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Kicker 47KEY2004 Key 4-Channel DSP Smart Amplifier, 4x50W

4.6 4.6 out of 5 stars 128 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Car Multichannel Amplifiers by KICKER

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Purchase options and add-ons

Item dimensions L x W x H 12 x 10 x 3 inches
Voltage 12 Volts
Manufacturer Kicker
Mounting Type Surface Mount
Brand KICKER

About this item

  • Don’t just make your system louder - make it clearer. Make it better.
  • Press the selector, and the microphone goes to work. The KEY uses a powerful internal computer to deliver dramatic improvements in realism and soundstage.
  • A massive 40-band equalizer improves tonality, and a 24dB crossover re-defines the capabilities of each speaker.
  • The concert quality of your factory stereo is revealed! What would take hours for a professional to achieve happens in a matter of minutes.
See more product details

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Kicker 47KEY2004 Key 4-Channel DSP Smart Amplifier, 4x50W

Kicker 47KEY2004 Key 4-Channel DSP Smart Amplifier, 4x50W


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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 12 x 10 x 3 inches; 2.23 Pounds
  • Item model number ‏ : ‎ KEY2004 (47KEY200.4)
  • Date First Available ‏ : ‎ February 5, 2020
  • Manufacturer ‏ : ‎ Kicker
  • ASIN ‏ : ‎ B084HLVFFK
  • Customer Reviews:
    4.6 4.6 out of 5 stars 128 ratings

Product Description

Kicker 47KEY2004 KEY 4-Channel DSP Smart Amplifier, 4x50W The biggest advance - in the smallest package. Introducing the KEY smart amplifier and audio processor in one, featuring AI-driven DSP. Press the selector, and the microphone goes to work. The KEY uses a powerful internal computer to deliver dramatic improvements in realism and soundstage. A massive 40-band equalizer improves tonality, and a 24dB crossover re-defines the capabilities of each speaker. The concert quality of your factory stereo is revealed! What would take hours for a professional to achieve happens in a matter of minutes. All automatically. All with the press of a single button. POWERHOUSE - In addition to an unbelievable sound quality, the KEY200.4 delivers 200 watts of pumpin’ power to your factory speakers. At KICKER, we know power and clarity always go hand-in-hand. HIDDEN TREASURE - Measuring less than eight inches long and only two inches high, the KEY200.4 fits nearly anywhere. Mount it behind your radio, under the seat, or in your trunk with ease. START. DON’T STOP. - The KEY200.4 is one of the first amps fully compatible with newer vehicles using start-stop systems. Features - 200 Watts Of Power (50x4) Auto EQ Microphone With Selector Switch Included Compatible with Start/Stop Vehicle Technology FIT2 Technology Included Turn On Via Remote 12v Signal Or DC Offset Auto 40-Band Equalizer Bi-Amp Capability (Defeatable) Auto Compressor (Defeatable) Kicker EQ Preset (Defeatable) Auto Time Alignment (Defeatable) Auto Level Adjustment (Bi-Amp Mode Only) Auto Speaker Size Detection 24dB Crossovers 60/80/120hz High Pass Filter (Defeatable)

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Kicker 47KEY2004 Key 4-Channel DSP Smart Amplifier, 4x50W
Kicker 47KEY2004 Key 4-Channel DSP Smart Amplifier, 4x50W
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Price-7% $280.00
Typical:$299.99
$649.99-8% $229.99
List:$249.99
$219.99$439.95
Delivery
Get it as soon as Tuesday, May 21
Get it as soon as Tuesday, May 21
Get it as soon as Friday, May 17
Get it as soon as Tuesday, May 21
Customer Ratings
Sound quality
4.8
4.6
4.4
Value for money
4.7
4.4
4.4
Sold By
Photo-Zone [Authorized Dealer]
CIK Asset Recovery
WoofersEtc
Photo-Zone [Authorized Dealer]
Pacific Stereo
Drive In Car Audio
number of channels
4
5
6
4
4
8
voltage
12 volts
40 volts
12 volts
12 volts
mounting type
Surface Mount
Surface Mount
Surface Mount
Surface Mount
Surface Mount

Looking for specific info?

Customer reviews

4.6 out of 5 stars
4.6 out of 5
128 global ratings

Customers say

Customers like the sound quality, compactness, appearance and ease of installation of the electronic component amplifier. For example, they mention it makes all kinds of music better, it fits nicely behind the stock head unit and that it provides enough power to breathe life into after market speakers. That said, they also like the value.

