Niles Audio SI-1260 User Manual

INSTALLATION & OPERATION GUIDE
B LENDING H IGH F IDELITY AND A RCHITECTURE
®
Systems Integration Amplifier
®
®
CONGRATULATIONS!
Thank you for purchasing the Niles SI-1260 Systems Integration Amplifier, one of the most versatile and powerful multi-channel amplifiers ever offered. Like all Niles products, the SI-1260 is built to the highest standards of quality and reliability. With proper installation and operation, you'll enjoy years of trouble-free use.
Niles manufactures the industry's most complete line of custom installation compo­nents and accessories for audio/video systems. For a free full-line catalog write: Niles, Catalog Request, P.O. Box 160818, Miami, Florida 33116-0818 or visit www.nilesaudio.com.
1
TABLE OF CONTENTS
INTRODUCTION 2
FEATURES AND BENEFITS 3
SYSTEM DESIGN BASICS 5
SYSTEM DESIGN CONSIDERATIONS 6
APPLICATIONS 8
CONFIGURING YOUR SYSTEM 13
INSTALLATION CONSIDERATIONS 14
INSTALLATION 16
FRONT & REAR PANELDETAILS 17
OPERATION 23
TROUBLESHOOTING GUIDE 27
CONFIGURATION WORKSHEET 29
SPECIFICATIONS 30
2
INTRODUCTION
Designed for use in high-end/high-powered distributed audio systems, the SI-1260 Systems Integration Amplifier provides a level of performance, flexibility , and ease of installation previously unavailable to custom installers. The SI-1260's unique design enables each of its channels to be independently configured to reproduce stereo or mono in any combination, as well as to compensate for differing volume levels in rooms of different sizes. Additionally, the amplifier's Dual Bus Matrix
feature and multiple inputs enable it to be used in several different applications simultaneously if desired (i.e. mono background music in some rooms and stereo in others).
As you read this manual and become more familiar with the SI-1260's capabilities, you will understand why our multi-channel amplifier design has won many presti­gious industry awards. The first multi-channel amplifier introduced by Niles, the SI­1200, was selected Best New Product in 1994 by both Sound & Video Contractor Magazine and the Custom Electronic Design and Installation Association (CEDIA). In addition, the SI-1200 also won the Consumer Electronics Show's Innovations '95 Design and Engineering Award.
SI-1260
Systems Integration Amplifier
Figure 1
INTRODUCTION
3
FEATURES AND BENEFITS
Microcontroller Based Real World Power
The SI-1260 12 channel amplifier incorporates microcontroller technology which maximizes the amplifier's operational efficiency and enables it to deliver a solid 60 watts per channel into 8 ohms, 20Hz to 20kHz, 0.04% THD. Its power increases to 80 watts per channel into 4 ohms, 20Hz to 20kHz, at 0.06% THD. The massive Multi-T ap Toroid power transformer features 6 independent secondary windings, one for each of the six amplifier modules. This extraordinary power supply design pro­vides the power necessary to deliver solid, deep, controlled bass response to a house full of speakers.
Transparent Sound
The audio circuitry of the SI-1260 is constructed with the finest parts available including the latest in discrete output transistor design, featuring 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.
Microcontroller Based Operation and Protection Modes
The SI-1260 utilizes advanced microcontroller based operation circuitry that moni­tors all facets of the amplifier's operation and protection modes: over/under line voltage, main power fuse status, channel pair on/off status, thermal protection, short circuit/low impedance protection and DC output protection. Additionally, easy to see front panel LED indicators display the operation or protection mode for each channel pair (CH1/2, CH3/4, CH5/6, CH7/8, CH9/10 and CH11/12) as well as for the amplifier's main power supply, providing fast and easy troubleshooting. In the unlikely event that a problem occurs on one channel pair, the other channels will continue to play. When conditions return to normal, regular operation will resume.
Dual Input BusMatrix™Selector
Nile’s unique Dual Input BusMatrix™selector gives you the flexibility to individually assign each amplifier channel to a BusMatrix
input signal, either Left1, Right1, Left1+Right1, Left2, Right2, Left2+Right2, or to a dedicated signal input. With the BusMatrix
, routing surround sound to the master bedroom, stereo to the den, and
mono to a bathroom is as simple as flicking a switch. The Dual Input BusMatrix
makes the SI-1260 an ideal multi-room or multi-zone amplifier, offering the profes­sional installer exciting new features and sound system design possibilities.
FEATURES AND BENEFITS
FEATURES AND BENEFITS
4
Twelve to Six Channel Configurable Power
Each of the SI-1260's six adjacent output pairs are bridgeable. You can create up to six 120-watt channels by setting the bridging switch to the "BRIDGED" position. These switches are located at the top of the rear panel (see Page 21 Figure 16). Bridging enables you to double the power to specific speaker locations, including large rooms and outdoor applications.
