Niles Audio Stereo System SVL 2 User Manual

M O  
D
E L  
SVL-2  
SVL-2  
SPEAKER SELECTION/VOLUME CONTROL SYSTEM  
NILES  
®
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  
 
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Feat ures and Benefit s  
The SVL-2 offers a number of improvements over other  
speaker selector/volume controllers:  
The SVL-2 uses 12 position volume controls which are  
superior to 10 position designs. You get a broader range of  
adjustment —there are 10 steps of attenuation instead of 8.  
Steps 11-6 attenuate -3 dB per step; steps 5-2 are 6 dB per  
step. Step 12 is "full-on" and step 1 is "full-off".  
TECH  
SUPPORT  
HOTLINE  
If you have  
questions regarding  
the operation of the  
Niles SVL-2, contact  
your local Niles  
Greater dynamic range —you get 42 dB of total attenua-  
tion instead of the usual 20 or 30 dB.  
POP-FREE switching between all steps.  
dealer or Niles  
Customer Service at  
1-800-289-4434.  
Pre-printed Room Labels are included for easy identification  
of speaker ON/OFF buttons.  
Isolated right and left channel ground returns make the  
SVL-2 compatible with all types of amplifiers.  
Self-cleaning, silver-plated switch contacts assure many  
years of trouble free use.  
Printed circuit board design assures high reliability.  
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Spring-loaded push terminal connectors accommodate up  
to 14 gauge wire or "pins", making the SVL-2 compatible  
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-ohm speaker 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 +/-1.2 dB.  
Ten year parts and labor warranty.  
Proudly made in the USA.  
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Inst allat ion Considerat ions  
SVL-2 Power Handling  
TOOLS  
REQUIRED  
The SVL-2 is designed for use with a receiver or amplifier hav-  
ing a maximum power output of 100 watts per channel at 8  
ohms. Damage caused by the use of a higher-power receiver  
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.  
• Wire Stripper  
IMPORTANT: DO NOT USE THE SVL-2 WITH AMPS OR  
RECEIVERS RATED AT MORE THAN 100 WATTS PER  
CHANNEL RMS AT 8 OHMS.  
IMPORTANT  
DO NOT use the  
SVL-2 with 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-ohm speakers are connected in  
parallel, the impedance will be 4 ohms, two pairs of 4-ohm  
speakers 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 connect-  
ing two pairs of 4-ohm speakers without using some form of  
impedance correction.  
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The SVL-2 includes 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 of 4-ohm  
speakers are playing at the same time.  
Type of Speaker Wire  
"TECH TIP"  
For most applications, we recommend you use 16 or 18  
gauge stranded copper speaker wire for the SVL-2 connec-  
tions. For wiring runs longer than 80 feet, 14 gauge wire is  
recommended. Using speaker wire larger than 14 gauge for  
the SVL-2 connections is not recommended —the wire may  
not fit into the connectors. Never use solid-core, aluminum,  
or "Romex" type wire with the SVL-2. When running speaker  
wires inside walls, most states and municipalities in the U.S.  
specify that you must use a special type of speaker wire.  
Usually, the requirement is that the wire has a specific "CL"  
fire rating, such as "CL-2" or "CL-3". Consult your Niles deal-  
er, building contractor, or local building and inspection  
department if unsure about which type of wire is best for  
your application.  
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.  
Avoiding Interference  
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-2 wiring  
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near electrical devices, route the speaker wires several feet  
away from the electrical wiring.  
Using the SVL-2 with Tube-Type Amplifiers  
Virtually all tube amplifiers must have a load connected at all  
times. If the amplifier to be connected to the SVL-2 is 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 the SVL-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  
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Niles Audio  
Corporation, Inc.  
Miami, Florida USA  
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12 position volume control  
provides greater attenuation  
than conventional 10 position  
designs.  
Recessed  
areas for  
custom room  
labels.  
SVL-2 SPEAKER SELECTION/ VOLUME CONTROL SYSTEM  
PROTECTION  
Attractive  
low-profile  
design.  
N
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1
2
Simple  
push-button  