AI-generated from the text of customer reviews

22 customers mention16 positive6 negative

Customers like the sound quality of the electronic component amplifier. They say it has a very good sound, with upgraded bass. They also appreciate the great highs, lows, and clear vocals. They mention that it makes all kinds of music better, with no weird noises or distortion. They love the key feature that auto tunes using the provided mic.

"...Now that it’s in and tuned, it sounds great! It’s barely bigger than my iPhone, so it’s easy to hide inside the dash." Read more

"love the key feature where it auto tune using the provided mic nice sound I pair it with same brand speakers components on front coax on back KS..." Read more

"...It is as nice clean enriched sound. Adjusts the settings on its own to set the speakers to the cabin of the car just right in my opinion...." Read more

"Exactly the size of the box for a new IPhone ProMax. Excelent sound quality, I’m driving 4 Focal 60 rms speakers and makes then sound without any..." Read more

5 customers mention5 positive0 negative

Customers are satisfied with the compactness of the electronic component amplifier. They mention that it has excellent sound quality in a unbelievably compact size. Some say that it fits nicely behind the stock head unit in the dashboard.

"...Now that it’s in and tuned, it sounds great! It’s barely bigger than my iPhone, so it’s easy to hide inside the dash." Read more

"...The size is so practical, you can hide almost anywhere. I didn’t use the integrated DSP, I don’t think it’s required in my application...." Read more

"...for this amp, and it installed quickly and easily, fitting nicely behind the stock head unit in the dashboard...." Read more

"The Key works great! Love the size and the setup! If I could change one thing it would be 300watts." Read more

4 customers mention4 positive0 negative

Customers are impressed with the appearance of the electronic component amplifier. They mention that it is very nice, compact, and has good highs and lows.

"...gets just a tad hot/warm but doesnt seem to affect the operation. prett good highs,lows, frequency adjustments for user,motorcycle friendly for..." Read more

"Pure gold!..." Read more

"Very nice and compact..." Read more

"Very impressive..." Read more

4 customers mention4 positive0 negative

Customers find the installation of the electronic component amplifier easy. They mention that it's relatively inexpensive and a huge improvement in sound. However, some customers report that the wiring is difficult.

"...Wiring was straightforward, but I couldn’t get it to auto tune right away...." Read more

"...Wiring was really easy although I didn’t get a wiring diagram in my box...." Read more

"...on how to build a plug-n-play harness for this amp, and it installed quickly and easily, fitting nicely behind the stock head unit in the dashboard...." Read more

"Very easy to integrate and set up in my Bronco. I was skeptical that the microphone and auto-setup feature would do anything noticeable...." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the power of the electronic component amplifier. They mention that it provides enough power to breathe life into after market speakers, and that the clarity is amazing.

"What an exceptional little amp. The sound quality is phenomenal, the clarity is fantastic!..." Read more

"Was lucky enough to snatch one up. It provides enough power to breathe life into your after market speakers. It is as nice clean enriched sound...." Read more

"Got this installed this past weekend and power and clarity are amazing… but the professional install and calibrated Auto EQ is wayyyyyy too bright…..." Read more

"Love the size Good power for my Infinity's6*9 and 4*6 speakers." Read more

4 customers mention4 positive0 negative

Customers appreciate the value of the electronic component amplifier. They say it's well worth the outcome, a good product for the price, and pure magic.

"...Install is a little tedious with wiring but well worth the outcome." Read more

"...And I have a lot of experience with sound systems. Very good product for the price. Looking at buying another one for my jeep too...." Read more

"so far pretty darn good. gets just a tad hot/warm but doesnt seem to affect the operation...." Read more

"I was skeptical, but this is PURE MAGIC..." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the clarity of the electronic component amplifier. They mention that the quality is phenomenal, and the signal is very clear.

"...The sound quality is phenomenal, the clarity is fantastic!..." Read more

"...used it for my factory stereo, using a 4 channel LOC and I got a very clear signal, no weird noises or distortion at all...." Read more

"...Subtracting two stars as the Auto-EQ while loud and provides clarity… is that painful 😔..." Read more

Most definitely does the job for my motorcycle!!!!
5 Stars
Most definitely does the job for my motorcycle!!!!
so far pretty darn good. gets just a tad hot/warm but doesnt seem to affect the operation. prett good highs,lows, frequency adjustments for user,motorcycle friendly for sensitive electronics!
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Top reviews from the United States

Reviewed in the United States on March 20, 2023
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.
6 people found this helpful
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Reviewed in the United States on September 11, 2023
I replaced the faculty speakers In my ram 2500 without Kicker CS and powered them with this amp. Wiring was straightforward, but I couldn’t get it to auto tune right away. The instructions say to turn to the volume to a little louder than conversation. After 3-4 failed attempts, I turned up the volume. I could clearly hear it from outside the truck, but it took right away. Now that it’s in and tuned, it sounds great! It’s barely bigger than my iPhone, so it’s easy to hide inside the dash.
One person found this helpful
Report
Reviewed in the United States on September 3, 2021
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!
17 people found this helpful
Report
Reviewed in the United States on January 15, 2024
The install is lengthy, but not too much more than the typical car audio amp. The magic is in the automatic programming you run once installed. (You will need a USB thumb drive to do that.)