Freedom From Noise and Cross-Talk
The unique design of the SI-1260's Dual Input BusMatrix™PC board ensures extremely high channel-to-channel isolation. Signal-to-noise ratio and cross-talk specifications are comparable to those of mixing consoles used in professional recording studios. With the SI-1260, the music playing in the living room will not interfere with the music playing in the den.
Independent Level Controls
Each channel has its own independent volume level control, enabling you to individually adjust the setting for up to twelve different speaker locations for opti­mum audio performance, providing uniform sound in every room.
Turn-On Modes
The SI-1260 features three selectable turn-on modes: (1) manual turn-on via the front panel switch, (2) microcontroller enhanced audio sensing which activates only the appropriate amplifier channels while leaving unused channel pairs off to eliminate cross talk and (3) a 3-30 volt AC/DC voltage trigger input which enables voltage acti­vation. Audio Sense and External Voltage trigger modes enable you to configure the SI-1260 to turn on automatically in any kind of system configuration.
DB25 Audio & Voltage Trigger inputs
The SI-1260 incorporates a DB25 input connector to reduce wiring and installa­tion time when using Niles Systems Integration Electronics. Niles multi-zone pre­amplifiers are equipped with a mating DB25 output connector. This output con­nector provides 6 zones of line-level audio signal output and a 12V Trigger Voltage for reliable amplifier activation.
Designed in the USA
The Niles SI-1260 was designed in the USA by Niles engineers and includes a two year parts and labor warranty.
5
SYSTEM DESIGN BASICS
As shown in Figure 2, 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 (1) source (e.g. CD, Radio, Tape, 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.
A multi-zone system as shown in Figure 3, offers the house­hold 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.
SYSTEM DESIGN BASICS
A Single-Zone System allows only one source to be heard throughout the house at a given time.
Figure 2 - Single Zone System
Figure 3 - Multi-Zone System
CD PLAYER
TAPE PLAYER
RECEIVER
FAMILY ROOM LIVING ROOM
LISTENING ZONE 1
CD PLAYER
RECEIVER
LIVING ROOM
LISTENING ZONE 1
TAPE PLAYER
VCR
VCR
RECEIVER
FAMILY ROOM
LISTENING ZONE 2
TV
TV
SYSTEM DESIGN CONSIDERATIONS
6
SYSTEM DESIGN CONSIDERATIONS
Speaker Compatibility
A single channel (not bridged) of the SI-1260 is capable of driving a low imped­ance speaker load. As many as three eight ohm speakers can be safely connect­ed to a single channel, presenting the amplifier a 2.66 ohm load. Proper ventila­tion of the SI-1260 is critical when driving low impedance loads. If the SI-1260 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 14).
A channel pair that has been BRIDGED is capable of driving an impedance load of 4 ohms. Proper ventilation of the SI-1260 is critical when driving a 4 ohm load with bridged channels. If the SI-1260 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 14).
When designing your system, try to specify 6-8 ohm speakers (Niles offers a com­plete line of in-wall, in-ceiling, outdoor and home theater loudspeakers with all models rated from 6-8 ohms).
Cable and Wire
Because the SI-1260 has many connections on the rear panel (see Figure 13), 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-1260 terminal to which they are connected. This will make it easier to reconfigure your system in the future.
The SI-1260 connects to your sources via shielded line level audio cables with RCAcon­nectors. 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.
A DB25 Multi-Zone Input Connector is provided for use with Niles Multi-Zone Products which include a mating DB25 output connector. All 12 dedicated inputs are included within the single connector, along with the SI-1260's Voltage Trigger Input.
The SI-1260 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-1260'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.
7
SYSTEM DESIGN CONSIDERATIONS
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 SI-1260'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 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 to 120 watts per chan­nel with an 8 ohm impedance.
These are some of the most common Do's 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 . Apair of speakers play­ing into a large patio or yard will greatly benefit from bridging four channels into two 120 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 120 watt channel.
3. More than one pair of 8-ohm speakers (DON'T) - In a large room or a long hall-
way, 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.
8
APPLICA TIONS
Advantages of Using The SI-1260 in a Single Zone System
By connecting a Niles SI-1260 to a stereo receiver's preamplifier outputs, you dedicate a robust 60 watts to each speaker in your multi-room system. Each channel has its own level control, enabling you to compensate for architectural differences which may cause one speaker to seem louder than another. 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.
