Infinity Reference 1600a

Mono subwoofer amplifier
600 watts RMS x 1 at 2 ohms

  • Infinity Reference 1600a


  • Infinity Reference 1600a


  • Infinity Reference 1600a


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Item #: 108R1600A

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Our take on the Infinity Reference 1600a

by Buck Pomerantz

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Infinity's Reference Series amplifiers offer impressive power and extensive controls for fine-tuning your sound — an ideal way to boost your music's intensity and clarity. Strict reliability testing results in durable, dependable amplifiers, and their compact size gives you more installation options in tight places.

The Reference 1600a mono subwoofer amplifier ensures steady power delivery, thanks to its highly efficient, Class D design. This powerful amp will satisfy your inner bass head, delivering up to 600 watts RMS to your subwoofer system. And every Infinity Reference amplifier is certified to deliver power as advertised.

Adjust the amp's variable low-pass filter and bass boost to get more efficient output and cleaner low-end kick from your sub/enclosure combo. Preamp outputs simplify hookup to another amp in your system, so system building is quick and easy. Direct-connect terminals make reliable connections without any crimping or soldering.

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  • mono subwoofer amplifier
  • 400 watts RMS x 1 at 4 ohms (600 watts RMS at 2 ohms)
  • CEA-2006 compliant
  • variable low-pass filter (32-320 Hz, 12 dB/octave)
  • variable bass boost (0-6 dB at 50 Hz)
  • Class-D amplifier design
  • MOSFET power supply
  • preamp-level inputs and outputs
  • fuse rating: 25A x 3
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 14-3/4"W x 2-3/4"H x 9"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
RMS Power Output (Watts x Channels) 400 x 1
Peak Power Output (Watts x Channels) 894 x 1
Power at 2 Ohms (Watts x Channels) 600 x 1
Bridged Power (Watts x Channels) N/A
Minimum Impedance Bridged N/A
Minimum Impedance Unbridged 2
Best Frequency Response 11-330 Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 80 dB
Input Voltage 14.4v
Amplifier Class D
Low-Pass Crossover Frequency 32-320 Hz
Low-Pass Slope (dB/octave) 12 dB
High-Pass Crossover Frequency N/A
High-Pass Slope (dB/octave) N/A
Bass Boost 0-6 dB
Bass Boost Frequency 50 Hz
Fan Cooled No
Fuse Rating 75
Speaker Level Inputs No
Preamp Outputs 1 pair
Width (inches) 14-3/4
Height (inches) 2-3/4
Depth (inches) 9
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • Mono amplifier
  • Three 25A ATO fuses (installed)
  • Instructions
  • Warranty/Product Registration card

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.



CEA-2006 Compliant: CEA-2006 is a new system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for determining an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or less Total Harmonic Distortion (THD) plus noise, and at a frequency range of 20 Hz to 200 Hz, when applicable. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. The Infinity Reference 1600a under CEA-2006 regulations is rated at 400 Watts RMS x 1 channel with a 80dBA signal to noise ratio.

Mono-Power Amp Design: The Infinity Reference 1600a is designed with specific features to power your subwoofers with a frequency range between 11-330 Hz. This amplifier is not designed to power a full-range speaker.

Class D Design: The Infinity Reference 1600a is equipped with a high-performance Class D switching power supply, which is more efficient than traditional class AB power supplies, and draws less current from your vehicle's charging system.

Protection Circuitry: The amp features 4-way protection, and will shut itself down in the following cases:

  • DC Output: DC voltage is detected on the amplifier output
  • Temperature: Amplifier is overheated
  • Over/Under Voltage: Voltage at the +12V (Battery) terminal is less than 8.5V or more than 16V
  • Short Circuit: Short circuit in speaker or speaker wire

Power and Protection LEDs: The amplifier features a Power and Protection LED on top of the unit. The Power LED illuminates Green when the amplifier is supplied power. The Protection LED will illuminate Red when the amplifier goes into protect-mode.


Input Level: Rotary control to match the level of the preamp input signal.

Low Pass Filter: The 1600a has a variable 12dB per octave, 32-320Hz low pass filter to prevent unwanted high-frequencies from reaching your subwoofers so they can play deeper and louder.

Bass Boost: The Bass Boost control allows you to enhance the bass output of your system at 50Hz up to 6dB.


Preamp Output: 1 pair of gold-plated RCA jacks (amp provides a non-filtered signal for daisy-chaining additional amplifiers).

Preamp Input: 1 pair of gold-plated RCA jacks.

Remote Level Control: RJ-11 jack for use with the optional remote sub-level control (sold separately).

IMS Input: This port is designed for future Infinity expansion products.

Speaker Output: 4 Set screw terminals for connecting speaker wires; handles up to 8 gauge (16 gauge minimum recommended).

Note: There are two sets of terminals to make it easier to connect multiple subwoofers. The terminals are connected internally in parallel.


  • +12V: Set screw terminal for power wire from battery; handles up to 4 gauge wire (8 gauge minimum recommended)
  • Remote: Set screw terminal for remote turn-on lead; handles up to 8 gauge wire (18 gauge minimum recommended)
  • Ground: Set screw terminal for ground; handles up to 4 gauge wire (8 gauge minimum recommended)

Fuses: 3 Slots for 25A fuses (installed).

