Niles Audio Stereo System SVL 4AB User Manual

M O  
D
E L  
SVL-4AB  
SVL-4AB  
SPEAKER SELECTION/VOLUME CONTROL SYSTEM  
WITH A/B AMPLIFIER INPUTS  
I N S T A L L A T I O N & O P E R AT I O N G U I D E  
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Feat ures and Benefit s  
The SVL-4AB offers a number of improvements over other  
speaker selector/volume controllers:  
Amplifier A/B Switching—The SVL-4AB provides amplifier  
switching for each pair of speakers. The switches are  
“break-before-make“ and simultaneously switch both  
grounds and hots. This allows any two amplifiers to safely  
and reliably operate simultaneously.  
TECH  
SUPPORT  
HOTLINE  
If you have  
questions regarding  
the operation of the  
Niles SVL-4AB, con-  
tact your local Niles  
dealer or Niles  
The SVL-4AB uses 12-position POP-FREE volume controls  
which are superior to 10-position designs. You get a  
broader range of adjustment —there are 10 steps of atten-  
uation 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".  
Customer Service at  
1-800-289-4434.  
Greater dynamic range —you get 42 dB of total attenua-  
tion instead of the usual 20 or 30 dB.  
Pre-printed Room Labels are included for easy identification  
of speaker ON/OFF buttons.  
Isolated left and right channel ground returns make the  
SVL-4AB compatible with all types of amplifiers.  
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Rear panel switches for constant or selectable impedance  
protection for each amplifier. You can use constant protec-  
tion on one of your two amplifiers and manual protection  
for the other.  
Self-cleaning, silver-plated switch contacts assure many  
years of trouble free use.  
Printed circuit board design assures high reliability.  
Two-piece removable connectors greatly simplify installa-  
tion and hookup. All wiring can be attached directly to the  
connectors before installing them in the SVL-4AB.  
100% tested, electronically and acoustically, for frequency  
response, distortion and power handling.  
Standard 17" width allows the SVL-4AB to stack neatly  
with other standard size components.  
May be used with 4, 6, or 8-ohm speaker systems.  
Ideal for both home and commercial sound installations.  
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-4AB Power Handling  
TOOLS  
REQUIRED  
The SVL-4AB is designed for use with receivers or amplifiers  
having a maximum power output of 100 watts per channel at  
8 ohms. Damage caused by the use of higher-power receivers  
or amplifiers will void the warranty. Consult your Niles dealer  
or receiver/amplifier manufacturer if you are uncertain about  
the power rating of your receivers or amplifiers.  
• 1/8" Standard  
Slotted Screwdriver  
• Wire Stripper  
IMPORTANT: DO NOT USE THE SVL-4AB WITH AMPS OR  
RECEIVERS RATED AT MORE THAN 100 WATTS PER CHANNEL  
RMS AT 8 OHMS.  
IMPORTANT  
DO NOT use the  
SVL-4AB 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 m anufacturers do not recom m end  
connecting more than two pairs of speakers without using  
some form of impedance correction.  
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The SVL-4AB includes impedance correction circuitry which  
protects each of your receivers or amplifiers from low imped-  
ance loads. The circuitry assures that both of your receivers or  
amplifiers will recognize a safe operating load, even when one  
amplifier is playing all four speaker pairs at the same time.  
The actual impedance load the SVL-4AB presents to each of  
your receivers or amplifiers will vary, depending on how  
many speaker pairs are playing, and the impedance rating of  
each speaker. If you have four pairs of 8-ohm speakers play-  
ing from one of your receivers/amplifiers, the SVL-4AB will  
present a 4.5 ohm impedance load to it. With four pairs of 4-  
ohm speakers playing, the load drops to slightly under 4  
ohms.  
"TECH TIP"  
It is recommended that you use the SVL-4AB with receivers  
or amplifiers that are capable of driving a 4-ohm load.  
Consult your Niles dealer, or the receiver/amplifier manufac-  
turer, if you are uncertain about the capabilities of the  
receiver/amplifier.  
Wire size is  
expressed by it's  
AWG (American  
Wire Gauge)  
number. The lower  
the AWG number,  
the larger the  
Type of Speaker Wire  
wire,  
i.e., 12 AWG wire is  
physically larger  
For most applications, we recommend you use 16 or 18  
gauge stranded copper speaker wire for the SVL-4AB connec-  
tions. For wiring runs longer than 80 feet, 14 gauge wire is  
recommended. Using speaker wire larger than 14 gauge for  
the SVL-4AB connections is not recommended —the wire  
5
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may not fit into the connectors. Never use solid-core, alu-  
minum, or "Romex" type wire with the SVL-4AB. When run-  
ning 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  
dealer, building contractor, or local building and inspection  
department if unsure about which type of wire is best for  
your application.  
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  
though the speakers. If you must locate the SVL-4AB wiring  
near electrical devices, route the speaker wires several feet  
away from the electrical wiring.  