Figure 4 - Single Zone
APPLICATIONS
DSS VCR CD
Preamplifier or
AM/FM receiver
SI-1260
Niles VCS-2D
Volume Control
Room 1 Room 2 Room 3 Room 4 Room 5 Room 6
Single Zone
9
APPLICATIONS & SYSTEM DESIGN CONSIDERATIONS
Creating a Low-Cost Second Zone Using A Dedicated Source
The main problem in a single zone system is that when a source is being listened to in one room, you cannot listen to another source in another room simultaneously. However, for a listener who only listens to CDs, a low-cost second zone may be cre­ated to allow simultaneous CD listening while the main system is playing another source. This is possible only if the CD player you are using has dual audio outputs, one with remote controllable volume and the other a fixed volume. As shown in Figure 5, you connect the CD player's variable output to the SI-1260's dedicated channel inputs for the particular room where you will listen only to CDs. The fixed output is connected to the main preamp or receiver so you can also listen to CDs in the rest of the house. The finishing touch is to install a Niles infrared repeater system (IRR-4D, IRP-2+ and IRC-2) so you may adjust the CD player's volume via remote control from your CD listening room.
Figure 5 - Low Cost Second Zone for CDs
DSS VCR CD
Niles VCS-2D
Volume Control
BusMatrix Input 1
Preamplifier or
AM/FM receiver
SI-1260
ZONE 1 ZONE 2
(Fixed)
(Variable)
BusMatrix Input 2
IRP-2+
IRC-2
I
FLASHERS
Niles IRR-4D+
IR Sensor
10
APPLICATIONS
Figure 6 - Using a Dual Zone Receiver
Using A Dual-Zone Receiver for Two Listening Zones
Most of today's Dolby Digital surround sound receivers include a second zone pre­amplifier output used to create a second listening zone. Using this output with one of the SI-1260's BusMatrix
inputs provides amplification for multiple rooms within
a second listening zone as shown in Figure 6.
DVD/CD
CHANGER
ZONE 1
(Home Theater)
Front Speakers
BusMatrix Input 1
Niles VCS-2D
Volume Control
Living Room Kitchen Exercise Room Hallway Patio
(Unbridged Channels1-8)
VCR
Dual Zone Surround
Sound Receiver
Center Speaker Rear Speakers
SI-1260
DSS
Second Zone Output
Niles VCS-2D HP
Volume Control
(HP = High Power)
(Bridged Channels
9-10, 11-12)
11
APPLICATIONS & SYSTEM DESIGN CONSIDERATIONS
Adding Preamps To Create More Listening Zones
In the ultimate multi-zone system, you would connect six stereo preamplifiers (or a single component multi-zone/multi-source preamplifier) to one SI-1260, creating six completely independent listening zones. Multi-zone systems enable listeners locat­ed in six separate zones to simultaneously listen to different source components as shown in Figure 7.
DVD/CD
CHANGER
DSS
SI-1260
Niles A4.6Ci
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
Zone Outputs
Dedicated Inputs
AM/FM
TUNER
Figure 7 - Creating More Listening Zones
12
APPLICATIONS & SYSTEM DESIGN CONSIDERATIONS
Utilizing the Dual BusMatrix™Input
Many multi-zone systems incorporate multiple rooms within a single zone. The SI-1260’s Dual BusMatrix
Input simplifies the connections required for this system design. As shown in Figure 8, a Niles A4.6Ci Multi-zone Controller has its first and second zone outputs connected to the SI-1260’s Dual BusMatrix
#1 and #2 inputs respectively. Bus Input #1 is then routed to amplifier channels one through six via dip switch settings. Bus Input #2 is routed to amplifier channels seven through twelve in the same manner. Six rooms can now be connected to the SI-1260 placing three rooms in Zone #1 and three rooms in Zone #2. The remain­ing zone outputs on the A4.6Ci can be connected to another SI-1260 for more zones.
Figure 8 - Dual BusMatrix™Input
ZONE 2
DVD/CD
CHANGER
SI-1260
Zones 1-2
AM/FM TUNER
SI-1260
Zones 3-6
BusMatrix Input 2
DSS
Niles A4.6Ci
BusMatrix Input 1
Niles VCS-2D
Volume Control
ROOM 1 ROOM 2 ROOM 3 ROOM 4 ROOM 5 ROOM 6
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
13
CONFIGURING YOUR SYSTEM
CONFIGURING YOUR SYSTEM
The SI-1260 offers many configuration possibilities. Therefore, carefully plan the installation before starting. Start by drawing a block diagram of your system and use the Configuration Worksheet on page 29 to document how you plan to connect your SI-1260. Figure 9, shown below, is an example of a Configuration Worksheet filled out according to the block diagram (figure 6) on page 10.
BUS INPUTS & OUTPUTS CONNECTED TO. . .