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Infinity Reference 1600a Reviews

Average Customer Review:

11 people say:

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4 out of 5

Infinity Reference 1600a

Written By Customer, Charlotte Hall, MD on Friday, June 06, 2014
Crutchfield Customer Review (What's this?)
Very nice for the price
Was this review helpful?    Yes | No
4 out of 5

Flat out

Written By Mason, Lexington on Friday, April 25, 2014
Lets get this straight. You get what you pay for. This is a middle grade product. It's as simple as 12v in and a ground. Regulate the amperage and voltage and you should have healthy sound. If you don't and you bridge your connections you're prone to quality loss. That's theory and fact.

Personally I had this amp for 6-12 months driving a kappa 10" and a ported box. It was loud and clear until something in my trunk rubbed my sub tearing the gasket. Resealed it and traded up to a closed, caged, and beefy jl 12w6v2. plenty of power for both subs and sounded great.

A lot of people have had heat issues. I never personally had issues, but that doesn't mean you'll never have a bad egg. I build pc's and while my cpu runs 20 degrees cooler than most of the exact build, it doesn't mean anything when it comes to electronics that are mass produced.
Lower quality.
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
4 out of 5

Love it

Written By kenp, Bradenton Florida on Saturday, April 19, 2014
Crutchfield Customer Review (What's this?)
Looks nice sounds nice has cool blue lights nice and easy connections would recommend.
Sleek Powerful Good connections
A little a on the larger side
Was this review helpful?    Yes | No
1 out of 5


Written By Dave, philly on Wednesday, January 23, 2013
Crutchfield Customer Review (What's this?)
this thing is a piece of junk, i always liked infinity products, but this one flipped my opinion. i had it on a 2 ohm load, soon as i turned it up, it would just cut out. this happened in the first hour of operation, one song at first, then all. the unit was also an absolute pain to install and is twice the size of other comperable amps. it was also very difficult to "tune". i am an electrician by trade, my electrical system is very beefy, the voltages and amperages were well within the amps claimed operating perameters and still it would just cut out. sorry infinity, but you got some work to do.
looks really cool.... thats it.
piece of junk
1 out of 2 people found this helpful
Was this review helpful?    Yes | No
"Coolness Factor"
Build Quality
Ease of Use
Sound Quality
1 out of 5


Written By Anonymous, az on Saturday, May 21, 2011
Crutchfield Customer Review (What's this?)
amp kept over heating, cutting off, etc...
3 out of 7 people found this helpful
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5 out of 5

Great Amp for Entry-Mid Level Subwoofers!!

Written By BrendanG, Middleboro, MA on Friday, February 18, 2011
This amplifier I use to power 2 300W JL Audio Subwoofers and let me tell you
this thing is impressive. Just watch out it draws a lot of power! Make sure you
have a capacitor or extra battery nearby if you plan on pushing this thing to peak.

With the internal fans, even after hours of being at or near RMS, this amplifier
does not cut out, get softer or anything.

To hookup, they give you two positive terminals to make a dual subwoofer setup
easy. Just note that behind the connector the two positive and two negatives are
connected. They are not separate channels.

Also the pre-amp outputs make chaining amplifiers together much simpler. I may
buy another, and not having to run more wires keeps me pleased.

For the price this is the amplifier for you!
3 out of 3 people found this helpful
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5 out of 5

Fantastic pushing boost on the subs

Written By Aaron, Butler on Friday, November 05, 2010
When you buy any subs to their max watts in-between the what the amps does equal amount of feedback from the subs handle in the circuit board sending a circuit holds the amps juice back from letting the sub work like it should to prevent the sub from blowing and over heating your amp
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5 out of 5

wicked good amp

Written By Jarvis, new paltz, ny on Thursday, February 04, 2010
i have to say i've had two mtx amps in the past and this amp just blows them away. i have it powering a kappa perfect 12vq sub and it does it easily. you can run it hard for a long time and it stays cool the entire time. the only thing about this amp that actually confused me is that it has outputs for two subs, like two channels, but the book they give you doesnt tell you how much each of them suppplies when both used. just what it can do in a mono hookup. o well, still an amazing amp!
4 out of 5 people found this helpful
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5 out of 5

Awesome Amp

Written By Dion, PA on Thursday, January 28, 2010
Recently bought this amp, and have it hooked up to a single Rockford Fostage Power
Stage 1 10'' sub (600 rms at 2 ohms.) Handles it with zero problem...after continuous
use, it barely gets warm. The blue light looks really cool too.
1 out of 1 people found this helpful
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5 out of 5

Great Amp

Written By Corey, Atlanta, GA on Sunday, May 17, 2009
This is a fantastic Amp. I have it running to two Rockford Fosgate Punch1 12's and it does the trick ! very easy install, and looks really cool when the blue lights up when power is supplied to it.
4 out of 6 people found this helpful
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4 out of 5

Infinity Reference 1600a

Written By Tyrone, Las Vegas NV on Thursday, September 11, 2008
This is the best amp I have ever owned. I am planning to buy at least two more infinity amps.
31 out of 41 people found this helpful
Was this review helpful?    Yes | No

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