Infinity Reference 475a High Performance 4-Channel Full-Range Amplifier (Silver/Black)
Infinity's Reference 475a is a 4-Channel full-range amplifier with on-board electronic crossover and variable bass boost. Features include a high-output PWM MOSFET power supply for optimum power delivery into numerous impedances with low distortion, full-range preamp outputs for multiple amplifier hookups without the need for costly Y-adapters or signal splitters, a variable 12dB per octave electronic crossover allowing you to optimize system tuning based on speaker location and accompanying loudspeaker components, and plenty more.Infinity Reference Series AmplifiersLooking 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 FeaturesClass D Subwoofer AmpsEfficiency 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-CompliantAll 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 AmplifiersClass 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 BreakInfinity 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 Circuitprovides 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 CrossoversReference Series amplifiers include 2nd order (12dB/octave) slopes and are continuously variable from 32Hz to 200Hz.Variable Bass-BoostProvides up to 12dB of boost at 50Hz in the Reference Series full-range amplifiers.Direct-Connect TerminalsEliminate 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 OutputsEliminates the need for signal splitters.Infinity 475a SpecificationsPower Output:75 watts RMS x 4 channel at 4 ohms and less than or equal to 1% THD + N 180 watts RMS x 2 channel at 4 ohms, 14.4V supply and less than or equal to 1% THD + NSignal-to-Noise Ratio:85dBA (reference 1 watt into 4 ohms)Dynamic Power:117 watts at 2 ohmsEffective Damping Factor:6.315 at 4 ohmsFrequency Response (-3dB):10Hz to 100kHz (-3dB)Maximum Input Signal:6VMaximum Sensitivity:100mVDimensions (L x W x H):14-3/16 x 9 x 2-11/16 inches (360 x 229 x 68 mm)About InfinityInfinity was founded in 1968 on a unique blend of technology, performance, and design. Today, Infinity offers three tiers of automotive speakers comparable to the best home-audio components. Infinity Kappa Perfect, Kappa, and Reference Series speakers deliver performance that rivals the best the competition has to offer.What's in the BoxInfinity Reference 475a 4-Channel Full-Range Amplifier (Silver/Black), Mounting Hardware, Fuses, User's ManualInfinity Amplifier OptionsInfinity has approached the amplifier category with the objective of delivering maximum CEA-rated power with all the right features to get the job done. Infinity's Reference amps simply deliver.Infinity Reference 1300a Mono Subwoofer AmplifierInfinity Reference 1600a Mono Subwoofer AmplifierInfinity Reference 5350a 5-Channel AmplifierInfinity Reference 475a 4-Channel Full-Range Amplifier