If you are adding this amp to a newer vehicle and have no sound from your speakers when finished, you might assume you have a bad amp. Try pressing the little button on the amp that is supposed to trick the radio into thinking that all speakers are connected. If STILL no sound (that little button on the amp is ineffective on many newer vehicles) you'll need to buy and install another $60 special box of resistors called a KISLOAD4 (also from Kicker) that tricks the factory radio into thinking the speakers are plugged in.

For example, my vehicle is a 2020 Jeep Wrangler with factory Base audio system, and I needed the extra KISLOAD4 box to make it all work.

Kicker audio has great (and patient) technical support if you need it during install.
One person found this helpful
Report
Reviewed in the United States on December 4, 2023
love the key feature where it auto tune using the provided mic nice sound I pair it with same brand speakers components on front coax on back KS series I recommend I already had a sub kicker also now my sound is nice and crisp nice loud audio
One person found this helpful
Report
Reviewed in the United States on May 2, 2021
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.
7 people found this helpful
Report
Reviewed in the United States on May 13, 2023
Was lucky enough to snatch one up. It provides enough power to breathe life into your after market speakers. It is as nice clean enriched sound. Adjusts the settings on its own to set the speakers to the cabin of the car just right in my opinion. Takes a lot of guess work out of the set up for you. Install is a little tedious with wiring but well worth the outcome.
One person found this helpful
Report
Reviewed in the United States on February 6, 2023
Exactly the size of the box for a new IPhone ProMax. Excelent sound quality, I’m driving 4 Focal 60 rms speakers and makes then sound without any kind of distortion at low or high volume.

The size is so practical, you can hide almost anywhere. I didn’t use the integrated DSP, I don’t think it’s required in my application.

I used it for my factory stereo, using a 4 channel LOC and I got a very clear signal, no weird noises or distortion at all.

Would buy it again without hesitation!
3 people found this helpful
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Top reviews from other countries

Translate all reviews to English
greñas
5.0 out of 5 stars Muy buen amplificador
Reviewed in Mexico on February 23, 2022
Sí cambia bastante el sonido, un poco “alto” en los agudos para mi gusto, pero suena mucho mejor que el estéreo original sin él. Bajando los test tones es bien fácil de configurar
Jason Guild
1.0 out of 5 stars Incomplete
Reviewed in Canada on May 10, 2021
Missing parts
One person found this helpful
Report
Clarky
5.0 out of 5 stars The sound quality improvement is great!
Reviewed in Germany on November 11, 2022
When it arrived it was smaller than I expected which made installing it behind the dash on the passenger side possible (2021 Corolla)

I installed this after installing some Focal speakers and the improvement in the sound is great after the auto calibration!
Old 50’s / 60’s stereo enthusiast
4.0 out of 5 stars Great enhancement for poor stock speakers
Reviewed in Australia on July 11, 2022
I used this product to augment an old Mercedes’ 1970’s Becker stereo. I like my old stock head unit because it’s stylish, matches the old classic car and was quality back in its day. Today though… it’s poor sound quality. Ancient paper cone speakers, 4inch in front, 5inch in rear. I inserted the kicker key 200.4 into the system to work it’s electronic magic trickery. Once installed, I used the self-tuning system with the supplied microphone.

The results are staggering. Somehow my ancient tiny speakers have acceptably good clarity and even acceptable levels of bass. They are all matched in volume, and the sound stage sounds like it’s right between my ears when sat in drivers seat.

Superb product for lifting an worn out old stock system into the present day.

Impressed with kicker yet again. Have ordered a set of their entry level speakers now as a follow up from these excellent results.

Just a word of warning though… in old cars with earthed negative returns on the speakers, you will need to wire both negative and positive from/to the speakers and cannot earth the speaker inputs to ground. Because It’s a class D amp. (Same with any class D amps, not just kicker). Enjoy.

There is also just a whisper of white noise from the amp when powered up, but no music playing. This needs to be improved for future models Kicker!