Left Bus Input # 1 Second Zone Left Output Right Bus Input # 1 Second Zone Right Output Left Bus Input # 2 N/S Right Bus Input # 2 N/S Cascade Output Bus # 1 Right N/S Cascade Output Bus # 1 Left N/S Cascade Output Bus # 2 Right N/S Cascade Output Bus # 2 Left N/S
CH # BRIDGED DIP INPUT SOURCE SPEAKER
1
L1 Bus #1 Left Living Room
2 R1 Bus #1 Right Living Room
3 L1 Bus #1 Left Kitchen 4 R1 Bus #1 Right Kitchen 5 L1 Bus #1 Left Exercise Room 6 R1 Bus #1 Right Exercise Room 7 L1+R1 Bus #1 Hallway #1 8 L1+R1 Bus #1 Hallway #2 9 Off N/S N/S 10 L1 Bus #1 Left Patio
11 Off N/S N/S 12 R1 Bus #1 Right Patio
MODE SETTINGS IN USE SPECIAL CONNECTIONS OR NOTES
Constant
Audio Sense Voltage Trigger Control Output
Sample Configuration Worksheet
✓ ✓
Figure 9
14
INSTALLATION CONSIDERATIONS
INSTALLATION CONSIDERATIONS
Automating the turn-on of your SI-1260 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 SI-1260 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 SI-1260 in order to prevent system “turn-on thumps”. In order to address these important needs, the SI-1260 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 Turn­On Mode selector switch (see Figure 10).
Important! The Front Panel Power Switch must be in the ON (switch in) position for any of the three turn-on options to function (refer to page 23 for more information concerning the Front Panel Power Switch).
Turn-On Modes
Constant: The auto turn-on circuitry is "OFF". The front panel master power switch operates the amplifier. When the switch is in, the amp is "ON", when it is out, the amp is "OFF".
Audio Sense: The amplifier is "OFF" when there is no audio signal present at any of the 16 inputs, but the sensing circuitry is active. The turn-on sensing circuitry looks for a tiny amount of audio 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, 5/6, etc.) assigned to receive the input signals will switch "ON". Once the audio signal stops, the sensing circuit waits approximately 2-minutes, then switches all amplifier channels "OFF".
3-30V AC/DC Trigger Input: The amplifier is "OFF" when a 3 to 30-Volt AC or DC signal is not applied to the voltage trigger input. Once the sensing circuitry detects such a voltage, all adjacent pairs of amplifier channels that are receiving an audio signal switch "ON". Once the voltage is removed, the Voltage Trigger circuit instant­ly switches the amplifier "OFF". Voltage triggers may be supplied by Niles automat­ed switchers, some video projectors, some surround sound processors, or a 12 Volt DC wall adapter (Niles FG00665) plugged into the switched outlet of your stereo receiver.
If you are using a wall adapter or external power supply to provide the trigger, it doesn't have to be very large (a minimum current capability of 2.5-milliamps for a 3 Volt trigger increasing up to a minimum of 38 milliamps for a 30-Volt trigger).
Figure 10 - Turn-On Mode.
15
INSTALLATION CONSIDERATIONS
If the cabinet rear is not open to fresh air or if your using low impedance loads, install two “boxer fans” to pro­vide continuous air flow into and out of the cabinet.
Make sure that there is a minimum of 6” of free air space above the amplifier and 1” on each side for proper ventilation.
Allow a minimum of 2” of depth behind the unit to accommodate cables and connectors .
Figure 11
Figure 12
Placement
CAUTION! Placing the SI-1260’s weight on the rear or front panels will cause dam­age to the amplifier’s connectors or controls.
Place the SI-1260 on a flat, level surface like a table or shelf. The SI-1260 must be placed with its weight equally distributed on the unit's four feet. This amplifier, like any high-fidelity component, will last much longer if it is given adequate ventilation for proper cooling. When installing the SI-1260 in a cabinet, be sure that the cabi­net's rear is open to fresh air (see Figure 11). Additionally, place the SI-1260 so that there are at least 6 inches of free air space above the amplifier and 1 inch on each side. If the amplifier is located on a carpeted surface, place a board under the ampli­fier's feet. 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 12).
CAUTION! When using low impedance speaker loads (less than 4 ohms Normal Mode, less than 8 ohms Bridged Mode), refer to figure 12 for proper placement.
CAUTION! DO NOT block the ventilation holes on the top and bottom of the SI-
1260.
The SI-1260 is equipped with a massive toroidal power transformer. This transformer generates a powerful magnetic field that could induce a 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-1260.
CAUTION! Before placing the SI-1260 on a shelf, verify that the weight bearing capacity of the shelf is 70 lbs or greater.
Boxer Fan (105 CFM) directly centered 2” behind the SI-1260.
Boxer Fan (105 CFM) directly centered 6” on top of the SI-1260.