operation.  
Connect up to two pairs  
of speakers.  
Protection switch safeguards your  
receiver or amplifier even with  
both pairs of speakers playing.  
AMPLIFIER  
+
SPEAKER 2  
SPEAKER 1  
+
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Niles Audio  
Corporation, Inc.  
Miami, Florida USA  
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Spring  
loaded push  
connectors.  
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Inst allat ion  
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  
Wiring Diagram  
15  
Niles SVL-2  
AMPLIFIER  
SPEAKER 2  
SPEAKER 1  
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Niles Audio  
Corporation, Inc.  
Miami, Florida USA  
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Speaker  
Pair 2  
Speaker  
Pair 1  
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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 in to th e ap p rop riate h ole on th e sp rin g -  
load ed con n ector term in als. Be certain th at p rop er  
phasing is observed —connect the positive terminals on  
the SVL-2 to the positive terminals on the amplifier and  
speakers and the negative terminals on the SVL-2 to the  
negative term inals on the am plifier and speakers. See  
(Figure 3).  
4. Locate the pre-printed Room Labels. Affix the appropriate  
label to the recessed area over each ON/OFF selector button.  
Figure 3  
Removing the  
Connectors  
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Operat ion  
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's PROTECTION button.  
"TECH TIP"  
If your amplifier or  
receiver has "A"  
and "B" speaker-  
pair outputs,  
connect the SVL-2  
to the "A" outputs.  
Do not connect  
anything to "B".  
This will prevent  
the amplifier or  
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-2 volume control for the speaker pair you wish  
to play to maximum (fully clockwise).  
3. Locate the ON/OFF button on the SVL-2 which corre-  
sponds to the speaker pair you wish to play. Set it to the ON  
position.  
receiver from driving  
an unusually low  
impedance load.  
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 am plifier. 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.  
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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 listen-  
ing level.  
7. You can turn off the speakers by turning the appropriate  
volume control on the SVL-2 fully counter-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's front panel is a button  
labeled PROTECTION. This button activates the SVL-2's imped-  
ance correction circuitry. The circuitry assures that your receiv-  
er 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 over-  
all system impedance might fall below 4 ohms. Use the follow-  
ing chart as a guide for setting the PROTECTION button.  
When playing the following speakers:  
1 or 2 pair of 8-ohm speakers  
1 pair of 4-ohm speakers  
The Protection button should be:  
OFF  
OFF  
ON  
2 or more pairs of 4-ohm speakers  
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-2 volume controls to maximum.  
4. Locate the ON/OFF buttons on the SVL-2. Set both to the  
ON position.  
"TECH TIP"  
You will need to  
5. Turn on the amplifier or receiver and select as source, such  
as the tuner or CD player.  
activate the SVL-2's  
PROTECTION button  
whenever the overall  
system impedance  
might fall below  
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 am plifier. 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.  
4 ohms.  
7. Using the appropriate volume controls on the front of the  
SVL-2, adjust the volume of the speakers to the desired listen-  
ing level.  
8. You can turn off the speakers by turning the appropriate  
volume controls on the SVL-2 fully counter-clockwise, or by  
pressing the appropriate ON/OFF buttons.  
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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's volume 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 the SVL-2 vol-  
ume 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-top component  
Wiring Requirements  
Individual runs of 2-conductor speaker wire. Connectors  
accommodate wire sizes 14-22 gauge (16 gauge recommended)  
Overall Dimensions  
8-1/2" wide x 2" high x 7-1/4" deep  
Weight  
3 lb.  
14  
 
NILES ®  
®
Niles Audio  
Corporation  
www.nilesaudio.com  
© 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  
12331 S.W. 130 Street  
Miami, Florida 33186  
Tel: (305) 238-4373  
Fax: (305) 238-0185  
 

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