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
HPS-4/HPS-6
HIGH POWER SPEAKER SELECTION SYSTEM
Niles Audio
Corporation
©2004 Niles Audio Corporation. All rights reserved. Niles, the Niles logo and Blending High Fidelity and
Architecture are registered trademarks of Niles Audio Corporation. Because we strive to improve our products,
Niles reserves the right to change product specifications without notice. The technical and other information
contained herein is not intended to set forth all technical and other specifications of Niles products. Additional
information can be obtained on-line at www.nilesaudio.com or by calling Niles at 1-800-289-4434. Printed in
China 1/04 DS00358ACN
12331 S.W. 130 Street
Miami, Florida 33186
Tel: (305) 238-4373
Fax: (305) 238-0185
®
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3. Locate the on/off buttons on the HPS-4/HPS-6 which cor-
respond to the speaker pairs you wish to play. Set them to
the ON position (Engaged).
Installation Considerations
“TECH TIP”
Power Handling
You will need
to activate the
The HPS series is designed for use with a receiver or amplifier
having a maximum power output of 250 watts per channel at
8 ohms. Damage caused by the use of a higher-power receiv-
er or amplifier will void the warranty. Consult your Niles deal-
er, or receiver/amplifier manufacturer, if you are uncertain
about the power rating of your receiver or amplifier.
4. Turn on the amplifier or receiver and select a source, such
as the tuner or CD player.
HPS-4/HPS-6’s
protection button
whenever the overall
system impedance
might fall below
4 ohms.
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.
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 con-
necting more than two pairs of speakers without using some
form of impedance correction.
When playing the following speakers:
1 or 2 pairs of 8-ohm speakers
The Protection button should be:
OFF
ON
OFF
ON
ON
3 or more pairs of 8-ohm speakers
1 pair of 4-ohm speakers
The HPS series 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 all four speaker pairs
are playing at the same time.
2 or more 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.
The actual impedance load the speaker selector presents to
your receiver or amplifier 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 playing, the
HPS-4/HPS-6 series will present a 4.5 ohm impedance load to
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Figure3
Removing the Connectors
Using the HPS Series with Tube-Type Amplifiers
Virtually all tube amplifiers must have a load connected at all
times. If the amplifier to be connected to the HPS-4/HPS-6 is a
tube amplifier, be sure to always have at least one pair of speak-
ers 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 HPS-4/HPS-6. See (Figure 1).
SPEAKER 4
Installation
1. Select a convenient mounting location.
“Tech Tip”
2. Run all the necessary. Label the wires for future reference.
See (Figure 2).
3. Make the connections to the speaker selector. The amplifi-
er/speaker connectors on the HPS are removable. If you
wish, you may remove the HPS’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 appro-
priate hole on the connector terminals. Be certain that
proper phasing is observed—connect the positive termi-
nals on the HPS to the positive terminals on the amplifier
and speakers and the negative terminals on the HPS to the
negative terminals on the amplifier and speakers. Re-install
the connectors if they were removed. See (Figure 4).
Figure4
Installing the Connectors
SPEAKER AIRS
Wire size is
expressed by it’s
AMPLIFIER
AWG (American Wire
Gauge) number. The
lower the AWG num-
ber, the larger the
wire, i.e., 12 AWG
wire is physically
larger than 14 AWG.
Insert the connector plug into the socket and lock in place-
by tightening captive screws on each side of connector.
4. Affix the appropriate label to the recessed area over each
on/off selector button.
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Tube Amplifier
Recessed
areas for
custom room
labels.
HPS-4 HIGH POWER SPEAKER SELECTION SYSTEM
Figure1
PROTECTION
Using a
Attractive
low-profile
design.
1
2
3
4
Tube Amplifier
Simple
push-button
operation.
Connect up to four pairs
of speakers.
Protection switch safeguards your
receiver or amplifier even with
all pairs of speakers playing.
Niles HPS-4
Niles Audio Corporation Miami, Florida USA
Niles Audio Corporation Miami, Florida USA
AMPLIFIER
SPEAKER
4
SPEAKER
3
SPEAKER
2
SPEAKER
1
AMPLIIFIER
SPEAKER 4
SPEAKER
3
SPEAKER 2
SPEAKER 1
ON OFF
CONSTANT
PROTECTION
ON OFF
CONSTANT
PROTEECTION
Constant
Impedance
Protection
Switch
Two-piece
removable
connectors.
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Operation
There are two ways to use the HPS-4/HPS-6. You may play one
pair of speakers at a time, or play multiple pairs simultaneously.
