Niles SI-1230 Series 2 User manual

fJNILES.

CONGRATULATIONS!
Thank you for purchasing the award winning Niles Sl-1230 Series
2,
one
of
the
most versatile and powerful multi-channel amplifiers ever offered. Like all Niles
products, the Sl-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 only with a dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as
radiators, heat registers, stoves or other apparatus
(including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has
two
blades with one wider than the other. A grounding-
type plug has
two blades and a third grounding
prong. The wide blade or the third prong is provided
for your safety. If the provided plug does not fit into
your outlet, consult
an electrician for replacement of
the obsolete outlet.
10. Protect the power cord from being walked on
or pinched, particularly at plugs, convenience
receptacles and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by
the manufacturer.
12. Use only with the cart, stand,
tripod, bracket or table specified
by the manufacturer or sold with
the apparatus. When a cart is
used, use caution when moving
the cart/apparatus combination to
avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or
when unused for long periods
of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged
in any way, such as power supply cord or
plug is damaged, liquid has been spilled or objects
have fallen 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 dripping or
splashing and ensure that no objects filled with
liquids, such as vases, are placed on the apparatus.
16.
To completely disconnect this apparatus from
the
AC Mains, disconnect the power supply cord
plug from the
AC receptacle.
17. The power supply cord (sometimes referred
to as the "Mains Plug") is used as the disconnect
device and shall remain accessible and operable at
all times.
18. Do not expose batteries to excessive heat such
as sunshine, fire or the like.
19. Open flame sources, such as lighted candles,
should NOT be placed on the apparatus.
WARNING:
To reduce the risk of fire or electric
shock, do not expose this apparatus to rain or
moisture.
A.
The lightning flash with arrowhead
symbol, within
an equilateral triangle, is
intended to alert the user to the
presence of uninsulated "dangerous
voltage" within the product's enclosure
that may be of sufficient magnitude to constitute a
risk
of electric shock to persons.
A The exclamation point within
an
equilateral triangle is intended to alert
the user to the presence of important
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, pursuant to part
15 of the FCC Rules.
These limits are designed to provide reasonable
protection against harmful interference
in a
residential installation. This equipment generates,
uses, and can radiate, radio frequency ener.gy
and, if not installed and used
in accordance with
the instructions, may cause harmful interference
to radio communications. However, there is no
guarantee that interference will not occur
in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment
off and on, the user is encouraged to try to correct
the interference by one or more of the following
measures:
-Reorient or relocate the receiving antenna.
-Increase the separation between the equipment
and receiver.
-Connect the equipment into an outlet on a
circuit different from that to which the receiver is
connected.
-Consult the dealer or an experienced radio/TV
technician for help.
Changes or modifications not expressly approved
by the party responsible for compliance could void
the user's authority to operate the equipment.
NILES AUDIO CORPORATION - 1-800-BUY-HIFI - 1-7 60-710-0992
3

4
INTRODUCTION
We
call the Sl-1230 a Systems Integration Amplifier because it is a power
amplifier specifically 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 Sl-1230 you'll understand
why
its predecessor, the Sl-1200,
was selected Best New Product 1994
by
Sound & Video Contractor Magazine
and CEDIA (Custom Electronic Design and Installation Association).
In
addition,
the Sl-1200 also won the Consumer Electronics Show's Innovations '95 Design
and Engineering Award.
BRICGABLE
POWER
AMPLIFIERS
I/1NILES.
WWW.
N
I
LESAU
D
I
0.
COM

2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
FEATURES
AND
BENEFITS
REAL
WORLD
POWER
The Sl-1230
is
a 12-channel amplifier 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 efficiently deliver
solid, deep, controlled bass response to a house full
of
speakers.
TWELVE
TO
SIX
CHANNEL
CONFIGURABLE
POWER
Each of the Sl-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 specific locations, such
as
large rooms or outdoor applications.
FREEDOM
FROM
NOISE
AND
CROSS·
TALK
The Sl-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 Sl-1230, the music playing
in
the living room cannot interfere with the music
in
the den.
TRANSPARENT
SOUND
The audio circuitry
of
the Sl-1230
is
constructed with the finest parts available,
including 1
%
metal film 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 flexibility
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 flicking a switch.
BusMatrix™ makes the Sl-1230
an
ideal multi-room or multi-zone amplifier and
offers exciting new features and system design possibilities to the professional
installer.
NILES
AUDIO
CORPORATION-
1-800-BUY-HIFI-
1-760-710-0992
---------
5