16
INSTALLATION
Line Level Audio Inputs
Caution! The amplifier must be off whenever you make changes to the input con­nections.
Cascade Audio Outputs
The "Cascade Audio Outputs" enable you to connect additional amplifiers to your preamplifier's output. Connection is accomplished with standard RCA interconnect cables. The outputs are not buffered; to daisy chain more than five Niles amplifiers you will need a Niles AVDA-3 buffered distribution amplifier. A single AVDA-3 enables you to daisy chain five amplifiers from each of three outputs. This allows 15 SI-1260 power amplifiers to be fed from the same master preamplifier. If your pre­amplifier has a vacuum tube output stage, you must use a Niles AVDA-3 to drive more than one SI-1260.
AC Power Plug
STEP
1. Correctly label the interconnecting cables coming from each source.
2. Connect the sources by inserting the RCA connectors into a BusMatrix
input or dedicated input jack on the SI-1260's rear panel.
NOTE: When you are using two ampli­fier channels in the "bridged" mode, assign the audio signal to be ampli­fied to the EVEN numbered amplifier channel using the BusMatrixDip Switches.
DESCRIPTION
Use audio patch cables terminated with RCA connectors.
Connect outputs from your source compo­nents to the input jacks on the amplifier. NEVER connect a preamplifier or source input (e.g., record inputs) to the SI-1260 inputs.
STEP
1. Plug the SI-1260’s attached 2 prong
power cord into a correctly grounded 120 Volt, 60-Hz wall outlet.
CAUTION! DO NOT PLUG THE SI-1260'S POWER CORD INTO A PREAMPLIFI­ER'S CONVENIENCE OUTLET.
DESCRIPTION
If you use a grounded power strip, surge protector, or extension cord, verify that the proper ground is maintained
1. The SI-1260 draws a maximum of about 890 watts from an AC wall outlet. This is much more than the typical accessory outlet on a component's rear panel can provide.
2. Use the SI-1260's auto turn-on circuitry to switch "ON" the SI-1260 when the preamplifier is "ON".
INSTALLATION
17
Red “Power” LED confirms the amplifier is connected to a live AC
outlet and that the front panel switch is on. Additionally, it indicates
any AC line voltage problems and main power fuse status.
Front panel “Master Power” switch turns off the entire amplifier, including the auto turn on circuitr
y.
3.5mm Jack for
12v DC Control Output.
(150 mA max)
3.5mm Jack for 3-30V AC/DC trigger input.
“Turn- On” Mode Switch.
Gold Plated Dual Bus Inputs, selectable by the BusMatrix™, provide enhanced input flexibility.
Cascade outputs of the bus input enable you to daisy chain multiple amplifiers.
FRONT AND REAR PANEL DETAILS
Figure 13
BusMatrix™ controls for each
channel.
Level controls for each
channel.
18
Attractive extruded
aluminum front panel.
Multi-color “Channel Pair” LED indicators
display channel pair on/off status,
and protection modes.
Gold plated, dual banana plug
spaced, five-way speaker
binding posts.
Removable Two-prong
IEC compatible
AC power cord.
Bridging switch for each channel pair.
Gold-plated RCA jacks for the
dedicated inputs.
Serial Number.
DB-25 input connector for simplified dedicated
audio and voltage trigger connection using
Niles Multi-Zone Products.
FRONT AND REAR PANEL DETAILS
19
INSTALLATION
Bare Wire
Unscrew the red or black plastic knobs and insert the bare wire through the hole in the post. Tighten the knob until the wire is secure­ly clamped.
STEP
1. Label all wires.
2. Connect one stripped wire end or banana plug to the black terminal and one to the red terminal.
CAUTION! NOT EVEN A SINGLE STRAND OF WIRE CAN BE ALLOWED TO TOUCH THE AMPLIFIER CHASSIS OR ANOTHER CONNECTOR.
DESCRIPTION
If all wires connecting to the SI-1260 are labeled with their destination rather than their specific connection to the SI-1260, it will be easier to reconfigure the system in the future.
A. Split the speaker wire insulation at least 2 inches.
B. Strip 1/2 inch of insulation from each speaker wire conductor.
C. Attach banana plugs or twist the wire strands of each conductor and insert them into the appropriate SI-1260 binding post.
Banana Plugs
There are many types of banana plugs available. Some are crimped onto the speaker wire and some are soldered. Niles offers banana plugs that have a quick-connect binding system for the speaker wire included within the banana plug itself. After the wire is attached, the banana plug is simply inserted into the hole at the end of the amplifier's speak­er binding post. Dual spaced banana plugs will fit the SI-1260 bind­ing posts.
Speaker Wire Connections
CAUTION! All speaker wire connections must be made with the amplifier OFF.
