Niles SI-245 Installation & Operation Manual Download Page 19

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SPECIFICA

TIONS

SPECIFICATIONS

Design Principle

Linear voltage/current amplification.

Continuous Average Power Output

45 watts per channel RMS at 8 ohms.
70 watts per channel RMS at 4 ohms.

Input Impedance

22K ohms

Input Sensitivity

.77V for 8

Ω

rated output

Overall Voltage Gain

28 dB

Frequency Response

Bandwidth Limited from 10 Hz to 100 kHz

Total Harmonic Distortion

8 Ohms
.05% THD from 20 Hz to 20 kHz @ full rated power

4 Ohms
.06% THD from 20 Hz to 20 kHz @ full rated power

Overall Dimensions

17” wide 2-5/16” high (including feet) 13-1/8” deep

Weight

15 lbs

Summary of Contents for SI-245

Page 1: ...I N S T A L L A T I O N O P E R A T I O N G U I D E B L E N D I N G H I G H F I D E L I T Y A N D A R C H I T E C T U R E Systems Integration Amplifier ...

Page 2: ...ation you ll enjoy years of trouble free use Niles manufactures the industry s most complete line of custom installation compo nents and accessories for audio video systems For a free full line catalog write Niles Catalog Request P O Box 160818 Miami Florida 33116 0818 1 TABLE OF CONTENTS INTRODUCTION 2 FEATURES AND BENEFITS 3 INSTALLATION CONSIDERATIONS 5 FRONT AND REAR PANEL DETAILS 9 INSTALLATI...

Page 3: ...lifier Niles specifically designs Systems Integration Amplifiers to solve the problems installers face when inte grating different brands and models of equipment into various acoustic environ ments in home theater stereo and background music applications The SI 245 brings extremely high current power to a custom installed A V System in a remarkably convenient way INTRODUCTION 2 SI 245 Systems Inte...

Page 4: ...ur music Current For Reactive Loads The high current design of the SI 245 assures that even unusual and reactive loads are handled with aplomb a massive toroidal transformer with two separate windings one for each of the independent power supplies provides more than ample current to your system Freedom from Fan Noise The oversized heat sinks inside the SI 245 allow the amplifier to stay cool even ...

Page 5: ... occurs the amplifier shuts itself off When conditions return to nor mal regular operation resumes Status Display for Troubleshooting LED s on the front panel indicate Power Active Status and a Protection Warning With a glance at the front panel a troubleshooter is quickly provided with key information Control Output A 12 volt DC output is provided whenever the amplifier is on allowing you to oper...

Page 6: ...out of the cabinet see Figure 2 Place the SI 245 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 SI 245 The SI 245 is equipped with an internal transformer which generates a powerful magnetic field which could induce hum in a tur...

Page 7: ...it waits three minutes then turns the amplifier off 3 30 Volt AC DC Opto Isolated Voltage Trigger The master switch on the front panel must be in the On position The amplifier is off when there is no 3 30V AC or DC volt age detected at the trigger input Once the sensing circuitry detects a voltage and a line level audio signal is detected at the input the amplifier is turned on Once the voltage st...

Page 8: ...eeping spouse These speak er selectors provide an easy way to terminate all of the wires for more than three pairs Testing and troubleshooting a new system is much easier with the individual room labels and on off switches of a Niles speaker selection system Additionally Niles speaker selection systems offer impedance matching features which will allow you to connect up to ten pairs of speakers to...

Page 9: ...verall performance Your Niles dealer can rec ommend the proper cable The SI 245 connects to your speakers using 2 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 binding posts of the SI 245 will accommodate up to 12 gauge wire Larger sizes can be accommodated by attaching banana plugs to the wi...

Page 10: ...e amplifier including the Turn On circuitry The red Protect LED indicates the amp has shut down because there is a fault in a speaker the wiring or with the SI 245 itself Main Inputs enable you to route a stereo line level source to the SI 245 Cascade Outputs of the Main Input enable you to daisy chain multiple amplifiers 3 5mm Mini Plug socket for 12v DC Control output Turn On Mode switch 3 5mm M...

Page 11: ...ng posts for speaker connections IEC receptacle for AC power cord FRONT AND REAR PANEL DETAILS 10 Level Adjustment screws enable you to preset the maximum system volume or match levels with another amplifier ...

Page 12: ...hen the amplifier is active or on When the amplifier turns off the 12 volt sig nal is off 9 Setting The Turn On Mode Switch 9 Control Output 10 Speaker Wire Connections 13 Line Level Audio Inputs 13 Cascade Audio Outputs 14 AC Power plug 17 Rail Fuse Holders 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 ti...

Page 13: ... Dual banana plugs will fit the SI 245 bind ing posts 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 Avoid even a single strand of wire touching the chassis or another connector DESCRIPTION If you label the wires for their destination rather than which terminal of the SI 245 they are connected to it will be easier to ...

Page 14: ...mplifier A single ADA 6 will allow you to daisy chain 5 amplifiers from each of its six outputs allowing 30 SI 245 power amplifiers to be fed from the same master preamplifier If your preamp has a vacuum tube output stage you must use a Niles ADA 6 to drive more than a single SI 245 STEP 1 Label all of the interconnecting cables for the sources they connect to 2 Connect the sources by inserting th...

Page 15: ...e preamp receiver s switched outlet is not rated for a power amplifier DESCRIPTION Just like a computer or printer the SI 245 has an AC cord which unplugs either at the amp or at the wall for your convenience If you use a grounded power strip surge suppressor or extension cord verify that proper ground is maintained The SI 245 draws a maximum of approxi mately 200 watts from an AC wall outlet Use ...

Page 16: ...lifier is operating Protection LED The front panel protection LED indicates that the amplifier has been shut down because of either a fault in the wiring or a speaker or with the SI 245 itself Level Adjustment Screws The front panel level adjustment screws allow you to adjust the level of the SI 245 relative to other amplifiers in your system Use a 1 8 slotted screwdriver to adjust the screws If t...

Page 17: ...rossing from the positive to the negative terminals at the back of the amplifier and or the speaker Short circuit or a break in the speaker wire Dis connect 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 with a meter for continuity Speaker is not working Connect the s...

Page 18: ...ounding in one room POSSIBLE CAUSES AND TEST PROCEDURE Check for faulty cables faulty source material an ungrounded phono system or a defective component AC power cord must be plugged into a working outlet Master power switch must be on The loudspeakers are wired out of phase Reverse the connections at the back of one speaker TROUBLESHOOTING GUIDE ...

Page 19: ...RMS at 4 ohms Input Impedance 22K ohms Input Sensitivity 77V for 8Ω rated output Overall Voltage Gain 28 dB Frequency Response Bandwidth Limited from 10 Hz to 100 kHz Total Harmonic Distortion 8 Ohms 05 THD from 20 Hz to 20 kHz full rated power 4 Ohms 06 THD from 20 Hz to 20 kHz full rated power Overall Dimensions 17 wide 2 5 16 high including feet 13 1 8 deep Weight 15 lbs ...

Page 20: ...rporation Because Niles strives to continuously improve its products Niles reserves the right to change product specifications without notice Niles and the Niles logo are registered trademarks of Niles Audio Corporation Systems Integration Amplifier and BusMatrix are trademarks of Niles Audio Corporation Printed in the USA 12 98 DS00241A ...

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