AMPLIFIERS
INSTALLATION GUIDE
SI
-
SERIES 2
CONGRATULATIONS!
Thank you for purchasing the award winning Niles SI-1230 Series 2, one of the
most versatile and powerful multi-channel ampliers ever offered. Like all Niles
products, the SI-1230 is built to the highest standards of quality and reliability.
With proper installation and operation, you’ll enjoy years of trouble-free use.
TABLE OF CONTENTS
INTRODUCTION 4
FEATURES AND BENEFITS 5
SYSTEM DESIGN BASICS 7
SYSTEM DESIGN CONSIDERATIONS 9
APPLICATIONS 11
CONFIGURING YOUR SYSTEM 15
INSTALLATION CONSIDERATIONS 16
FRONT AND REAR PANEL DETAILS 18
INSTALLATION 20
OPERATION 25
TROUBLESHOOTING GUIDE 27
SPECIFICATIONS 29
CONFIGURATION WORKSHEET 30
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2 Channel, BridgaBle Power amPlifiers
ImpORTANT SAFETy INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions .
5. Do not use this apparatus near water.
6. Clean o nly with a dry cloth.
7. Do not block any ventilation openings. Ins tall in
accordance with the manufacturer’s instructions.
8. Do not install ne ar any heat sources such as
radiato rs, hea t registers, stoves or other apparatus
(including ampliers) that produce heat.
9. Do not defeat the safety purpose of the polar ized
or groun ding-t ype plug. A polar ized plug has two
blades with one wider than the other. A groundingtype pl ug has two blades a nd a third g rounding
prong. T he wide bl ade or the third prong is provi ded
for your safety. If the provided p lug does not t into
your outl et, consult an electrician for replace ment of
the obsolete outlet.
10. Protect the power cord from be ing walked on
or pinch ed, par ticularly at plugs, convenience
receptacles a nd the point where they exit fr om the
apparatus.
11. Only us e attachments/accessories specied by
the manufacturer.
12. Use only with the car t, stan d,
tripod, bracket or table specied
by the manu factur er or sold with
the appa ratus. W hen a car t is
used, use caution when moving
the cart/apparatus combination to
avoid inju ry from tip-over.
13. Unplug this appar atus dur ing lightning storms or
when unu sed for long periods of tim e.
14. Refer all se rvicing to qualied service perso nnel.
Servicing is require d when the appara tus has been
damaged in any way, such a s power supply cord or
plug is da maged, liquid ha s been spilled or object s
have falle n into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped.
15. Do not expose this apparatus to drippi ng or
splashing and ensure that no objects lle d with
liquids, such as vases, are place d on the apparatus.
16. To completely disconnect this apparatus from
the AC Mains, disco nnect the power supply cord
plug fro m the AC receptacle.
17. The power supply co rd (sometimes referred
to as the “Mains Plug”) is used as the disconnect
device and shall remain ac cessible and operable at
all times.
18. Do not expose batte ries to excessive heat such
as sunshine, re or the like.
19. Open ame source s, such as lighted candle s,
should N OT be placed on the ap paratus.
WARNIN G: To redu ce the risk of fi re or elect ric
shock, do not expos e this apparatu s to rai n or
moisture.
The lightning ash with arrowhead
symbol, w ithin an e quilate ral triangle, is
intende d to aler t the user to the
presence of uninsulated “dangerous
voltage” within the produc t’s enclosure
that may be of sufcient magnitude to consti tute a
risk of electric shock to person s.
The exclamation point within an
equilateral triangle is intended to aler t
the user to the presence of im port ant
operating and maintenance (servicing)
instructions in the literature accompanying the
product.
FCC Required Text:
NOTE: This equipment has been tested and found
to comply with the limits for a Class B digital
device, p ursua nt to par t 15 of the FCC Rule s.
These limits are designed to provide reasonable
protection against harmful interference in a
residential installation. This equipment generates,
uses, and can radiate, radio frequency energy
and, if not installed and used in accordan ce with
the instructions, may cause harmful interference
to radio communications. However, there is no
guarantee that interference will not occur in a
particular install ation. If this equipment do es caus e
harmful inter ference to radio o r televis ion reception,
which ca n be determined by turning the equipment
off and o n, the use r is encouraged to try to co rrect
the inter ference by one or more of the following
measures:
—Reorient or relocate the receiving antenna.
—Increa se the separation betwe en the equipment
and receiver.
—Connect the equipment into an outlet on a
circuit different fro m that to which the rec eiver is
connected.
—Consult the dealer or an experie nced radio/TV
technician for help.
Changes or modications not expressly approved
by the par ty res ponsible for compliance could void
the user’s authori ty to operate the equipment.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
3
INTROdUCTION
We call the SI-1230 a Systems Integration Amplier because it is a power
amplier specically designed to solve the problems of interfacing with
different brands and models of equipment, different acoustic environments in
different rooms, and different kinds of applications: home theater, stereo, and
background music. As you read this manual and become more familiar with the
capabilities of the SI-1230 you’ll understand why its predecessor, the SI-1200,
was selected Best New Product 1994 by Sound & Video Contractor Magazine
and CEDIA (Custom Electronic Design and Installation Association). In addition,
the SI-1200 also won the Consumer Electronics Show’s Innovations ‘95 Design
and Engineering Award.
BRIdGABLE pOwER AmpLIFIERS
4
SI
-
12 30
SERIES 2
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2 Channel, BridgaBle Power amPlifiers
FEATURES ANd BENEFITS
REAL wORLd pOwER
The SI-1230 is a 12-channel amplier that delivers a solid 30 watts per channel
RMS into 8 ohms and 40 watts per channel RMS into 4 ohms. A new digital
power transformer design provides the energy necessary to efciently deliver
solid, deep, controlled bass response to a house full of speakers.