Figure 14 - Binding Posts
20
INSTALLATION
BusMatrix™Input DIP Switch Settings
Each channel has a dedicated BusMatrix™DIP switch bank that assigns that chan­nel's source input signal (see Figure 15). To assign the BusMatrix
source input sig-
nal for a particular channel, set only one
of the seven switches to the right.
Again, only one of the seven DIP switches should be configured to the "ON" position (switched to the right).
STEP
1. Move only one (1) DIP switch to the "ON" position for each channel.
DESCRIPTION
CAUTION! EACH DIP SWITCH ALLOWS YOU TO MOVE ALL SEVEN SLIDE SWITCHES TO THE "ON" POSITION. IF YOU SET MORE THAN ONE SLIDE SWITCH TO "ON" YOU MAY CREATE AN UNDESIRABLE MIX OF INPUTS ON THE ENTIRE BUS.
“ON” Position“OFF”Position
DIP Switch Settings
1L is for the assignment of the Left Bus Input #1 1R is for the assignment of Right Bus Input #1 1L+1R is for the assignment of a summed mono signal of the Left and Right Bus Input#1 2L is for the Left Bus Input #2 2R is for the Right Bus Input #2 2L+2R is for a summed mono signal of the Left and Right Bus Input #2 The seventh switch assigns the dedicated input to its respective channel
Figure 15 - BusMatrix™DIP Switches
21
Bridging Two Channels into One
The SI-1260's bridging switches allow you to create a more powerful amplifier chan­nel by combining or "bridging" two adjacent amplifier channels together into one.
Slide the bridg­ing switch in the direction of the arrow to bridge two adjacent amplifier chan­nels. Set the controls of the newly bridged pair by using the EVEN numbered channel.
When two channels are bridged
together, connect speakers to the
two terminals labeled “Bridged”.
STEP
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 4 OHMS TO A BRIDGED CHANNEL.
2. Connect the speaker wires to the two bridged speaker terminals (BRIDGED+, BRIDGED-). Carefully observe the polarity markings.
CAUTION! DO NOT CONNECT A HEADPHONE JUNCTION BOX TO THE OUTPUT OF A BRIDGED CHANNEL PAIR.
3. Use the EVEN NUMBERED BusMatrix
switch bank and level control for the adjustments and configuration of a bridged channel.
DESCRIPTION
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. Channel 2 and 3 are not a pair and cannot be bridged.
Each bridged channel is designed for a 4 ohm minimum load. Connecting multiple speakers to a single channel, creating a nominal impedance of less than 4 ohms may cause the SI-1260 to go into protection mode or be damaged.
Connect the speaker wires to the two adja­cent amplifier channel's RED terminals only. NOTE: If one of the speaker wires touches a BLACK terminal, you will short-circuit the amplifier.
These connections to a bridged channel pair will cause either thermal shutdown or poor quality sound.
When two channels are bridged into one, ensure that the odd numbered DIP switches are all in the "OFF" position.
Figure 17 Bridged Channel Connections
Figure 16 Channel Bridging Switch and DIP Switches
INSTALLATION
22
Setting the Turn-On Mode Switch
The SI-1260 has three (3) turn-on modes. Select the desired mode by sliding the mode switch to the proper position. See Installation Considerations on page 14 and Figure 10 for more information about each of the turn-on modes.
The Control Output
As shown in Figure 19, a 3.5 mm female mini­plug output jack on the rear panel of the SI-1260 provides a 12V DC trigger signal. It is suitable for triggering Niles automated switchers, some motorized screens and electric curtain controls and other devices that require a constant 12V DC control voltage for activation.
This voltage is provided only when any of the amplifier channels are active or "ON". When all amplifier channels are "OFF", the 12V signal is "OFF".
Slide the switch with either your fingernail or a 1/8” slotted screwdriver blade.
Using the
3.5mm jack.
STEP
1. Check the requirements of the device you want to control.
2. Connect the 3.5mm jack to the control output maintaining proper polarity (tip = +)
DESCRIPTION
The control output provides 150 mA of current maximum.
Niles makes an accessory cable plug FG00724.
INSTALLATION
Figure 18
Figure 19
23
OPERATION
Front Panel Power Switch
The SI-1260's master power switch is located on the front panel. Pressing the switch toggles between the ON (switch in) and the OFF (switch out) position. It must be in the ON position to enable the amplifier to activate regardless of the turn-on mode selected (see page 14). If you are going on vacation and/or would like to reduce power con­sumption while you are away, set the master power switch to the OFF position. When you would like to return to normal operation, set the switch back to the ON position.