6
FEATURES
AND
BENEFITS
CONTINUED
...
INDEPENDENT
LEVEL
CONTROLS
Each amplifier 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 specifically for its location and for who will be
listening!
TURN-ON
MODES
The Sl-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
configure the Sl-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.
WWW.NILESAUDIO.COM

. 2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
SYSTEM
CESIGN
BASICS
As shown
in
Figure 1, a distributed audio/video system
is
defined 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
~one,
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.
Blu-ray
Player
CD
Player
Family
Room
Figure 1
Cable
Box
Living
Room
~----
-----------------------------
·
Listening
Zone
1
·---
------------------------------
NILES
AUDIO
CORPORATION-
1-800-BUY-HIFI-1-760-710-0992
---------
7

8
SYSTEM
DESIGN
BASICS
CONTINUED
...
A
Multilane
system
as
shown
in
Figure
2,
offers the house hold more flexibility.
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.
I • ·
I
I
I
Blu-ray
Player
Family
Room
Listening
Zone
1
·--------
Figure 2
CD
Player
Cable
Box
Living
Room
·-------
Listening
Zone
2
·--------·
WWW.NILESAUDIO.COM

. 2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
SYSTEM
DESIGN
CONSIDERATIONS
SPEAKER
COMPATIBILITY
A single channel (not bridged) of the Sl-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 Sl-1230 is critical when driving lower impedance loads. If the
Sl-1230 is not properly ventilated, the protection circuits may activate and shut
off the channel at higher volume levels (for more information on proper amplifier
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 Sl-1230 is critical when driving a 8 ohm load
with bridged channels. If the Sl-1230
is
not properly ventilated, the protection
circuits may activate and shut off the channel at higher volume levels (for more
information on proper amplifier 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 Sl-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 Sl-1230 terminal to which they are connected. This will make it easier to
reconfigure your system
in
the future.
The Sl-1230 connects to your sources via shielded line level audio cables with
RCA connectors. Use high quality cables with your Niles amplifier for the lowest
possible noise and best overall performance. Your Niles dealer can recommend
the proper cable.
The Sl-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 Sl-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.
NilES
AUDIO
CORPORATION
-l-800-BUY-HIFI-l-760-710-0992
---------
9

10
SYSTEM
DESIGN
CONSIDERATIONS
CONTINUED
...
USING
MONO
FOR
SMOOTHER
COVERAGE
In
large
or
irregularly shaped rooms, you may find that the main listening area
may be closer to one of the speakers. If the speakers
in
the room are connected
to
a stereo amplifier you will only hear half the music. The Sl-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 configure 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
REBUIRE
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 reflect it back to the listener. A pair
of
speakers playing into a large patio or yard will greatly benefit 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 amplifier channels than you would if
you bridged four amplifier channels into
two
and connected the two pairs
of
speakers
in
parallel.
WWW.
N
ILESAU
Dl
0.
COM

. 2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
APPLICATIONS
ADVANTAGES
OF
USING
THE
Sl-1230
IN
A
SINGLE
ZONE
SYSTEM
When you connect the preamplifier outputs of your stereo receiver or stereo
preamplifier
to
the Sl-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 Sl-1230 has its own level control so you can compensate
for architectural differences that create sonic imbalances.
In
addition, you can
fine 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.
Blu-ray
Player
Sl-1230
SERIES
2
Figure 3
CD
Player
II
NILES.
Cable
Box
------------------------------------
-
---------
Single
Zone
·------------
---------------------------
NILES
AUDIO
CORPORATION-
l-800-BUY-HIFI-
l-760-710-0992
---------
11