TwELvE TO SIx ChANNEL CONFIGURABLE pOwER
Each of the SI-1230’s six adjacent speaker output pairs are bridgeable. You
can create up to six 80 watt channels by sliding the bridging switches located
between each pair to the “bridged” position. This enables you to allocate more
power to specic locations, such as large rooms or outdoor applications.
FREEdOm FROm NOISE ANd CROSS-TALk
The SI-1230’s BusMatrix™ incorporates advanced PCB construction ensuring
extremely high channel to channel isolation. Signal to noise ratios and cross-talk
are equivalent to a professional mixing board found in a recording studio. With
the SI-1230, the music playing in the living room cannot interfere with the music
in the den.
TRANSpARENT SOUNd
The audio circuitry of the SI-1230 is constructed with the nest parts available,
including 1% metal lm resistors, high quality capacitors and oversized heat
sinks. All this attention to technical detail results in a sound that is clear and
uncolored.
BUSmATRIx™ SELECTOR
Our unique BusMatrix™ selector gives you the exibility to assign each channel
to a common Left, Right, or Mono signal bus, or to a dedicated signal input.
With BusMatrix™, routing surround sound to the master bedroom, stereo
to the den and mono to the powder room is as simple as icking a switch.
BusMatrix™ makes the SI-1230 an ideal multi-room or multi-zone amplier and
offers exciting new features and system design possibilities to the professional
installer.
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5
FEATURES ANd BENEFITS CONTINUEd...
INdEpENdENT LEvEL CONTROLS
Each amplier channel has an independent level control enabling you to adjust
the volume settings for twelve different speaker locations individually. Each
speaker can now be adjusted specically for its location and for who will be
listening!
TURN-ON mOdES
The SI-1230 features three turn-on modes: 1. Manual turn-on via the front
panel switch, 2. Audio Sense and 3. External Voltage trigger. Audio Sense and
External Voltage trigger modes enable you to congure the SI-1230 to interface
with any kind of system and turn on automatically.
AUTOmATIC pROTECTION
Each channel has independent thermal and short circuit protection. In the
unlikely event that a problem occurs on one channel, the other channels will
continue to play. When conditions return to normal, regular operation resumes.
STATUS dISpLAy FOR TROUBLEShOOTING
LED’s on the front panel indicate Power, Active and Protection Status. With
a glance at the frontpanel a troubleshooter is quickly provided with key
information!
dESIGNEd ANd ENGINEEREd IN ThE USA
Limited two-year parts and labor warranty.
6
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2 Channel, BridgaBle Power amPlifiers
SySTEm dESIGN BASICS
As shown in Figure 1, a distributed audio/video system is dened by the number
of listening zones it has. Within a listening zone you can listen to only one
source (e.g. CD, Radio, iPod, etc.) at any one time. A listening zone can consist
of a single room or a group of rooms. To achieve different volumes and greater
convenience in different rooms within a zone, individual volume controls can be
used. Niles makes volume controls in various styles and colors. When designing
your system, take into account who will use the system and when they will use
it. Consult your local Niles dealer for more information.
Figure 1
Plasma/
Blu-ray
Player
CD
Player
Cable
Box
LCD
RECEIVER
Family Room Living Room
Listening Zone 1
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7
SySTEm dESIGN BASICS CONTINUEd...
A MultiZone system as shown in Figure 2, offers the house hold more exibility.
For instance, a family might have their family room wired for surround sound
and their living room wired for background music. In a two zone system, the
children can watch TV in surround sound while Mom and Dad are reading the
paper and enjoying background music in the living room.
Figure 2
Plasma/
Blu-ray
Player
CD
Player
RECEIVER RECEIVER
Cable
Box
LCD
8
Family Room
Listening Zone 1 Listening Zone 2
Living Room
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2 Channel, BridgaBle Power amPlifiers
SySTEm dESIGN CONSIdERATIONS
SpEAkER COmpATIBILITy
A single channel (not bridged) of the SI-1230 is capable of driving a 4 ohm
impedance speaker load. No more than two 8 ohm speakers or no more than
one 4-6 ohm speaker can be safely connected to a single channel. Proper
ventilation of the SI-1230 is critical when driving lower impedance loads. If the
SI-1230 is not properly ventilated, the protection circuits may activate and shut
off the channel at higher volume levels (for more information on proper amplier
placement, see Installation Considerations on page 15).
A channel pair that has been BRIDGED is capable of driving an impedance load
of 8 ohms. Proper ventilation of the SI-1230 is critical when driving a 8 ohm load
with bridged channels. If the SI-1230 is not properly ventilated, the protection
circuits may activate and shut off the channel at higher volume levels (for more
information on proper amplier placement, see Installation Considerations on
page 15).
When designing your system, try to specify 6-8 ohm speakers (Niles offers a
complete line of inwall, in-ceiling, outdoor and home theater loudspeakers with
all models rated from 6-8 ohms).
CABLE ANd wIRE
Because the SI-1230 has many connections on the rear panel (see Figure
12), it is important that you correctly label all of the input cables and speaker
wires. Label the cables and wires with their destination or source, rather than
the SI-1230 terminal to which they are connected. This will make it easier to
recongure your system in the future.
The SI-1230 connects to your sources via shielded line level audio cables with
RCA connectors. Use high quality cables with your Niles amplier for the lowest
possible noise and best overall performance. Your Niles dealer can recommend
the proper cable.
The SI-1230 connects to your speakers using two conductor speaker wire.
For most applications, we recommend you use 16 or 18 gauge wire. For
wiring runs longer than 80 feet, we recommend 14 gauge wire. The SI-1230’s
high-quality, gold-plated 5-way binding posts will accommodate up to 12-gauge
wire. Attaching banana plugs to the wire will enable the connection of larger
wire sizes.
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9
SySTEm dESIGN CONSIdERATIONS CONTINUEd...