Power LED Indicator
The SI-1260 features a bi-colored POWER LED indicating the power status of the amplifier:
OFF
Solid Yellow
Solid Red
Fast Red Blinking
(Three Times Per Second)
Slow Red Blinking
(Once Every Three Seconds)
Amplifier is not plugged in to a live AC outlet. The amplifier is plugged into a live AC outlet and the main
power switch is OFF (out position).
The amplifier is plugged into a live AC outlet and the main power switch is ON (in position).
The AC line voltage is above or below the normal 120VAC. This will cause the amplifier to turn off.
Normal operation resumes once the AC line voltage returns to 120VAC.
Internal defect. The amplifier should be returned to Niles for service.
POWER LED
STATUS
OPERATION
24
Channel Pair LED Indicators
The SI-1260 incorporates individual multi-colored LEDs for each channel-pair that indicate the following:
OFF
Solid Green
Fast Red Blinking
(Three Times Per Second)
Slow Red Blinking
(Once Every Three Seconds)
Solid Red
The channel pair is OFF. The channel pair is active and operating normally.
Indicates a possible short circuit or low impedance condition. Speaker wire strands that are touching at the speaker or the ampli­fier's speaker terminals and/or a damaged speaker wire can cause a short circuit. More than three pairs of 8 ohm speakers attached to the same amplifier channel present the amplifier channel with a low impedance. Both of these conditions will cause the LED indi­cator to blink red very quickly. Eliminating the short cir cuit or con­necting a proper speaker impedance load will enable the channel pair to resume normal operation.
Indicates the channel pair is overheating due to inadequate ventilation. Providing proper airflow to the amplifier will eliminate this problem (refer to page 15, figures 11 and 12 for amplifier placement details).
There is a damaged internal component in this channel pair module. The amplifier should be returned to Niles for service.
CHANNEL PAIR LED
STATUS
OPERATION
25
Using Level Controls as Limiters
Using the individual level controls, the SI-1260 enables you to set a specific volume level for each of the different rooms connected. Individual room volume levels can be calibrated so that all rooms have similar volume control characteristics regard­less of size and acoustics and to establish a maximum volume level. This is espe­cially useful if your system is remote controlled, or if some of the users like to play the stereo too loudly.
Calibrate your system's volume levels using the steps outlined below:
1. Adjust all of the SI-1260's level controls to the minimum volume position. If there are any other amplifiers in the system, adjust their level controls to the minimum. (All of the amplifiers in your system must have level controls).
2. Adjust all individual in-wall volume controls to the loudest setting (fully clockwise).
3. Play a loud radio station.
4. Increase the preamplifier or receiver's volume up slowly. If you hear any sound, lower the preamplifier's volume again and recheck all amplifier levels, they must be at minimum. If no sound is heard when the preamplifier is turned all the way up, proceed to step five.
5. Have someone step into each room and listen as you adjust each level control on the SI-1260 to the desired maximum level for that room.
6. Adjust the volume for each channel to achieve a good balance from the most used lis-
tening position in each room.
OPERATION
26
Listening at Higher Volumes
An output of 60 watts is adequate power to completely drown out conversation in a normal sized room. Even at those levels, the SI-1260 will sound clear and clean. Obviously, it requires more power to achieve a reasonable volume of sound in a large room than it does in a small room. Even if you are normally very careful, it is possible to turn the volume so high that the amplifier runs out of power. This cre­ates "clipping" distortion.
Clipping distortion makes treble sound very harsh and unmusical. If you hear harsh sounding treble from any speakers, immediately turn down the level controls for the channel pairs connected to those speakers. These harsh sounds include power­ful high frequency sound spikes that will quickly damage the tweeter of any loud­speaker.
If you continue to operate the amplifier at "clipping" power levels the protection circuits will operate. The protection circuits will reset when output signal condi­tions have returned to normal. Perpetually over-driving your speakers and amplifier is abuse and will void the manufacturer's warranty on all affected products.
Cleaning and Maintenance
The internal parts of the SI-1260 are electronic and require no maintenance. Once a year it is appropriate to twist each input RCA connector to remove any oxidation and improve conductivity.
You can clean the amplifier with soft cloth or a paper towel dampened with water.
DO NOT use any spray-type or abrasive cleaners on the amplifier.
OPERATION
27
TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
When a problem occurs, consult this guide first. 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 are related to hook-up. Have your configuration worksheet handy when you call.
SYMPTOM
Very low or no sound on one channel.
No sound on one channel pair and channel pair LED is quickly blinking red.
No sound on one channel pair and channel pair LED is slowly blinking red.
No sound on one channel pair and channel pair LED is solid red.
