Kicker 47KEY2004 Car Audio Smart DSP 4 Channel Speaker Amplifier 40 Band EQ Amp

Replaced my stock Tacoma paper speakers with a set of Kicker components, and that sounded great. Added this amp though, and it made it sound INCREDIBLE! The Key calibration system is a really really nice feature, totally gets the sound tuned for the new speakers and the cabin. Great value.

This week I had the opportunity to install the Kicker Key 200.4 in my Corolla Cross 2025 and I was surprised with the result. Much better than I imagined and an excellent cost benefit. The original speakers were also replaced by Hertz from the Cento line.The auto tuning function does an excellent job correcting the frequency response and timing.

What an exceptional little amp. The sound quality is phenomenal, the clarity is fantastic! I combined this with Kicker KS series 6x9 components up front and 6.5 coaxial speakers in the rear of my 2019 F150 XLT. I wish I had done this years ago. Only small crux is I ended up needing to run a remote turn on wire as the auto turn on wasn't functioning properly in my truck. One wire and a lot of rerunning wire and it started up with zero issues.I really hope that Kicker expands the Key technology further in the future. It's now a proven concept that can match the performance of most DSP setups but adds the value of being DIY friendly for those of us who prefer to install our own equipment or cannot afford a full DSP setup and the associated installation and tuning costs and or headaches. I'd love to see Kicker offer a higher watt version of this amp. If and when they do, I'll be seriously considering an upgrade. Not to say that this isn't powerful though, I honestly can't crank it all the way up because it's too loud. I love being able to say that!Also it makes all kinds of music better. It truly doesn't matter what you listen to, you will hear instrumentation and vocals that you have never noticed before while listening to your all time favorite songs.

Installed this on my car, sound quality has improved a ton, sound has more depth to it and it is way more clear now. This unit is compact and doesn’t require a ton of power, install and setup was pretty straightforward. Only downside is it does have a noise floor, since the amp is so small, internal components cause a little bit of noise, barely perceptible but if you have sensitive hearing it can be annoying until you play some music or sound. If your car is running you probably won’t notice it.

Wired the key amp directly to my anc wires, used a anc ch01 harness and is plug and play in my 21 Ram DT with base audio. You cut harness, connect high level to amp wires and connect other side to speakers, the anc ch01 is labeled correctly for the Ram, so makes it easy. Then cut the white connector with yellow and black wire, the anc amp in the Ram has 25 amp fuse, this key amp is 20amp. Black wire is ground. I wired it all up in house, went out and plugged in(takes 30 seconds to plug into old connectors that went in and out from the anc amp. So now sound, turn off auto EQ, is boosts the lows and highs and makes highs too bright. I feel like 50 watts per channel should get louder, I listen to it at over 80% of my total volume. Bass tracks sound fantastic, but rock tends to be lower volume. I am going to reset it and try a few more times, seems like the clipping light comes on too soon. Might be due to I have jbl 2.3 ohm 6x9s in back and kenwood 6x9+3.5 component set in parellel up front. It is worthwhile to do in the Ram. I found my windshield reflects a odd sound, so I added a circle sticker under 3.5 cover to stop the windshield relection.

I installed this amazing device on my 2018 Subaru Crosstrek. I wanted to upgrade the factory sound experience but leave the OEM unit installed. I upgraded the factory speakers to Kicker CS (3.5 on the dash, 6x9 in the front and 6.5 in the back). The sound was so bad an it was a huge disappointment. I then realized that I installed some great speakers, but my OEM unit just couldn't drive it. As it's designed to drive the (really bad) factory speakers it limits most of the frequencies and the result was awful. I read so many great reviews for this product and watched some very detailed videos, but I was VERY skeptical about the Kicker Key. How much of a difference does a cellphone sized amp could do, right?I decided to go for it and after a 2-3 hours installation, I ran the automatic setup in BI-Amp mode and BOOM! What a difference! I could not believe it!All the tones were there, the sound stage was amazing, great highs, lows and clear vocals. Everything just sounded 10 times better.Only when you start to toggling the before/after switch on the microphone wire, you understand how poorly it sounded before.. Just amazing.Go for it!

Used this in a 66 mustang complete build. Made custom pods for the kicks with tweets six inches above. I have a very nice set of 5.25" CT Sounds components that sounded like a dumpster fire smothered in hot fecal matter. I knew that they needed more power than they are getting from the deck so I went looking for a two channel amp to liven them up. Ended up buying this four channel Kicker after reading lots of reviews. I received the amp on time as expected. It was MUCH smaller than it seemed in pictures. Did the install fitting it all inside the glovebox of the mustang and guess what. Still sounded like garbage only louder. Next step was to hook up the microphone and set up the DSP equalizer, time delay and crossover network. I installed the mic on the headrest and ran the pink noise track. Five min later after some wizardry this thing sounds awesome. Flattened out the mids and tweets blending great with the sub after I plugged it back in after the calibration. I could not be happier with the install and the sound. If you make this purchase please take the time to use the DSP. It makes a world of difference.