USING mONO FOR SmOOThER COvERAGE
In large or irregularly shaped rooms, you may nd that the main listening area
may be closer to one of the speakers. If the speakers in the room are connected
to a stereo amplier you will only hear half the music. The SI-1230’s BusMatrix™
enables you to create mono sound from one speaker without impacting the
stereo quality in the rest of the system. You can congure each room to either
stereo or mono as needed with no ill effects. Some of the most popular areas
where mono will greatly enhance the sound quality would be:
• Large rooms with many seating areas and/or many pairs of speakers.
• Irregularly shaped rooms.
• Bathrooms with one speaker over the tub and one speaker over the sink(s).
• Hallways or passageways (including those with multiple speakers).
• Small rooms, such as walk-in closets where more than a single speaker is not
required.
BRIdGING ChANNELS FOR AREAS
ThAT REqUIRE mORE vOLUmE ANd pOwER
There are several situations where bridging is an excellent way to improve the
sound. There are also applications where bridging would seem to be appropriate
but is not recommended. Bridging channels increases the power output to 80
watts per channel at 8 ohms.
These are some of the most common DOs and DON’Ts:
1. Outdoors (DO) — Sound dissipates faster outside than it does in a room
where the walls enclose the sound and reect it back to the listener. A pair of
speakers playing into a large patio or yard will greatly benet from bridging
four channels into two 80 watt channels.
2. Surround Sound Systems (DO) — The dynamic demands for the center
channel are much greater than the left, right or surround channels. This is an
excellent application for two channels to be bridged into one 80 watt channel.
3. More than one pair of 8 ohm speakers (DON’T) — In a large room or a
long hallway, often the best way to get good background music is to install
multiple pairs of speakers. You will actually deliver more power to two pairs of
8 ohm speakers by using two unbridged amplier channels than you would if
you bridged four amplier channels into two and connected the two pairs of
speakers in parallel.
10
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2 Channel, BridgaBle Power amPlifiers
AppLICATIONS
AdvANTAGES OF USING ThE SI-1230 IN A
SINGLE ZONE SySTEm
When you connect the preamplier outputs of your stereo receiver or stereo
preamplier to the SI-1230 BusMatrix™ you dedicate a robust 30 watts to each
speaker in your multi-room system as shown in Figure 3.
Each channel of the SI-1230 has its own level control so you can compensate
for architectural differences that create sonic imbalances. In addition, you can
ne tune the system so that when all of the room volume controls are set to the
loudest level, the large rooms and the small rooms play at the same volume.
Figure 3
Blu-ray
Player
PRE-AMP or
AM/FM RECEIVER
SI-1230 SERIES 2
CD
Player
Single Zone
Cable
Box
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11
AppLICATIONS
USING A dUAL-ZONE RECEIvER FOR TwO LISTENING ZONES
Most of today’s Dolby Digital Audio Video Receivers include a second zone
preamplier output to create a second listening zone. Using this output with the
SI-1230 BusMatrix™ input provides amplication for multiple rooms within a
second listening zone as shown in Figure 4.
In addition, in this example high power is supplied to the patio stereo speakers by
bridging channel pair 9 and 10 for the left speaker and bridging channel pair 11
and 12 for the right speaker.
Figure 4
(Home Theater)
SI-1230 SERIES 2
Blu-ray
Player
DUAL-ZONE SURROUND
SOUND RECEIVER
Zone 1
Front Speakers Center Speakers
CD
Player
Rear Speakers
Cable
Box
BusMatrix™
Niles High Power
Volume Controls
12
Living Room Kitchen Ofce Bedroom Patio
Zone 2
(Bridged Channels
9-10, 11-12)
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2 Channel, BridgaBle Power amPlifiers
AppLICATIONS
ExpANdING A mULTIZONE SySTEm TO
INCLUdE mORE ROOmS
In the ultimate MultiZone system, you connect six stereo preampliers (or a
single component multi-zone/multi-source preamplier) to the dedicated inputs
of SI-1230. These dedicated input signals are then routed to the appropriate
amplier channels via dip switch settings creating six completely independent
listening zones.
MultiZone systems enable listeners located in the six separate zones to
simultaneously listen to different source components as shown in Figure 5.
Figure 5
SI-1230 SERIES 2
Blu-ray
Player
Zone 6
321 4 5 6
ZR-6
MultiZone Receiver
Niles ZR-6
MultiZone Receiver
Preamp Output
(set to xed)
Room 1 Room 2 Room 3 Room 4 Room 5
CD
Player
BAND SET
FM 93.1
PRESET 1
BusMatrix™
Zone 1 - 5
Speaker Outputs
Cable
Box
Niles High Power
Volume Controls
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5
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13
AppLICATIONS
AddING pREAmpS TO CREATE mORE LISTENING ZONES
In the ultimate MultiZone system, you connect six stereo preampliers (or a single
component multi-zone/multi-source preamplier) to the dedicated inputs of SI-
1230. These dedicated input signals are then routed to the appropriate amplier
channels via dip switch settings creating six completely independent listening
zones.
MultiZone systems enable listeners located in the six separate zones to
simultaneously listen to different source components as shown in Figure 6.
Figure 6
Blu-ray
Player
Matrix Switching
Preamp
SI-1230 SERIES 2
Zone Outputs
CD
Player
Dedicated Inputs
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6
Cable
Box
14
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2 Channel, BridgaBle Power amPlifiers
CONFIGURING yOUR SySTEm
Because the SI-1230 offers so many conguration possibilities it is important to
plan carefully before you install it. Draw a block diagram of your system and use
the Conguration Worksheet on page 27 to record how you plan to connect your
SI-1230.
Here is an example filled out according to the block diagram on page 10.