Using the SVL-4AB with Tube-Type Amplifiers  
Virtually all tube amplifiers must have a load connected at all  
times. If one of the amplifiers to be connected to the SVL-4AB  
is a tube amplifier, be sure to always have at least one pair of  
speakers switched on at all times. An alternative is to perma-  
nently connect a 150 ohm, 5 watt resistor across the tube  
amplifier's output in parallel with the SVL-4AB. See (Figure 1)  
on next page for a hookup diagram.  
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Tube Amplifier  
Figure 1  
Using a  
Tube Amplifier  
1505 Watt Resistor  
150  
150  
Niles SVL-4AB  
AMPLIFIER  
L- R-  
SPEAKER  
4
SPEAKER  
3
SPEAKER  
2
SPEAKER  
1
L+  
R+  
L+  
L-  
R-  
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
ON OFF  
CONSTANT  
PROTECTION  
Niles Audio  
Corporation,  
Miami, Florida USA  
7
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Recessed areas for  
custom room  
labels.  
12 position volume control provides  
greater attenuation than conven-  
tional 10 position designs.  
Attractive  
low-profile  
design.  
SVL-4 AB SPEAKER SELECTION/ VOLUME CONTROL SYSTEM  
A
B
OFF  
ON  
A
B
OFF  
ON  
A
B
OFF  
ON  
A
B
OFF  
ON  
PROTECTION  
SPEAKER  
1
SPEAKER  
2
SPEAKER  
3
SPEAKER  
4
Each speaker pair is independently  
activated with a simple pushbutton  
On/Off switch.  
Protection switch safeguards both  
of your receivers or amplifiers  
even with one amplifier playing all  
4 pairs of speakers.  
Each speaker pair can individu-  
ally select one of two source  
amplifiers with a dedicated  
push-button A/B switch.  
AMPLIFIER  
A
AMPLIFIER  
L- R-  
B
SPEAKER  
4
SPEAKER  
3
SPEAKER  
2
SPEAKER  
1
L+  
L
-
R
-
R+  
L+  
R+  
L+  
L
-
R
-
R+  
L+  
L-  
R-  
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
CONSTANT  
PROTECTION  
ON OFF  
ON OFF  
NILES  
Niles Audio Corporation, Inc.  
Miami, Florida USA  
A
B
Two-piece  
removable  
connectors.  
Constant Impedance  
Protection Switches for  
each amplifier.  
8
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Inst allat ion  
1. Select a convenient location for the SVL-4AB.  
2. Run all the necessary wiring to the SVL-4AB. Label the  
wires for future reference. See (Figure 2).  
Figure 2  
Wiring Diagram  
TUNER 94.9  
15  
Receiver A  
AMPLIFIER  
L- R-  
SPEAKER  
4
SPEAKER  
3
SPEAKER  
2
SPEAKER  
1
L+  
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
L+  
L
-
R
-
R+  
ON OFF  
CONSTANT  
PROTECTION  
Niles Audio  
Corporation,  
Miami, Florida USA  
Niles SVL-4AB  
Speaker  
Pair 4  
Speaker  
Pair 3  
Speaker  
Pair 2  
Speaker  
Pair 1  
9
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3. Make th e con n ection s to th e SVL-4AB. Th e  
amplifier/speaker connectors on the SVL-4AB are removable.  
If you wish, you may remove the SVL-4AB's connectors to  
facilitate installation [see (Figure 3)]. 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 connector terminals. Be certain that  
proper “phasing” is observed . To achieve proper phasing,  
connect the positive terminals on the SVL-4AB to the positive  
terminals on the amplifiers and speakers and the negative  
terminals on the SVL-4AB to the negative terminals on the  
amplifiers and speakers. If you are using only one amplifier it  
should be connected to the “Amplifier Aconnector and the  
pushbutton switches marked “A/Bshould be left out or in  
the “Aposition. If you will be using two amplifiers, connect  
the second amplifier to the “Amplifier Bconnector on the  
SVL-4AB. Re-install the connectors if they were removed. See  
(Figure 4).  
Figure 3  
Removing the  
Connectors  
4. Locate the pre-printed Room Labels. Affix the appropriate  
label to the recessed area over each ON/OFF selector button.  
Figure 4  
Installing the Connectors  
10  
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Operat ion  
The are two ways to use the SVL-4AB. You may play and  
adjust the volume of one pair of speakers at a time, or play  
multiple pairs simultaneously.  
"TECH TIP"  
If your amplifier or  
receiver has "A"  
and "B" speaker-  
pair outputs,  
connect the SVL-4AB  
to the "A" outputs.  
Do not connect  
If you intend to play more than one pair of speakers at the  
same time, you will need to become familiar with the opera-  
tion of the SVL-4AB's PROTECTION button.  
Playing One Pair of Speakers At a Time  
anything to "B".  