12
APPLICATIONS
USING
A
DUAL-ZONE
RECEIVER
FOR
TWO
LISTENING
ZONES
Most of today's Dolby Digital Audio Video Receivers include a second zone
preamplifier output to create a second listening zone. Using this output with the
Sl-1230 BusMatrix™ input provides amplification 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.
Blu-ray
Player
!--------------~-
.;.....______.;~
I
I
Zone
'
1
(Home
Theater)
I
I
I
Figure 4
CD
Player
Cable
Box
j
Front Speakers Center Speakers Rear Speakers
.
-----------------------------------------------------------------------
f/1NILES.
Living Room Kitchen Office
Zone2
Bedroom Patio
(Bridged Channels
9-10, 11-12)
WWW.N
ILESAU
D
10.
COM

. 2 CHANNEL, BRIDGABLE POWER AMPLIFIERS
APPLICATIONS
EXPANDING A MULTIZONE SYSTEM TO
INCLUDE MORE ROOMS
In the ultimate MultiZone system, you connect six stereo preamplifiers (or a
single component multi-zone/multi-source preamplifier) to the dedicated inputs
of Sl-1230. These dedicated input signals are then routed to the appropriate
amplifier 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.
I •
Figure 5
CD
Player
Cable
Box
I
I
I
I
I
I
I
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I
Zone 1 - 5 : •
N
Q
:::s
CD
Speaker Outputs f::::::::::::::::::j
~______,.>o...--~~~~...__.,..., / I I N
~----------~: I Q
Niles ZR-6
MultiZone Receiver
Zone6 /
Preamp
Output
(set to fixed) /
Room 1 Room2 Room3
BusMatrixrM
Room4 Room 5
I
------------------ ..
:::s
CD
N
N
Q
:::s
CD
: I~
·---- -------------- ..
I
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.. ------------------.
NILES AUDIO CORPORATION - 1-800-BUY-HIFI - 1-7 60-710-0992 ---------
13

APPLICATIONS
ADDING
PREAMPS
TO
CREATE
MORE
LISTENING
ZONES
In
the ultimate MultiZone system, you connect six stereo preamplifiers (or a single
component multi-zone/multi-source preamplifier) to the dedicated inputs
of
Sl-
1230. These dedicated input signals are then routed to the appropriate amplifier
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.
14
Blu-ray
Player
Q-
= ,.
.J)
Sl-1230
SERIES
2
Zone Outputs
Figure 6
CD
Player
1/JNILES.
/ Dedicated Inputs
II
II
II
II
II
II
Cable
Box
---Zone
1
___
!~---Zone
2
- -
-!~---Zone
3
--
---Zone
4
·
--
---
Zone
5
__
!
~---
Zone
6--
WWW.
N
ILESAU
DI
0.
COM

2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
CONFIGURING
YOUR
SYSTEM
Because the Sl-1230 offers so many configuration possibilities it is important to
plan carefully before you install it. Draw a block diagram of your system and use
the Configuration Worksheet on page
27
to record how you plan to connect your
Sl-1230.
Here
is
an
example
filled
out
according
to
the
block
diagram
on
page
10.
Example 1
BUS INS
&
OUTS CONNECTEDTO
Left Main
Bus
Stereo
Receiver-
2ttd
lotte-
Left
Pre-Output
Right Main
Bus
Stereo
Receiver-
2ttd
lotte-
Right
Pre-Output
Cascade
Output
CH# BRIDGED DIP
INPUT
SOURCE SPEAKER
1 0
L
Maitt
Jus
lotte
1-
Left
2
R
Maitt
Jus
Zottel
-Right
3 0
L
Maitt
Jus
Zotte2
-
Left
4 R
Maitt
Jus
Zotte2
-
Right
5 0
L
Maitt
Jus
ZoneS
-
Left
6 R
Maitt
Jus
ZotteS-
Right
7 0
L
Maitt
Jus
Zotte4
-
Left
8
R
Maitt
Jus
Zotte4
-
Rlg_ht
9
~
10
L
Maitt
Jus
Zotte5
-
Left
11
~
12
R
Maitt
Jus
Zotte5-
Rig_ht
MODE
SETTINGS IN USE SPECIAL
Constant 0
Audio Sense [!{
VoltageTrigger 0
Control
Output
0
NILES
AUDIO
CORPORATION-
1-800-BUY-HIFI-
1-760-710-0992
---------
15