Example 1
BUS INS & OUTS CONNECTED TO
Left Main Bus
Right Main Bus
Cascade Output
CH# BRIDGED DIP INPUT SOURCE SPEAKER
1
2
3
4
5
6
7
8
9
10
11
12
MODE SETTINGS IN USE SPECIAL
Constant
Audio Sense
Voltage Trigger
Control Output
L Main Bus Zone1 - Left
R Main Bus Zone1 - Right
L Main Bus Zone2 - Left
R Main Bus Zone2 - Right
L Main Bus Zone3 - Left
R Main Bus Zone3- Right
L Main Bus Zone4 - Left
R Main Bus Zone4 - Right
L Main Bus Zone5 - Left
R Main Bus Zone5 - Right
Stereo Receiver - 2nd Zone - Left Pre-Output
Stereo Receiver - 2nd Zone - Right Pre-Output
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15
INSTALLATION CONSIdERATIONS
Automating the turn-on of your SI-1230 is one of the easiest steps when installing
it in a distributed system. However, do not plug the main power cord into the
switched AC outlet of your preamplier or receiver. The high power design of the
SI-1230 requires large amounts of current from its AC power source. Additionally, it
is always recommended to activate the system preamplier/receiver before turning
on your SI-1230 in order to prevent system “turn-on thumps”. In order to address
these important needs, the SI-1230 has three special turn-on modes that let you
turn the amplier on only when it is needed. These three options are accessed by
the Turn-On Mode selector switch (see Figure 7).
Turn-On Modes
Constant – The auto turn-on circuitry is off. The
front panel master power switch operates the
amplier. In is “On”, Out is “Off”.
CONSTANT
Audio Sense – The master switch on the
Figure 7
TURN ON MODE
AUDIO SENSE
AC/DC
TRIGGER
3-30V
INPUT
front panel must be in the “On” position. The
amplier is off when there is no audio signal
present at any of the audio inputs, but the
sensing circuitry is on. The turn-on sensing
circuitry looks for a signal present at any of the
audio inputs. If it detects a signal, the adjacent
pair of amplier channels (i.e. channel 1 & 2 , 3
& 4, etc.) assigned to receive the input signals
will turn on. Once the audio signal stops, the
IMPORTANT! THE FRONT PANEL
POWER SWITCH MUST BE IN
THE ON (SWITCH IN) POSITION
FOR ANY OF THE THREE TURN-
ON OPTIONS TO FUNCTION
sensing circuit waits two minutes, then turns all
amplier channels off.
3-24 Volt Ac/Dc Opto-Isolated Voltage Trigger - The Power switch on the front
panel must be in the “On” position for the voltage trigger to function. When a
Trigger Plug is inserted into the rear panel connector and the sensing circuitry
detects a voltage, the amplier is turned on. Once the Trigger voltage is turned off,
the sensing circuit instantly turns the amplier off. The amplier is off when there
is no 3-24V AC or DC voltage detected at the trigger input. Voltage triggers can
be supplied by Niles automated switchers, some video projectors, some surround
sound processors, or something as simple as a 12 volt AC wall adapter plugged
into the switched outlet of your stereo receiver. Linear DC wall adapters are not
recommended; the long discharge time of the DC adapter’s lter capacitor will
delay the turn-off of the amplier. Trigger sources must be 3-24VAC or DC, 20mA or
greater.
16
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2 Channel, BridgaBle Power amPlifiers
INSTALLATION CONSIdERATIONS
pLACEmENT
Place the SI-1230 on a at, level surface like a table or shelf. It should be placed
upright so that its weight rests on the unit’s four feet. PLACING THE WEIGHT OF
THE AMPLIFIER ON THE REAR OR FRONT PANEL FOR EVEN AN INSTANT WILL
RESULT IN DAMAGE TO THE AMPLIFIER’S CONNECTORS AND CONTROLS.
The SI-1230, like any hi- component, will last much longer if it is given adequate
ventilation for proper cooling. When installing the SI-1230 in a cabinet, be sure
that the rear of the cabinet is open to fresh air to provide proper cooling (see
Figure 10). If the cabinet’s design will not accommodate an open rear, install two
small “boxer fans” to provide continuous air ow into and out of the cabinet (see
Figure 11). Place the SI-1230 so that there is at least 5” of free air space above
the chassis. If the amplier is located on a carpeted surface, place a board under
the amplier’s feet. Do not block the ventilation holes on the top and bottom of
the SI-1230.
The SI-1230 is equipped with a digital power transformer. This transformer
generates a powerful magnetic eld which could induce hum in a turntable
(particularly a turntable equipped with a moving coil cartridge). Do not place a
turntable directly above or directly adjacent to the SI-1230.
Boxer Fan (55 CFM)
directly centered 7” on
top of the Amplier.
Because the surface of the amplier may get hot, it
is recommended that a bafe or screen be placed
above the amplier to block hand access to the
top surface of the SI1230.
Make sure that there is a minimum of 7” of free air
space above the amplier for proper ventilation.
If the cabinet rear is not open to fresh air or if you’re
using low impedance loads, install two “boxer fans”
Allow a minimum of 2” of depth behind unit
to accommodate cables and connectors.
to provide continuous air ow into and out of the
cabinet.
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Boxer Fan (55 CFM)
directly centered 2”
behind the Amplier.
17
FRONT ANd REAR pANEL dETAILS
L+R
7
LEVEL
BRIDGED - BRIDGED +
7 8
LEVEL
BUS
USE CH 8
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
8
BUS
L
R
L+R
7
L
R
L+R
8
+
-
9
LEVEL
BRIDGED - BRIDGED +
9 10
LEVEL
BUS
USE CH 10
WHEN
BRIDGED
BRIDGED
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
CLASS II WIRING
10
BUS
L
R
L+R
9
L
R
L+R
10
+
-
Niles Audio, Carlsbad, California, USA
Designed and Engineered in the U.S.A. Made in China.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
Main Bus Inputs enable you to route
a stereo line level source to the
BusMatrix™ of the SI-1230
SI-1230
Systems Integration Amplif ier
SI-1230 SERIES 2
Systems Integration Am plif ier
MAIN
CASCADE
BUS
BUS
INPUT
OUTPUT
L
L
®
Front panel “Master Power” switch turns
off the entire amplifier, including the Turn-
On circuitry
Cascade outputs of the main bus input
enable you to daisy chain multiple
amplifiers
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme
®
NMB-003 du Canada.
