn on the amplifier or receiver and select as source, such as the tuner or CD player.

5.Slowly turn up the amplifier or receiver volume and set it to a comfortable (not maximum) listening level. Be careful not to overdrive or "clip" your amplifier. If the sound becomes muddy or distorted, you have reached the limit of your amplifier's volume capability and should quickly reduce the volume to avoid damaging your speakers.

"TECH TIP"

If your amplifier or receiver has "A" and "B" speakerpair outputs, connect the SVL-2to the "A" outputs. Do not connect anything to "B". This will prevent the amplifier or receiver from driving an unusually low impedance load.

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6.Using the appropriate volume control on the front of the SVL-2,adjust the volume of the speakers to the desired listening level.

7.You can turn off the speakers by turning the appropriate volume control on the SVL-2fullycounter-clockwise,or by pressing the ON/OFF button.

Playing Two Pairs of Speakers Simultaneously

1.Make sure the amplifier or receiver power is OFF and set the volume to minimum.

2.On the right side of the SVL-2'sfront panel is a button labeled PROTECTION. This button activates theSVL-2'simpedance correction circuitry. The circuitry assures that your receiver or amplifier will see a safe operating load when playing two pairs of speaker simultaneously. Since most receivers and amplifiers are not rated for use below a 4 ohm load, you will need to activate the PROTECTION button whenever the overall system impedance might fall below 4 ohms. Use the following chart as a guide for setting the PROTECTION button.

When playing the following speakers:

The Protection button should be:

1 or 2 pair of 8-ohmspeakers

OFF

1 pair of 4-ohmspeakers

OFF

2 or more pairs of 4-ohmspeakers

ON

Any combination of 4 and 8 ohm speakers

ON

 

 

Set the PROTECTION button to the correct position using the chart shown above.

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3.Set both SVL-2volume controls to maximum.

4.Locate the ON/OFF buttons on the SVL-2.Set both to the ON position.

5.Turn on the amplifier or receiver and select as source, such as the tuner or CD player.

6.Slowly turn up the amplifier or receiver volume and set it to a comfortable (not maximum) listening level. Be careful not to overdrive or "clip" your amplifier. If the sound becomes muddy or distorted, you have reached the limit of your amplifier's volume capability and should quickly reduce the volume to avoid damaging your speakers.

7.Using the appropriate volume controls on the front of the SVL-2,adjust the volume of the speakers to the desired listening level.

8.You can turn off the speakers by turning the appropriate volume controls on the SVL-2fullycounter-clockwise,or by pressing the appropriate ON/OFF buttons.

"TECH TIP"

You will need to activate the SVL-2'sPROTECTION button whenever the overall system impedance might fall below

4 ohms.

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Balancing Speaker Volume

The volume control on your receiver or amplifier serves as the "master" volume for all speaker pairs connected.

The volume level of the speakers may vary from room to room. This is caused by several factors. Two lesser factors are the size of the speaker and its efficiency. The largest factor is the physical size of the room.

The SVL-2'svolume controls allow you to adjust the volume of each speaker pair individually. You can leave the amplifier or receiver volume set at one position and use theSVL-2volume controls exclusively.

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SPECIFICATIONS

Audio Power Handling

100 watts/channel continuous music power

Frequency Response

+/- 1.2 dB from 20 Hz to 20 kHz

Mounting

Table-topcomponent

Wiring Requirements

Individual runs of 2-conductorspeaker wire. Connectors accommodate wire sizes14-22gauge (16 gauge recommended)

Overall Dimensions

8-1/2"wide x 2" high x7-1/4"deep

Weight 3 lb.

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NILES ®®

Niles Audio

Corporation

www.nilesaudio.com

12331 S.W. 130 Street

Miami, Florida 33186

Tel: (305) 238-4373

Fax: (305) 238-0185

© 1999 Niles Audio Corporation. All rights reserved. Because Niles constantly strives to improve the quality of its products, Niles reserves the right to change product specifications without notice. Niles and the Niles logo are registered trademarks of Niles Audio Corporation. Printed in USA 4/96 DS00094A