Niles Audio Car Amplifier SI 250 User Manual

SYSTEMS INTEGRATION AMPLIFIER®  
2-CHANNEL BridgEABLE POWEr AMPLiFiEr  
SI  
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Offering the classic Niles stability that you’ve come to know and trust, the powerful SI-250 brings extremely high current  
power to a custom installed A/V System in a remarkably convenient way. Featuring audio circuitry constructed using the  
finest materials available, including 1% metal film resistors, high quality capacitors and oversized heat sinks that ensure  
proper cooling without the need for a noisy fan. This 2-channel amplifier provides 50W per channel (225W when bridged  
for higher output applications) and independent level control, making installation easier and more straight forward than  
ever before.  
Features & beneFits  
Real World Power The SI-250 delivers 50 watts per  
channel at 8 ohms and 100 watts per channel at 4  
ohms. You’ll get tremendous bass and dynamics from  
every pair of speakers connected.  
Freedom from Fan Noise The oversized heat sinks  
inside the System Integration Amplifiers allow the  
amplifier circuitry to stay cool even when operating  
into low impedance loads without the distracting noise  
created when using fan-cooled amplifiers.  
Turn-On Modes The Niles SI-250 Amplifier features  
three turn-on modes: 1. Music Sense, 2. External  
Voltage Trigger, 3. Manual Turn-On via the front panel  
switch. You can configure the Niles SI-250 Amplifier  
to interface with any kind of system and have the unit  
automatically turn on.  
Current for Reactive Loads The high current design  
of the Niles SI-250 Amplifier assures that even unusual  
and reactive loads are handled with ease. Cutting edge  
digital power supplies provide more than ample current  
to your system.  
Bridged Mode The Niles SI-250 Amplifier can be  
operated in a bridged mono configuration. In this  
configuration, the SI-250 delivers 225 watts. Bridged  
mode is perfect for subwoofer, rock speakers or any  
applications requiring high power output.  
Freedom from Cross-Talk The Niles SI-250 Amplifier  
is powered via its own independent power supply.  
This increases the isolation between channels and  
eliminates cross talk, guaranteeing you absolute silence  
as the backdrop to your music.  
Independent Level Controls Each amplifier channel  
features an independent level control enabling precise  
volume matching to the rest of the system. These level  
controls can also limit volume to prevent abuse of the  
system.  
Control Output A 12 Volt DC output is provided  
whenever the amplifier is on, allowing you to operate  
voltage triggered devices like motorized screens and  
curtains.  
®
Bl e n d i n g Hi g H Fi d e l i t y An d Ar c H i t e c t u r e  
 

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