1
BRIDGED
2
LEVEL
BUS
LEVEL
USE CH 2
WHEN
BRIDGED
L
R
L+R
1
L
R
BUS
L+R
2
3
3
LEVEL
LEVEL
L
L
R
R
BUS
BUS
L+R
L+R
3
3
BRIDGED
BRIDGED
USE CH 4
USE CH 4
WHEN
WHEN
BRIDGED
BRIDGED
4
4
LEVEL
LEVEL
L
L
R
R
BUS
BUS
L+R
L+R
4
4
5
BRIDGED
6
LEVEL
BUS
LEVEL
USE CH 6
WHEN
BRIDGED
L
R
L+R
5
L
R
BUS
6
“Turn-On” Mode Switch
3.5 mm Jack for
12v DC Control Input
18
R
R
TURN ON MODE
AUDIO SENSE
3-30V
12V CONTROL OUT
AC/DC
TRIGGER
INPUT
CONSTANT
3.5 mm Jack for
12v DC Control Output
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
+
-
1 2
CLASS II WIRING
4 Ω MINIMUM
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
BRIDGED - BRIDGED +
+
+
-
-
3 4
3 4
CLASS II WIRING
CLASS II WIRING
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4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
5 6
CLASS II WIRING
+
-
2 Channel, BridgaBle Power amPlifiers
FRONT ANd REAR pANEL dETAILS
Power LED illuminates to confirm the amplifier is
connected to a live AC power outlet and that the
master power switch is on
Bridging switches, BusMatrix controls,
dedicated inputs and level controls for each
channel
Gold-plated RCA jacks
Bicolor Status LED illuminates
“green” when the amplifier
circuitry has been turned on
by the Turn-On circuits, and
illuminates “red” to indicate
activation of the amplifier’s
built-in protection circuitry
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
7
BRIDGED
LEVEL
USE CH 8
WHEN
BRIDGED
L
R
BUS
L+R
7
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
+
-
7 8
CLASS II WIRING
8
LEVEL
L
R
BUS
L+R
8
9
LEVEL
BUS
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
9 10
BRIDGED
USE CH 10
WHEN
BRIDGED
L
R
L+R
9
+
-
CLASS II WIRING
10
LEVEL
BUS
L
R
L+R
10
11
BRIDGED
LEVEL
USE CH 12
WHEN
BRIDGED
L
R
BUS
L+R
11
4 Ω MINIMUM
(8 Ω MINIMUM IN BRIDGED MODE)
BRIDGED - BRIDGED +
BUS
+
-
11 12
CLASS II WIRING
Dual banana spaced binding post for
speaker connections
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
12
LEVEL
L
R
L+R
12
CAUTION: REPLACE WITH SAME TYPE AND
RATING FUSE
FUSE:
220-240V ~
100-120V ~
100-120V : T10AL/250V
220-240V : T5AL/250V
100-120 / 220-240 V~
50 / 60 Hz, 500W
Serial No.
Serial Number
Removable Two-prong
16 gauge 6’ AC power cord
19
INSTALLATION
LINE LEvEL AUdIO INpUT
CAUTION! The amplier must be off whenever you make changes to the input
connections.
STEP DESCRIPTION
1. Label all of the interconnecting cables for the sources
they connect to.
2. Connect the sources by inserting the RCA plug into the
amplifier’s jacks. NOTE: If you are using two amplifier
channels in “bridged” mode connect the input cable to
the even numbered amplifier input jack.
Use audio patch cables with RCA phono plugs
attached to the ends.
Connect outputs from your sources to inputs on the
amplifier. Never connect a source or preamplifier’s
input (e.g., record inputs) to the inputs of your
SI-1230.
CASCAdE AUdIO OUTpUTS
The “Cascade Audio Outputs” enable you to connect another amplier to your
preamplier output. The connectors are gold-plated RCA phono jacks. Connect
them to another amplier’s inputs with a standard audio patch cable. The
outputs are not buffered; if you wish to daisy-chain more than 5 Niles ampliers
you will need a Niles AVDA-3 buffered distribution amplier. A single AVDA-3
will allow you to daisy-chain 5 ampliers from each of its six outputs, allowing
30 SI-1230 power ampliers to be fed from the same master preamplier. If your
preamp has a vacuum tube output stage, you must use a Niles AVDA-3 to drive
more than a single SI-1230.
AC pOwER pLUG
STEP DESCRIPTION
1. Plug the female IEC socket of the supplied AC power
cord (the supplied power cord is designed for 120V AC
wall outlets), or use an appropriate IEC AC power cord
to match the electrical wall outlet you are using (e.g.
240V AC), into the IEC receptacle on the rear of the
amplifier.
If you use a grounded power strip, surge
suppressor or extension cord, verify that proper
ground is maintained.
CAUTION! Do not plug the amplifier’s cord into a
preamplifier’s convenience outlets.
20
The SI-1230 draws a maximum of approximately
890 watts from an AC wall outlet. This is much
more than the typical accessory outlet on the back
of a component will provide. Use the SI-1230’s
auto turn on circuitry to turn on the SI-1230
whenever the preamp is on.
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2 Channel, BridgaBle Power amPlifiers
INSTALLATION
SpEAkER wIRE CONNECTIONS
CAUTION! All speaker wire connections must be made with the amplier off.
Banana Plugs
Bare Wire
Unscrew the red or
black plastic knob,
insert the bare wire
end into the opening,
and then tighten the
knob until the wire is
securely clamped
There are many types of
banana plugs, some crimp,
some solder. The Niles
gold banana plug has 3
quick-connect binding
post for the bare wire on
the body of the plug. A
banana plug is simply
inserted into the jack at
the end of the amplier’s
binding post. Dual banana
plugs will t the binding
post.