POSSIBLE CAUSES AND TEST PROCEDURE
1. BusMatrix™DIP switch is not in the correct position. Check your configuration worksheet and verify all settings.
2. Audio cable to the input is bad. Connect the non­working channel to a cable known to be good.
3. Bridging Switch is in wrong position. Check your con­figuration worksheet for the correct setting and verify.
1. Check that connections are secure and that there are no loose strands of wires crossing from the positive to the negative terminal at the back of the amplifier and/or the speaker.
2. Disconnect the speaker wire at both ends; separate 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 for continuity.
3. Verify that the impedance load of the connected speakers is not less than 2.66 ohms with an unbridged channel and 4 ohms with a bridged channel.
The amplifier module has overheated due to inadequate ventilation or prolonged operation at clipping levels.
1. Turn the amplifier off and allow the internal circuits to cool.
2. Check to ensure that there is sufficient ventilation for the amplifier. After a reasonable time has passed, turn the amplifier back on and check the LED again.
3. Lower the level controls for that channel pair.
The amplifier module requires service. Contact your Niles dealer for service information.
28
TROUBLESHOOTING GUIDE
Very low or no sound on some or all channels.
Hum from all of the speakers.
Sound is distorted on one or more channels at normal volume.
No sound on any channels and power LED is slowly blinking.
Bass is weak and stereo sound is "phasey".
A speaker connected to a bridged pair of amplifier channels sounds weak.
1. Bridging Switch is in wrong position. Check your con­figuration worksheet for the correct setting and verify.
2. Audio cable to the input is bad. Connect a cable known to be good to the non-working channel.
Hum can be caused due to a ground potential differ­ence between connected components (especially those connected to antenna or cable TV feeds).
1. Check for faulty cables; faulty source signals; an ungrounded phono system, cable feed, and/or a defective component.
2. Reverse the AC plug of components with non-polar­ized plugs.
3. Test the AC receptacle using a Ground Tester.
1. DIP switch(es) are not in the correct position(s). Check the worksheet and verify all settings.
2. If the channel pair LED is Yellow, then the channel is being overdriven (volume set too high on the pream­plifier). The channel volume level should be re-cali­brated to avoid this condition (refer to page 25 for infor­mation on Using Level Controls as Limiters).
Amplifier has an internal defect requiring service.
Contact your Niles dealer for service information.
1. 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 be out of phase.
2. The speakers are wired out of phase. Recheck polar­ity and reverse the connections on the back of one speaker if necessary.
Check that the Bridging Switch is "ON".
POSSIBLE CAUSES AND TEST PROCEDURE
SYMPTOM
CONFIGURATION WORKSHEET
CONFIGURATION WORKSHEET
BUS INPUTS & OUTPUTS CONNECTED TO. . .
Left Bus Input # 1 Right Bus Input # 1 Left Bus Input # 2 Right Bus Input # 2 Cascade Output Bus # 1 Right Cascade Output Bus # 1 Left Cascade Output Bus # 2 Right Cascade Output Bus # 2 Left
CH # BRIDGED DIP INPUT SOURCE SPEAKER
1 2 3 4 5 6 7 8 9 10 11 12
MODE SETTINGS IN USE SPECIAL CONNECTIONS OR NOTES
Constant
Audio Sense Voltage Trigger Control Output
29
SPECIFICATIONS
Design Principle
Linear voltage/current amplification.
Continuous Power Output (FTC Rated)
(Unbridged, all channels driven) 60 watts per channel at 8 ohms, 80 watts per channel at 4 ohms.
Bridged Power Output
(Adjacent channels bridged, all channels driven) 120 watts per channel at 8 ohms.
Input Impedance
47,000 ohms
Input Sensitivity
100mv for 1 watt out; 850mv for full output, (60 watts) level controls set at maximum.
Overall Voltage Gain
29 dB
Frequency Response
Bandwidth from 5 Hz to 50 kHz
Distortion
(Normal mode)
0.06% THD 20Hz to 20kHz all channels driven (8 ohms)
0.06% THD rated 20Hz to 20kHz all channels driven (4 ohms)
(Bridged mode)
0.06% THD 20Hz to 20kHz all channels driven (8 ohms)
Overall Dimensions
17 inches wide by 7.375 inches high (including feet) by 15 inches deep.
Weight
70 pounds
SPECIFICATIONS
30
Niles Audio
Corporation
12331 S.W. 130 Street
Miami, Florida 33186
Tel: (305) 238-4373
Fax: (305) 238-0185
www.nilesaudio.com
© 2000 Niles Audio Corporation. All rights reserved. Niles, the Niles logo, Blending High Fidelity and Architecture, and Systems Integration Amplifier are registered trademarks of Niles Audio Corporation. BusMatrix is a trademark of Niles Audio Corporation. All other trademarks are the property of their respective owners. Because we constantly 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 Taiwan. 06/00 DS00257A
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