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The Rockford Fosgate T400X4AD Class AD Ultra Compact Full Range Car Amplifier is built for car audio enthusiasts who want serious performance without sacrificing space. This ultra compact design still pushes strong output with 100 watts per channel at 4 ohms or 2 ohms, plus up to 400 watts bridged at 4 ohms when you want more punch. Its advanced Class AD architecture blends efficiency with full range precision, using dynamic frequency switching to keep your sound detailed and clean even at lower volume levels.
This amp is not just about raw output, it is about controlled and intelligent performance. The constant power delivery system adjusts voltage and current in real time based on what your music demands, giving you up to 25 percent more usable output with better dynamic response. Post choke feedback correction constantly compares input and output at the speaker terminals, reducing distortion so your music stays accurate, tight, and true to the source instead of getting muddy or harsh.


Setting up your system is simple thanks to C.L.E.A.N. gain calibration technology, which uses LED indicators to help you match input and output levels without extra tools or guesswork. You also get top mounted controls for front and rear channels, crossover modes, frequency tuning, and Punch EQ so you can shape your sound exactly how you want it. A full adjustable crossover network with high pass, low pass, or full range modes gives you flexibility, while dual fan cooling keeps temperatures stable during long sessions. Add smart protection LEDs, flexible RCA and speaker level inputs with auto turn on, and efficient plug in power connections, and you have a compact amplifier that makes system building easier and sound better every time you drive.
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I just installed this amp and its very small, but packs a lot of power! My birth sheet said 136 rms on the front channels and 142 rms on the rear channels. The box said 100s at 4 and 2 ohm. It has that constant power technology similar to the BDCP amps from Rockford. I have 2 sets of t1 6x8's in my ford five hundred, and I'm pushing them with 50+ watts over what the speakers are rated at (80rms) they sound great with no distortion. The clipping indicator works great! It makes setting your gains properly easy as hell. No engine noise. Clean signal. Tons of power. This amp is worth the price.