STEP DESCRIPTION
1. Label all wires.
2. Connect one stripped wire end or banana
plug to the black terminal and one to the
red terminal. CAUTION- Avoid having even a
single strand of wire touching the chassis or
another connector.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
If you label the wires for their destination, rather than which
terminal of the SI-1230 they are connected to, it will be easier
to reconfigure your system in the future.
A. Split the speaker wire insulation so that at least two inches
of each conductor are separated.
B. Strip one half inch of insulation from the end of each
conductor of the speaker wire
C. Attach banana plugs or twist the strands of wire together
and insert them into the appropriate binding post.
21
INSTALLATION
BUSmATRIx ™ INpUT SwITCh SETTING
Each channel has a dedicated BusMatrix™ DIP switch that assigns that
channel’s source. To assign a signal from the Main Bus Input, select one of the
rst three switches which will give you either Left (L), Right (R) or Mono (L+R). To
assign the channel’s dedicated input select the fourth switch. Only ONE switch
should be selected to the “ON” position.
“OFF” Position
L
R
“ON” Position
STEP DESCRIPTION
Move only ONE switch to the “ON” position
for each channel.
ICAUTION! The DIP switch physically allows you to move all
four of the switches to the “On” position. If you accidentally
set more than one switch “On”, you will create an
undesirable mix of inputs on the entire bus.
22
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2 Channel, BridgaBle Power amPlifiers
5
LEVEL
LEVEL
BUS
USE CH 6
WHEN
BRIDGED
BRIDGED
6
BUS
L
R
L+R
5
L
R
L+R
6
7
LEVEL
LEVEL
BUS
USE CH 8
WHEN
BRIDGED
BRIDGED
8
BUS
L
R
L+R
7
L
R
L+R
8
BUS
Niles Audio, Carlsbad, California, USA
Designed and Engineered in the U.S.A. Made in China.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
BRIDGED –
12
BRIDGED +
INSTALLATION
BRIdGING TwO ChANNELS INTO ONE
The SI-1230’s bridging switches allow you to create a more powerful amplier
channel by combining or “bridging” two adjacent channels.
3
BRIDGED
3
BRIDGED
4
4
Slide the bridging
switch in the direction
of the arrow to bridge
LEVEL
LEVEL
USE CH 4
USE CH 4
WHEN
WHEN
BRIDGED
BRIDGED
LEVEL
LEVEL
two adjacent amplifier
channels. Set the
controls of the newly
bridged pair by using
BUS
BUS
L
L
R
R
L+R
L+R
3
3
BUS
BUS
L
L
the EVEN numbered
R
R
channel.
L+R
L+R
4
4
STEP DESCRIPTION
1. Choose which of the six pairs you wish to
bridge and move the bridging switch for that
pair to the “Bridged” position (toward arrow).
CAUTION! Do not connect a speaker load of
less than eight ohms to a bridged channel.
2. Connect the speaker wires to the two
Bridged speaker terminals (BRIDGED
+, BRIDGED -). Observe proper polarity
markings.
CAUTION! DO NOT connect a speaker selector
or headphone junction box to the output of a
bridged channel pair.
3. Use the EVEN NUMBERED input, DIP switch,
and level control for connections and
configuration.
The 12 channels are grouped into 6 pairs (e.g. 1 & 2). Only
the two channels within a pair can be bridged. Thus, only
channels 1 and 2, or channels 3 and 4 could be bridged.
You cannot bridge 2 and 3 for example.
A bridged channel on a SI-1230 is designed for an eight
ohm minimum load. Connecting a speaker with a nominal
impedance of less than 8 ohms may cause the SI-1230 to
go into protection or be damaged.
Connect your speaker wire only to the red terminals of the
two adjacent amplifier channels. If one of the speaker wires
touches a black terminal (thereby grounding the red “hot”
terminals) you will short circuit the amplifier.
These connections to a bridged channel pair will result in
either thermal shutdown or poor quality sound.
When two channels are bridged into one, make sure that
the odd numbered input DIP switches are all in the “off”
position.
When two channels are bridged
together, connect speakers to the
two terminals labeled “Bridged”.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
23
INSTALLATION
SETTING ThE TURN-ON
mOdE SwITCh
The SI-1230 has three turn-on modes. Select
the mode you want by sliding the mode switch.
See Installation Considerations on page 14 for
more information about each of the turn-on
modes.
TURN ON MODE
CONSTANT
AUDIO SENSE
3-30V
AC/DC
TRIGGER
INPUT
TIP: To conserve energy set the TURN ON mode to
either AUDIO SENSE or TRIGGER INPUT. Use of the
CONSTANT mode will prevent the amplifier from
turning off when not in use wasting energy.
ThE CONTROL OUTpUT
This terminal provides a 12V DC signal
suitable for triggering Niles automated
switchers, some motorized screens, some
electric curtain controls, etc. This voltage
is present only when the amplier is active
or on. When the amplier turns off, the 12V
signal is off.
STEP DESCRIPTION
1. Check the requirements of the device you
want to control.
The control output has a maximum
current capability of 150 mA.
SLIDE THE SWITCH WITH EITHER
YOUR FINGERNAIL OR 1/8”
SLOTTED SCREWDRIVER BLADE
2. Connect the 3.5 mm Jack to the control
output maintaining proper polarity
(tip = +).
24
Niles makes an accessory cable plug
FG00724.
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2 Channel, BridgaBle Power amPlifiers
OpERATION
pOwER SwITCh
The front panel switch is a master or “vacation” power switch. No matter which
turn-on mode you have selected, the master power switch will turn off all
circuitry including the sensing circuitry. If you will not be using the amplier for
an extended period of time, turn the master power switch “Off” (push button
switch out). When you would like to return to normal operation, turn the switch
“On” (push button switch in).
Important Notes: Equipment is not completely disconnected from main power
source when power switch is in the “OFF” position.
Power LED
The power LED indicates that the AC cord is plugged into a working AC power
receptacle and that the power switch is in the “On” position.