INSTALLATION
CONSIDERATIONS
Automating the turn-on of your Sl-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 preamplifier or receiver. The high power design
of
the
Sl-1230 requires large amounts
of
current from its AC power source. Additionally, it
is always recommended to activate the system preamplifier/receiver before turning
on your Sl-1230
in
order to prevent system "turn-on thumps".
In
order
to
address
these important needs, the Sl-1230 has three special turn-on modes that let you
turn the amplifier 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
amplifier.
In
is "On", Out
is
"Off".
Audio Sense -The master switch on the
front panel must be
in
the "On" position. The
amplifier 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
amplifier channels (i.e. channel 1
&
2 , 3
&
4,
etc.) assigned
to
receive the input signals
will turn on. Once the audio signal stops, the
sensing circuit waits
two
minutes, then turns all
amplifier channels off.
Figure 7
TURN
ON
MODE
AUDIO
SENSE
3-30V
AC/DC
CONSTANT
- -
TRIGGER
INPUT
IMPORTANT!
THE
FRONT
PANEL
POWER
SWITCH
MUST
BE
IN
THE
ON
(SWITCH
IN)
POSITION
FOR
ANY
OF
THE
THREE
TURN-
ON
OPTIONS
TO
FUNCTION
3-24 Volt
Ac/Dc
Opto-lsolated 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 amplifier is turned on. Once the Trigger voltage is turned off,
the sensing circuit instantly turns the amplifier off. The amplifier 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 filter capacitor will
delay the turn-off
of
the amplifier. Trigger sources must be 3-24VAC or DC, 20mA or
greater.
16
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I
2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
INSTALLATION
CONSIDERATIONS
PLACEMENT
Place the Sl-1230 on a flat, 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 Sl-1230, like any hi-fi component, will last much longer if it is given adequate
ventilation for proper cooling. When installing the Sl-1230
in
a cabinet, be sure
that the rear
of
the cabinet is open to fresh air to provide proper cooling (see
Figure 1
0).
If the cabinet's design will not accommodate
an
open
rear,
install
two
small "boxer fans" to provide continuous air flow into and out
of
the cabinet (see
Figure
11
).
Place the Sl-1230 so that there is at least 5" of free air space above
the chassis. If the amplifier
is
located on a carpeted surface, place a board under
the amplifier's feet. Do not block the ventilation holes on the top and bottom
of
the Sl-1230.
The Sl-1230
is
equipped with a digital power transformer. This transformer
generates a powerful magnetic field 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 Sl-1230.
WHHD'.HHHUHH/HHHHHD'D'/HUHHHHAI
Because the surface ofthe amplifier may get hot, it
is recommended that a baffle or screen be placed
above the amplifier to block hand access to the
top surface of the 811230.
Make sure that there is a minimum of 7" of free air
space above the amplifier for proper ventilation.
W~
W.H~
W/H'.H~
W~A!I
• •
Allow a minimum of 2" of depth behind unit
to accommodate cables and connectors.
Boxer
Fan
(55
CFM)
directly centered 7" on
top
of
the Amplifier.
•
I I
Boxer
Fan
(55
CFM)
directly centered 2"
behind the Amplifier.
. F
f
I
If the cabinet rear
is
not open to fresh air or if you're
using low impedance loads, install two "boxer fans"
to
provide continuous air flow into and out of the
cabinet.
NILES
AUDIO
CORPORATION
-l-800-BUY-HIFI-l-760-710-0992
---------
17