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 PROTECTION button.
Receiver
Figure2
Wiring Diagram
Playing One Pair of Speakers At a Time
1. Make sure the amplifier or receiver power is OFF and set
the volume to minimum.
TUNER 94.9
15
2. Locate the on/off button on the HPS-4/HPS-6 which corre-
sponds to the speaker pair you wish to play. Set it to the
ON position (Engaged).
Niles HPS-4
Niles Audio Corporation Miami, Florida USA
AMPLIIFIER
SPEAKER 4
SPEAKER 3
SPEAKER 2
SPEAKER 1
3. Turn on the amplifier or receiver and select a source, such
as the tuner or CD player.
ON OFF
CONSTANT
PROTECCTION
4. 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.
Speaker
Pair 4
Speaker
Pair 3
Speaker
Pair 2
Speaker
Pair 1
5. To turn off the speaker pair, simply press the corresponding
on/off button on the HPS-4/HPS-6.
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Playing Two or More Speaker Pairs Simultaneously
1. Make sure the amplifier or receiver power is OFF and set
the volume to minimum.
your receiver/amplifier. With six pairs of 4-ohm speakers
playing, the load drops to slightly under 4 ohms.
If you intend to use the HPS series with more than two pairs
of 4-ohm speakers, it is recommended that you verify that
the receiver or amplifier is capable of driving a 4-ohm load.
Consult your Niles dealer, or receiver/amplifier manufacturer,
if you are uncertain about the capabilities of the
receiver/amplifier.
“TECH TIP”
Tools
Required
2. On the right side of the HPS-4/HPS-6’s front panel is a but-
ton labeled PROTECTION. This button activates the
HPS-4/HPS-6’s impedance correction circuitry. The circuit-
ry assures that your receiver or amplifier will see a safe
operating load when playing multiple speaker pairs simul-
taneously. 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 imped-
ance might fall below 4 ohms. Use the following chart as a
guide for setting the Protection button.
If your amplifier
or receiver has “A”
and “B” speaker-
pair outputs,
connect the speaker
selector to the “A”
outputs. Do not con-
• 1/8" Standard
Slotted Screwdriver
• Wire Stripper
Type of Speaker Wire
For most applications, we recommend you use 16 or
18 gauge, stranded copper speaker wire for the HPS-4/HPS-6
connections. For wiring runs longer than 80 feet, 14 gauge
wire is recommended. Using speaker wire larger than
14 gauge for the HPS-4/HPS-6 connections is not recom-
mended—the wire may not fit into the connectors. Never
use solid-core, aluminum, or “Romex” type wire with the
HPS-4/HPS-6. 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 dealer, building contractor, or
local building and inspection department if unsure about
which type of wire is best for your application.
nect anything to “B”.
This will prevent the
amplifier or receiver
from driving an
unusually low
impedance load.
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
through the speakers. If you must locate the HPS-4/HPS-6
wiring near electrical devices, route the speaker wires several
feet away from the electrical wiring.
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6. To turn off one or more speaker pairs, simply press the
corresponding on/off button(s) on the speaker selector.
Refer to the protection chart for the correct setting of the
Protection button.
Features and Benefits
Constant Protection Switch
The HPS-4 and HPS-6 offer a number of improvements over
other speaker selectors:
The HPS-4/HPS-6 is equipped with a manual override for the
protection circuit that enables you to defeat the front panel
protection switch and maintain constant impedance protec-
tion. This will safeguard your amplifier from being overdriven
due to accidental or improper use by anyone unfamiliar with
the equipment.
• Power handling: 250 watts per channel RMS
• Protection circuit safeguards receiver/amplifier
TECH
SUPPORT
HOTLINE
• Separate left and right ground paths for compatibility with
all amplifiers
To engage this override, move the rear panel “Constant
Protection” switch to the “On” position. Constant imped-
ance protection will be maintained until the switch is turned
to “Off”.
If you have questions
regarding the opera-
tion of the Niles HPS
series, contact your
local Niles dealer
or Niles Technical
Support at
• Rear-panel switch for constant or selectable impedance
protection
• Removable connectors accommodate up to 12 gauge wire
• Rugged all metal chassis construction
• Non-skid feet won’t scratch furniture and ensure unit stability
during operation
1-800-289-4434.
• 72 adhesive-backed room identification labels
• Requires an amplifier that is compatible with a 4 ohm load
• Warranty: Ten-year limited
• Dimensions: 17" wide x 2" high x 8-5/8" deep
• Shipping weight: approximately 7 lbs
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