Bicolor Status LED
The bicolor Status LED illuminates “green” when the amplier circuitry has been
turned on by the Turn-On circuits, and illuminates “red” to indicate activation of
the amplier’s built-in protection circuitry due to either a fault in the wiring or the
speaker, or with the Niles System Integration Amplier ® itself.
Using Level Controls as Limiters
If your system is remote controlled, or if you think that some of the users like
to play the stereo too loudly, you can choose to calibrate the system so that it
is limited to a volume level you assign. The SI-1230 allows you to set different
volume levels for different rooms.
Calibrate your system volume levels with the steps outlined below:
1. Lower all of the SI-1230 level controls to the minimum volume position. If
there are any other ampliers in the system, lower their level controls to the
minimum (all of the ampliers in your system must have level controls).
2. Raise all of the individual in-wall volume controls to the loudest setting.
3. Play a loud radio station with the tuner set to Mono.
4. Raise the volume of your preamplier or receiver slowly– if you hear any
sound, lower the volume again and recheck all of your amplier levels, they
must be at minimum. If no sound is heard, proceed to step ve.
5. Have someone step into each room and listen as you adjust each level control
to the desired maximum level for that room. Adjust the balance between
speakers for the most common listening position in each room.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
25
OpERATION
LISTENING AT hIGhER vOLUmES
Thirty watts is enough power to play a conventional speaker in a normal sized
room loudly enough to completely drown out conversation. Even at levels like
that, the SI-1230 will sound clear and clean. However, it requires more power
to achieve a reasonable volume of sound in a large room than it does in a small
room. It is possible (even if you are not a teenager) to turn the volume so high
that the amplier runs out of power. This creates “clipping” distortion.
Clipping distortion makes treble sound very harsh and unmusical. When you
hear harsh sounding treble from any good speaker, turn the volume down
immediately! Those harsh sounds are masking some much more powerful
high frequency sound spikes which will quickly damage the tweeter of any
loudspeaker.
If you continue to operate the amplier at “clipping” power levels the protection
circuits will operate when the amplier overheats. The protection circuits reset
when the amplier’s internal circuitry cools. Reduce the volume to prevent a
reoccurrence. Perpetually overdriving your speakers and amplier is abuse and
probably voids the manufacturer’s warranty of all affected products.
CLEANING ANd mAINTENANCE
The internal parts of the SI-1230 are electronic and require no maintenance.
Once a year it is appropriate to twist the RCA connectors on each input to
remove any oxidation and improve conductivity.
You can clean only with dry cloth. Do not use any spray-type, abrasive
cleaners on the amplifier.
26
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2 Channel, BridgaBle Power amPlifiers
TROUBLE-ShOOTING GUIdE
When there is a problem consult this guide rst. If the problem persists, or you
have additional questions, call your local Niles dealer or call Niles Technical
Support at 1-800-289-4434. The most common problems relate to hook up.
Have your conguration worksheet handy when you call.
Symptom Possible Causes and Test Procedure
BusMatrix™ DIP switch is not in the correct position. Check your configuration worksheet for
the correct setting and verify.
Short circuit or loose wire at speaker or amplifier terminals. Check that connections are secure
and that there are no loose strands of wire crossing from the positive to the negative terminal
at the back of the amplifier and the speaker.
Short circuit or a break in the speaker wire. Disconnect the speaker wire at both ends, separate
No sound on one
channel
the 2 conductors at both ends and test with a meter for a short circuit. If there is no short,
connect the two conductors at one end and test with a meter for continuity.
Speaker is not working. Connect the speaker to a channel that plays another speaker. Audio
cable to dedicated input is bad. Connect the non-working channel input to another cable that is
known to be good.
Bridging Switch is in the wrong position. Check your configuration worksheet for the correct
setting and verify.
The thermal protection circuit has operated because of overheating caused by over driving or
inadequate ventilation.
BusMatrix™ DIP switches are not in the correct positions. Check your configuration worksheet
No sound on some or
all channels
Hum from all the
speakers
Amp will not turn on
and verify all settings.
Audio cable to the main bus inputs is bad. Connect the non-working channel input to another
cable that is known to be good. Some or all of the internal amplifier fuses are blown. (Return
the amplifier to your dealer for service).
Hum may be caused by a ground loop between two components in the system. Test for a
ground loop by reversing the AC plugs of any components in the system with non polarized AC
plugs.
Check for faulty cables, faulty source material, an ungrounded phono system, cable TV feed or
a defective component.
Master power switch must be on.
AC power cord must be plugged into a working outlet.
Test that the AC power receptacle is working. If the outlet tests O.K., the internal fuses are
blown. Return the amplifier to your dealer for service.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
27
TROUBLE-ShOOTING GUIdE
Symptom Possible Causes and Test Procedure
Sound is distorted
on one or all of the
channels at normal
volumes
Normal volume cannot
be reached
BusMatrix™ DIP switches are not in the correct positions.
Check your configuration worksheet and verify all settings.
One of the internal amplifier fuses is blown. (Return the amplifier to your dealer for service).
Bass sound is weak
and the stereo image is
“phasey” sounding in
one room
A speaker connected
to a bridged pair of
amplifier channels
sounds weak
Check that the bridging switch is “Off”. If two adjacent channels are connected normally but
the bridging switch is set to the “Bridged” position, the two speakers will play out of phase
with each other.
The loudspeakers are wired out of phase. Reverse the connections at the back of one speaker.
Check that the bridging switch is “On”.