FRONT
AND
REAR
PANEL
DETAILS
Sl
•
12
3 0
Systems
Integration
Amplifier®
Main
Bus
Inputs
enable
you
to
route
a
stereo
line
level
source
to
the
BusMatrix
TM
of
the
Sl-
1230
"Turn-OnJJ
Mode
Switch
3.5
mm
Jack
for
1
2v
DC
Control
Input
3.5
mm
Jack
for
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
Bdigital
apparatus
complies
with
Canadian
ICES-003
.
Cet
appareil
numerique
de
Ia
classe
Best conforme a
Ia
norme
NMB-003duCanada.
40MINIMUM
(8
0 MINIMUM
IN
BRIDGED
MODE)
BRIDGED-
~
BRIDGED
+
·~
0
40MJNIMUM
(8
0 MINIMUM
IN
BRIDGED
MODE)
BRIDGED
-
~
BRIDGED+
~
0
1
2v
DC
Control
Output
18
WWW.NilESAUDIO.COM

2
CHANNEL,
BRIDGABLE
POWER
AMPLIFIERS
FRONT
AND
REAR
PANEL
DETAILS
-NILESe
(0
S
TATus)
I
Power
LED
illuminates
to
confirm
the
amplifier
is
connected
to
a
live
AC
power
outlet
and
that
the
master
power
switch
is
on
Bicolor
Status
LEO
illuminates
r
rgreen''
when
the
amplifier
circuitry
has
been
turned
on
by
the
Turn-On
circuits,
and
illuminates
rrredJ(
to
indicate
activation
of
the
amplifier's
built-in
protection
circuitry
Bridging
switches~
BusMatrix
controls,
dedicated
inputs
and
level
controls
for
each
channel
40MINIMUM
(8
0 MINIMUM
IN
BRIDGED
MODEl
BRIDGED
-
i
BRIDGED
+
~
~:Q
7
CLASS
II
WIRING
4QMINIMUM
(8
0 MINIMUM
IN
BRID
G
ED
MODE
)
Dual
banana
spaced
binding
post
for
speaker
connections
Gold-plated
RCA
jacks
4 0
MINIMUM
CAUTION
:
REPLACE
WITH
S
AME
TYPE
AND
(8
0 MINIMUM
IN
BRIDGED
MODE)
RATING
FU
SE
a
.
--~\
BRIDGED
-
i
BRIDGED+
@
~~
.
fj\
FUSE
· 100-120V :T10AL
/2
SOV
~
~
· 220-240V :TSAL/250V
0
~-
Input
voltage
range
selection
switch
Removable
Three-prong
16
gauge
6
1
AC
power
cord
NILES
AUDIO
CORPORATION-
1-800-BUY-HIFI-
1-760-710-0992
---------
19

20
INSTALLATION
LINE
LEVEL
AUDIO
INPUT
CAUTION! The amplifier must be off whenever you make changes to the input
connections.
I
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
Sl-1230.
CASCADE
AUDIO
OUTPUTS
The "Cascade Audio Outputs" enable you
to
connect another amplifier
to
your
preamplifier output. The connectors are gold-plated RCA phono jacks. Connect
them to another amplifier's inputs with a standard audio patch cable. The
outputs are not buffered; if you wish to daisy-chain more than 5 Niles amplifiers
you will need a Niles AVDA-3 buffered distribution amplifier. A single AVDA-3
will allow you to daisy-chain 5 amplifiers from each
of
its six outputs, allowing
30 Sl-1230 power amplifiers to be fed from the same master preamplifier. If your
preamp has a vacuum tube output stage, you must use a Niles AVDA-3 to drive
more than a single Sl-1230.
AC
POWER
PLUG
Be
sure
to
set the AC Input Voltage Selector switch to the voltage range supplied
by your local power source before connecting the AC power cord to the amplifier.
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.
CAUTION!
Do
not
plug
the
amplifier's
cord
into
a
preamplifier's
convenience
outlets.
If
you
use
a
grounded
power
strip,
surge
suppressor
or
extension
cord,
verify
that
proper
ground
is
maintained.
The
Sl-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
Sl-1230's
auto
turn
on
circuitry
to
turn
on
the
Sl-1230
whenever
the
preamp
is
on.
WWW.
N
I
LESAU
D
I
0.
COM