This will prevent  
the amplifier or  
1. Make sure the amplifier or receiver power is OFF and set  
the volume to minimum.  
2. Set the SVL-4AB volume control for the speaker pair you  
wish to play to maximum (fully clockwise).  
receiver from driving  
an unusually low  
impedance load.  
3. Locate the ON/OFF button on the SVL-4AB which corre-  
sponds to the speaker pair you wish to play. Set it to the ON  
position.  
4. Adjacent to the ON/OFF button is the amplifier A/B but-  
ton. Choose an amplifier for the active speaker pair by press-  
ing the A/B button in for “Band out for “A.  
5. Turn on the amplifier or receiver and select a 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  
11  
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not to overdrive or "clip" your am plifier. If the sound  
"TECH TIP"  
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.  
You will need to  
activate the SVL-  
4AB's PROTECTION  
button whenever the  
overall system  
impedance might fall  
below  
7. Using the appropriate volume control on the front of the  
SVL-4AB, adjust the volume of the speakers to the desired lis-  
tening level.  
8. You can turn off the speakers by turning the appropriate  
volume control on the SVL-4AB fully counter-clockwise or by  
pressing the ON/OFF button.  
9. You can switch to the other amplifier by pressing the  
amplifier A/B button.  
Playing Two or More Speaker Pairs Simultaneously  
1. Make sure both of the amplifiers are OFF and set the vol-  
ume controls to minimum.  
2. On the right side of the SVL-4AB's front panel is a button  
labeled PROTECTION. This button activates the SVL-4AB's  
impedance correction circuitry. The circuitry assures that both  
of your receivers or amplifiers will see a safe operating load  
when playing multiple speaker pairs 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.  
12  
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When playing the following speakers:  
1 or 2 pair of 8-ohm speakers  
The Protection button should be:  
OFF  
ON  
OFF  
ON  
ON  
3 or 4 pairs of 8-ohm speakers  
1 pair of 4-ohm speakers  
2, 3, or 4 pairs of 4-ohm speakers  
Any combination of 4 and 8 ohm speakers  
Set the PROTECTION button to the correct position using the chart shown above.  
3. Set the SVL-4AB volume controls which correspond to the  
speaker pairs you wish to play to maximum (fully clockwise).  
"TECH TIP"  
The volume control  
of your amplifier or  
receiver acts as the  
master volume for all  
of your speaker  
pairs. Set this control  
to a comfortable (not  
maximum)) listening  
level. Be careful not  
to overdrive or “clip”  
your amplifier. If you  
hear distortion from  
your speakers  
4. Locate the appropriate ON/OFF buttons on the SVL-4AB.  
Set them to the ON position.  
5. Adjacent to the ON/OFF buttons are the amplifier A/B but-  
tons. Choose an amplifier for each active speaker pair by  
pressing the A/B button in for “Band out for “A.  
6. Turn on the amplifiers or receivers and select a source,  
such as the tuner or CD player.  
7. Slowly turn up each of the amplifiers or receivers 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.  
reduce the volume of  
your amplifier to  
avoid damaging your  
speakers.  
8. Using the appropriate volume controls on the front of the  
SVL-4AB, adjust the volume of the speakers to the desired lis-  
tening level. The volume control of your receiver or amplifier  
acts as the master volume for all of your speaker pairs.  
13  
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9. You can turn off the speakers by turning the correspond-  
ing volume controls on the SVL-4AB fully counter-clockwise,  
or by pressing the appropriate ON/OFF button. Refer to the  
Protection Chart located on page 13 for the correct setting of  
the PROTECTION button.  
SPECIFICATIONS  
Audio Power  
Handling  
100 watts/channel  
continuous music  
power  
10. At any time, you may choose to switch any of the active  
speaker pairs to one or the other of the amplifiers by pressing  
the corresponding amplifier A/B button.  
Frequency Response  
+/- 1.2 dB from 20 Hz  
to 20 kHz  
Constant Protection Switches  
Mounting  
Table-Top component  
The SVL-4AB is equipped with rear panel overrides of the  
protection circuits that enables you to maintain constant  
impedance protection regardless of the position of the front  
panel switch. This will safeguard either or both of your ampli-  
fiers from being overdriven due to accidental or improper  
use by anyone unfamiliar with the equipment.  
Wiring Requirements  
Individual runs of  
2-conductor speaker  
wire. Connectors  
accommodate wire  
sizes 14-22 gauge (16  
gauge recommended)  
To engage one or both of these overrides, move the rear  
panel "CONSTANT PROTECTION" switches to the "ON" posi-  
tion. Constant impedance protection will be maintained until  
the switches are turned to "OFF".  
Overall Dimensions  
17" (432mm) wide x  
2" (51mm) high x  
9 1/4" (235mm) deep  
Weight  
7 1/2 lbs. (3.4 kg).  
14  
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Niles Audio  
Corporation  
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 believes in constantly improving 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 1/99 DS00127A  
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