BY PHONE (IN USA)
1-800-BUY-HIFI (289-4434)
BY PHONE (OUtSIdE USA)
1-760-710-0992
CUStOmEr SErvICE HOUrS
8:00 AM to 5:30 PM PT
tECHNICAl SUPPOrt HOUrS
6:00 AM to 4:00 PM PT
ON tHE wEB
28
www.nilesaudio.com
EmAIl tECHNICAl SUPPOrt
techsupport@nilesaudio.com
EmAIl fOr PrOdUCt SUggEStIONS
productsuggestions@nilesaudio.com
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2 Channel, BridgaBle Power amPlifiers
SpECIFICATIONS
Detail SI-1230 Series 2
Design Principle
Continuous
Average Power
Output
Continuous
Average Power
Output Bridged
Frequency
Response
Signal to Noise
Ratio
Total Harmonic
Distortion
Channel
Separation
Overall
Dimensions
Digital, high current bridgeable multi-channel amplifier
30 watts RMS per channel into 8 Ohms ,
40 watts RMS per channel into 4 Ohms (all channels driven)
80 watts RMS per channel into 8 Ohms
5Hz to 25kHz, +0dB/-3dB
20Hz to 20kHz unweighted - >102dB
@ 1kHz <.05%
@ 1kHz >70dB
17 ¼” (43.81 cm) wide
5 ¾” (14.5 cm) high (including feet)
16 ¼” (41.1 cm) deep
Weight
AC Mains:
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
Weight 35lb., 15.8 kg
100-120 / 220-240 V~, 50 / 60 Hz, 500W
29
CONFIGURATION wORkShEET
For ease of use, the Conguration Worksheet can be enlarged on a photocopier.
BUS INS & OUTS CONNECTED TO
Left Main Bus
Right Main Bus
Cascade Output
CH# BRIDGED DIP INPUT SOURCE SPEAKER
1
2
3
4
5
6
7
8
9
10
11
12
MODE SETTINGS IN USE SPECIAL
Constant
Audio Sense
Voltage Trigger
Control Output
30
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2 Channel, BridgaBle Power amPlifiers
LImITEd wARRANTy
Niles Audio Corporation (“NILES”) warrants to the original retail purchaser only that this product will be free of manufacturing defects
in material and workmanship for the following periods and subject to the limitations and exclusions set forth below:
Lifetime Warranty
All Passive Amplifier Products (those not requiring AC or battery power).
Ten years from the date of purchase
All Other Passive Products (those not requiring AC or battery power).
Two years from the date of purchase
All Active Products (those requiring AC or battery power).
This warranty is not transferable to subsequent purchasers of the product. To obtain warranty service, contact the authorized dealer
where you purchased your product or take the unit to the nearest authorized NILES dealer (with proof of purchase – claims made
without proof of purchase will be denied) who will test the product and if necessary, forward it to NILES for service. If there are no
authorized NILES dealers in your area, you must contact NILES to receive a factory Return Authorization Number. DO NOT RETURN
ANY UNIT WITHOUT FIRST RECEIVING WRITTEN AUTHORIZATION AND SHIPPING INSTRUCTIONS FROM NILES.
Upon examination, NILES will, at its sole option and expense, repair or replace any product found to be defective. NILES will return
the repaired or replaced unit to you via its usual shipping method from the factory to your address in the United States of America or
Canada only. Any shipping costs for addresses outside of the United States or Canada shall be the responsibility of the purchaser.
In the event that this model is no longer available and cannot be repaired effectively, NILES, at its sole option, may replace it with
a different model of equal or greater value, or refund the original purchase price paid. THE FOREGOING ARE YOUR EXCLUSIVE
REMEDIES FOR BREACH OF WARRANTY.
This Warranty does not include service or parts to repair damage caused by improper use or handling, including but not limited to
damage caused by accident, mishandling, improper installation, commercial use, abuse, negligence, or normal wear and tear, or any
defect caused by repair to the product by anyone other than NILES.
This warranty does not cover reimbursement for your costs of removing and transporting the product for warranty service
evaluation, or installation of any replacement product provided under this warranty.
This Warranty will be void if:
•the Serial Number on the product has been removed, tampered with or defaced.
• the product was not purchased from an authorized dealer or reseller.
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESSED AND IMPLIED WARRANTIES.
NILES EXPRESSLY DISCLAIMS ALL SUCH OTHER WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT, WITH RESPECT
TO THE PRODUCT. TO THE MAXIMUM EXTENT PERMITTED BY LAW, NILES SHALL NOT BE RESPONSIBLE FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES EXCEPT TO THE EXTENT PROVIDED (OR PROHIBITED) BY APPLICABLE
LAW, EVEN IF NILES HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Notwithstanding the above, if you qualify as a “consumer” under the Magnuson-Moss Warranty Act, or applicable state laws, then
you may be entitled to any implied warranties allowed by law for the Warranty Period. Further, some states do not allow limitations
on how long an implied warranty lasts or allow the exclusion or limitation of consequential damages, so such limitations may not
apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For the name of your nearest authorized NILES dealer, contact: THE AVC GROUP, 1969 Kellogg Avenue, Carlsbad, CA 92008,
or call (800) BUY-HIFI (289-4434) or (760) 710-0992. Please be advised that NILES only sells its products via the Internet through
a select group of authorized Internet dealers. These are listed on our website at www.nilesaudio.com. Products offered on the
Internet through unauthorized Internet dealers are not covered by the NILES warranty and may be either:
1) goods acquired on a secondary or grey market
2) counterfeit or stolen goods
3) damaged, or defective goods
Please fill in your product information and retain for your records.
Model ______________________ Serial No. _____________________________________________ Purchase Date ______________
ATTENTION: TO OUR VALUED CONSUMERS:
To insure that consumers obtain quality pre-sale and after-sale support and service, NILES products are sold exclusively through
authorized dealers. This warranty is VOID if the products have been purchased from an unauthorized dealer.
NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
31
1690 Corporate Circle, Petaluma, CA 94954
1-760-710-0992
1-800-BUY-HIFI – www.nilesaudio.com
©2012 Core Brands, LLC. All rights reserved. Niles and the Niles logos are registered
trademarks of Core Brands, LLC. All other trademarks are the property of their respective
owners. We reserve the right to change specifications, descriptions and prices without notice.
The technical and other information contained herein is not intended to set forth all technical
and other specifications. Designed and engineered in the USA. 9901253 Rev D
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