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Rockford Fosgate Power T400X4ad

4-channel car amplifier — 100 watts RMS x 4

Save 50% on a select amp wiring kit with any $249+ car amplifier with any $249+ car amplifier
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  • Rockford Fosgate Power T400X4ad

    Front

  • Rockford Fosgate Power T400X4ad

    Control panel

  • Rockford Fosgate Power T400X4ad

  • Rockford Fosgate Power T400X4ad

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Our take on the Rockford Fosgate Power T400X4ad

by Buck Pomerantz
Rockford Fosgate

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.

Super-compact, bursting with power

Rockford Fosgate's Power Series T400X4ad 4-channel amplifier can send up to 100 watts RMS to four separate speakers, or you could use this tiny powerpack to run a couple of subs with 200 watts each. A dual-fan forced air cooling system keeps this sturdy little amp from overheating, so it can play hard for a long time.

Class AD: accurate and powerful

Rockford Fosgate uses their proprietary Class AD amplifier technology, combining the high fidelity of a Class A system with the high efficiency of their special Class D technology, to bring you this ultra-efficient, high-output amplifier. In other words, this compact amp produces more power with less current draw from your vehicle's charging system than most other amps on the road today.

Rockford Fosgate's high-tech solutions yield more power

Power Series amplifiers actively monitor speaker performance using Rockford Fosgate's Constant Power technology. A speaker's impedance naturally fluctuates as it performs, fighting against your amp's output. So, just like your cruise control increases the engine's RPM to maintain your car's speed uphill, Constant Power maintains this amp's output by increasing its internal voltage and current flow when the speaker's impedance rises. This results in up to a 25% increase in the amp's total power output.

Rockford Fosgate T400X4ab

T400X4ab control panel with clip lights

Easy to set for optimum performance

Rockford Fosgate's C.L.E.A.N. technology (Calibrated Level Eliminates Audible Noise) setup system ensures your music will sound as clean and powerful as possible. It works like this: play the setup tone on the included test CD, adjust the receiver volume until a red clip light on the amp goes out, then turn the amp gain up until a blue light comes on. It's that simple — your amplifier will be perfectly set to match your receiver's output. When your receiver reaches maximum clean volume, you'll get maximum clean power from your Power amp. At quiet listening levels, you'll hear less background noise and more of your music.

Clip lights

If that blue light turns solid red while you're playing music, the amp's telling you that your source is distorting and you should turn it down, or risk damage to your gear. The optional PLC2 remote level control also doubles as a clip indicator, so you can see from the front seat if your music's clipping.

Rockford Fosgate T400X4ad

T400X4ad input connections (harnesses included)

Highlights:

  • 4-channel car amplifier
  • 100 watts RMS x 4 at 2 to 4 ohms
  • 200 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
Features:
  • Class AD amplifier design
  • Constant Power technology maintains full output power despite impedance changes
  • C.L.E.A.N. gain setup system includes clip lights and test tone CD
  • differential input circuitry helps eliminate hum
  • dual-fan forced induction cooling
  • variable high- and low-pass filters (50-250 Hz, 12 dB/octave)
  • variable Punch EQ (bass/treble boost: 0-18 dB at 45 Hz, 0-14 dB at 12,500 Hz)
  • optional PLC2 Punch Level Control wired remote with clip light available
More Info:
  • preamp and speaker-level inputs (quick-connect input harnesses included)
  • signal-sensing turn-on with speaker-level inputs eliminates need for remote turn-on lead
  • 8-gauge power and ground leads and a 60-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 8-5/16"W x 1-15/8"H x 4-1/4"D
  • warranty: 2 years (extends to 3 years when purchased with a Rockford Fosgate RFK8, RFK8i, or RFK4D amp wiring kit)
  • Our 60-day money-back guarantee
Preliminary info from the manufacturer
Features and Specs
Performance
RMS Power Output (Watts x Channels)
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100 x 4
Peak Power Output (Watts x Channels)
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---
Power at 2 Ohms (Watts x Channels)
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100 x 4
Bridged Power (Watts x Channels)
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200 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-20000 Hz
THD at Rated RMS Power
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---
Signal to Noise Ratio
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---
Input Voltage
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---
Features
Amplifier Class
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A/D
Low-Pass Crossover Frequency
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50-250 Hz
Low-Pass Slope (dB/octave)
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12 dB/octave
High-Pass Crossover Frequency
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50-250 Hz
High-Pass Slope (dB/octave)
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12 dB/octave
Bass Boost
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0-18 dB
Bass Boost Frequency
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45 Hz
Fan Cooled
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Yes
Fuse Rating
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60
Speaker Level Inputs
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Yes
Preamp Outputs
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---
Width (inches)
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8-5/16
Height (inches)
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1-5/8
Depth (inches)
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4-1/4
Parts Warranty
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2 Year
Labor Warranty
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2 Year
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1 question already asked

has anyone put this amp on a Harley Street Glide. How well do you like it and what kind of speakers do you have? [ Glenn  May 31, 2014 ]
1 answer
  • I put this amp in a 2014 street glide special. The amp is great and very easy to setup. I am running Hybrid Audio Texhnologies 6.5's in the faring and Hybrid Audio Texhnologies 5x4's in the bad lids. Sound us loud and super clear. I had to do a little water proofing of the amp though due to the new vent being directly over the amp. [ Robert   Jun 01, 2014 ]

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