Product Description
The Infinity Reference 475a is a 4-Channel Full Range Amplifier capable of driving 2 sets of speakers. It has a built in 12db variable electronic crossover as well as a variable bass boost of 0 to 6db at 50Hz. The amplifier can drive four channels at 2 ohms with 90 Watts RMS. It can also be configured to drive two channels at 4 ohms with 180 Watts of power. The amplifier has a very attractive low profile. This amplifier comes with a one year parts and labor warranty. Infinity Systems is a leader in loudspeaker design for both car and home speaker systems and is part of Harman International.
| List Price: | $279.95 |
| Price: |
$179.95 & eligible for FREE Super Saver Shipping on orders over $25. Details |
| as of Fri, 22 Feb 2013 07:48:13 GMT ***Remember, deals price on this item for sale just for limited time*** | |
Product Details
- Color: Silver/Black
- Brand: Infinity
- Model: Infinity Reference 475a
- Dimensions: 2.68" h x 2.69" w x 14.18" l, 5.00 pounds
Features
- 4-Channel full-range amplifier with on-board electronic crossover and variable bass boost
- 12dB variable bass boost circuit is provided to optimize the low frequency performance of your system
- Variable 12dB per octave electronic crossover allows you to optimize system tuning based on speakers and location
- Full-range preamp outputs facilitate use of multiple amplifiers without the need for adapters or signal splitters
- One-year warranty
Amazon.com
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.
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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 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
| Power 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 + N | |
| Signal-to-Noise Ratio: | 85dBA (reference 1 watt into 4 ohms) | |
| Dynamic Power: | 117 watts at 2 ohms | |
| Effective Damping Factor: | 6.315 at 4 ohms | |
| Frequency Response (-3dB): | 10Hz to 100kHz (-3dB) | |
| Maximum Input Signal: | 6V | |
| Maximum Sensitivity: | 100mV | |
| Dimensions (L x W x H): | 14-3/16 x 9 x 2-11/16 inches (360 x 229 x 68 mm) |
About Infinity
Infinity 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 Box
Infinity Reference 475a 4-Channel Full-Range Amplifier (Silver/Black), Mounting Hardware, Fuses, User's ManualInfinity Amplifier Options
Infinity 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 Amplifier | Infinity Reference 1600a Mono Subwoofer Amplifier | Infinity Reference 5350a 5-Channel Amplifier | Infinity Reference 475a 4-Channel Full-Range Amplifier |
Customer Reviews
Most helpful customer reviews
8 of 8 people found the following review helpful.
By Dane Shepherd
I bought this amp to fit under the driver's seat of my 2000 CR-V. I had to cut the carpet and padding out from under the seat to clear the seat adjustment mechanisms, but it fits great and the glowing blue rails look pretty cool at night.
I've got this hooked up to an Alpine head unit via preamp-outs and driving two pair of Infinity 6020 6.5" Component speakers. I cannot describe the difference in sound from the old Infinity shallow-mount coax speakers powered by the head unit. The bass is so deep and powerful with no clipping or bottom-out. The highs are crystal clear and not overpowering. It's hard to tell how much was due to the new amp or the new speakers (since I made both changes at the same time) but I now find myself looking for excuses to drive my car just so I can listen to music. The amp has plenty of features (both low and high pass x-overs and 4x, 3x, and 2x bridging for a variety of sub/sat setups. It is pretty large, but quite attractive, and the sheer amount of clean power is incredible. Highly recommended for loud clean sound; I have not tried this with big subs.
4 of 4 people found the following review helpful.
By pro10is
I've been using this amplifier for over six months now and have had absolutely no problems. I've been unable to raise the volume more than 3/4 because the sound level is simply just too deafening. I can play it at ear piercing levels with no discernible distortion. Hookup was easy and there are plenty of options to customize the signal for your vehicle and head unit. The manual is well written. I carefully selected this amplifier after much research and I have been highly satisfied with the results. It has exceeded my expectations. Do your own research and select the amp that best fits your needs. If you decide to purchase this particular amplifier do so with reasonable confidence that you will receive a quality product.
4 of 4 people found the following review helpful.
By Zach Bell
I have owned this amp now for almost a month and I am very happy with it. it is powering two Kenwood 100watt rms 6x9's in the front doors and two infinity refrence 90watt rms 6.5's in the rear doors. My hu is a Clarion VZ409 and this amp compliments a great system with amazing sound. it has a set of preouts on the amp that allow you to link to another amp for a sub. i have it paired with a JL audio 250/1 slash v2 powering a 12W3V3-4 and i love the sound. the only problem i had was alternator whine which i fixed with a ground loop isolator. this is a great mid range amp with high end sound and features. i love it and reccomend it to all who want qualitry sound.
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