Infinity Reference 475a High Peformance 4-Channel Full-Range Amplifier (Silver/Black)

Infinity Reference Series Amplifiers Looking for a more moving audio experience? Take Infinity car audio for a ride. Innovative materials and breakthrough engineering have always put Infinity products out in front of the competition. So expect extreme output from Reference Series amps, but be prepared for accuracy and detail that may surprise you. There is no better way to make your car audio system stand up and deliver than by powering your speakers and subs with Infinity electronics.

4-Channel full-range amplifier with on-board electronic crossover and variable bass boost. Click to enlarge.

Infinity 475a Features

Class D Subwoofer Amps
Efficiency is the benefit of the Infinity Reference Series Class D subwoofer amplifiers. A higher percentage of the power the amp extracts from the car's charging system is converted into output to the speakers, and less is wasted as heat. That is really important if you're trying to provide power to a 1000-watt amplifier. Class D technology turns the analog input signal into a series of pulses that can be amplified more efficiently by transistors used as switches, rather than valves. They're either on and operating at their most efficient level, or they're off. The pulses are converted back into an analog signal by an output filter.

CEA-2006-Compliant
All Infinity amplifiers are tested in accordance with CEA-2006, which provides a testing procedure to help customers compare amplifiers accurately--apples to apples. Specs are based on industry-accepted standards, rather than on the whims of amplifier companies' marketing departments. Look for the CEA-2006 logo when comparing amplifiers, to be sure you're getting the power you're paying for.

Audiophile-Quality Full-Range Amplifiers
Class AB full-range amplifiers offer audiophile quality performance and the best compromise between efficiency, low distortion, maximum available headroom and output power.

Amps That Don't Break
Infinity amplifiers are tested according to the strictest and most demanding reliability-testing regimen ever designed for car audio amplifiers. They are shaken, baked, frozen, dropped and shocked--all while they're operating. When they've passed all these tests, they are tested again. The result is a series of amplifiers that just don't break.

DBO Bass-Optimization Circuit
provides superior control and adjustability, compared to traditional bass-boost. DBO is a 2nd order high-pass filter that can be adjusted between 20Hz and 80Hz. The boost (or Q) adjustment boosts the signal above the highpass filter frequency. Used with a sealed box, it can help to increase output for more "fun" if it's set to about 45Hz. If it's used with a vented box, it should be set at or slightly below the tuned frequency of the box. That will prevent woofer unloading, and provide more output at the frequency where the box is tuned and the woofer's excursion is minimized--where it can handle more power.

Onboard Electronic Crossovers
Reference Series amplifiers include 2nd order (12dB/octave) slopes and are continuously variable from 32Hz to 200Hz.

Variable Bass-Boost
Provides up to 12dB of boost at 50Hz in the Reference Series full-range amplifiers.

Direct-Connect Terminals
Eliminate the need for additional solder-on or crimp-on terminals and provide an easy and reliable connection for power, ground and speaker wires.

Full-Range Preamp Outputs
Eliminates the need for signal splitters.

Infinity 475a Specifications

About Infinity

What's in the Box

Infinity Amplifier Options

Infinity Reference 1300a Mono Subwoofer Amplifier	Infinity Reference 1600a Mono Subwoofer Amplifier	Infinity Reference 5350a 5-Channel Amplifier	Infinity Reference 475a 4-Channel Full-Range Amplifier