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Kicker 47KEYLOC Smart Line-Out Converter 2-channel line output converter with automatic tuning DSP

Item # 20647KEYLO

Kicker's KEYLOC detects the frequency range of the factory wiring, and will also correct factory EQ response

Kicker's KEYLOC detects the frequency range of the factory wiring, and will also correct factory EQ response

15 questions - 25 answers

Item # 20647KEYLO

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About the Kicker 47KEYLOC Smart Line-Out Converter

Buck Pomerantz

Aftermarket integration done right

We're encountering more and more instances where the factory stereo system in a vehicle can't be replaced or bypassed, so any aftermarket amps and processors have to use the speaker wiring in order to get signal. We've also found that not all wires carry a full-range signal — high frequencies go to tweeters, midrange sounds may go to door speakers, and low frequencies go to a factory subwoofer — making it pretty complicated to access a full-range signal for your aftermarket system.

Aftermarket integration done right

We're encountering more and more instances where the factory stereo system in a vehicle can't be replaced or bypassed, so any aftermarket amps and processors have to use the speaker wiring in order to get signal. We've also found that not all wires carry a full-range signal — high frequencies go to tweeters, midrange sounds may go to door speakers, and low frequencies go to a factory subwoofer — making it pretty complicated to access a full-range signal for your aftermarket system.

KEYLOC to the rescue

Kicker's KEYLOC Smart Line-Out Converter solves these issues by, first, automatically detecting the frequency range of the speaker wiring you want to use for your system's input, so you'll know if you're tapping into a full-range signal or not. Then, you engage the KEYLOC's factory EQ correction feature to produce a flat response for your aftermarket system to handle. After installation, you download test tones and tracks, free from Kicker, to use for signal identification and restoration. The device's KEY button gets you into the automatic programming and set-up modes, where you use four different Kicker files to analyze the factory signal and then restore full-range sound, while blinking LEDs indicate what's happening.

Manual override

Some factory systems have one speaker, usually the front passenger side, purposely wired out of phase to give a 3-D effect to the sound. You can program your KEYLOC to correct for that. You can also program the KEYLOC to pass low frequencies only, when you're only adding a subwoofer to your system.

It'll fit in anywhere

This unit is so small it'll fit in most dashes. Kicker's FIT2™ technology — with speaker-level inputs that can take up to 400 watts RMS — ensures this line output converter will work in almost any system. A Radio-Detect function makes sure you never get a "No Speakers Detected" message on your receiver's display when you install this processor. Output gain controls let you adjust your KEYLOC's output to match your amplifier's input sensitivity.


Product highlights:

  • 2-channel active line output converter
  • automatic frequency response detection (RTA)
  • automatic factory EQ correction (DE-EQ)
    • download test tones and tracks from
    • manual programming includes an all-pass option to remove factory phase issues
  • 2 speaker-level inputs with up to 400 watts RMS power handling
  • 2 preamp-level outputs (up to 10V)
  • output gain controls
  • 12-volt turn-on lead output
  • fuse rating: 2A x 1
  • dimensions: 5-3/4"W x 1-7/16"H x 2-7/8"D
  • warranty: 2 years
  • MFR # 47KEYLOC

What's in the box:

  • DSP-Controlled line-output converter (2 ch.)
  • 10" 8-Pin harness
  • Four 10mm screws
  • Quickstart guide
  • Kicker Tech Support information

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More details on the Kicker 47KEYLOC Smart Line-Out Converter

Stacey B.

Product Research


Overview: The Kicker KEYLOC is a 2-channel line-out converter with DSP processing that can detect, analyze, and correct the audio from you factory system, when adding aftermarket amplifiers. The KEYLOC's patent-pending KEY algorithm automatically detects and analyzes crossovers, EQ, time delay, and any all-pass filters present. It will then correct these various audio treatments, for the smoothest frequency response possible, and level-matches the left and right audio channels, giving you a clean, uncolored audio signal for your aftermarket amplifiers.

DSP Features: The KEYLOC's 2-channel DSP processing includes the following features:

  • Automatic Turn-On: The KEYLOC senses DC offset on the speaker-level inputs, between 2.5V and 6V, to automatically power on. A Remote In wire can be used if the connected headunit features a turn-on output. The KEYLOC features a corresponding Remote Output wire that can provide a +12V output signal to power on other equipment.
  • Frequency Response Correction: Smoothes the frequency response on the 2 input channels via EQ correction, with Q's ranging from 0.5 - 10 with up to ±12dB of boost or cut.
  • Factory Time Delay Defeat: Ranges from .06mS - 10mS, with .06mS accuracy.
  • All-Pass Filter Defeat: The KEYLOC can correct up to 3 all-pass filters on one channel. The all-pass filters can even have a Q ranging from 0.5-3.5, as long as they're not interacting with other all-pass filters.
  • Passive Frequency Detection: The KEYLOC's default status is in Passive Frequency Detection mode which can detect what band of frequencies are available on each of the speaker input channels.

Signal Identification & Restoration: The KEYLOC setup process includes playing various test tones through the system for analysis and correction. Test tones for the converter are not included and can be found here. Three top-panel LEDs, Low, Mid, and High, can show what frequencies have been detected for each channel, using the downloaded Pink Noise track:

  • Low: 20Hz - 200Hz
  • Mid: 200Hz - 2kHz
  • High: 2kHz - 20kHz


    • Pink noise test tones are NOT included and can be downloaded here.
    • Factory noise-canceling and active noise enhancement must be disabled before running the Auto-Setup.

Signal analysis and restoration are completed using the downloaded GainMatchSweep, Noisefloor, and FullTest test tracks. These are custom audio files that, when played from your headunit, will allow the KEYLOC to determine what frequency, coloration, and staging corrections to make. When completed, the KEY button will let you toggle between the original sound and the corrected sound, for a quick A/B comparison. It's also used for navigating through the setup, menus, and for resetting the module back to default. When the automatic setup is complete, the following Menu options are provided via the top-panel LEDs:

  • LED 1: All-pass or Time-Delay defeat On/Off.
    • Solid: Time-Delay correction is active.
    • Blinking: Time-Delay & All-Pass are defeated.
  • LED 2: Indicates if Left/Right channel gain matching is On (solid) or Off (blinking).
  • LED 3: Reset (hold KEY button for 10 seconds).
  • LED 4: Exits the Menu (hold KEY button for 1 second). 

Additional Controls, Indicators and Wiring:

  • Input Sensitivity (Hi/Lo): This 2-way push-button lets you select the input signal range. If the signal is coming from a factory headunit, the Lo setting should be used. If connecting to the output of a factory amplifier, the Hi range should be used.
    • Lo: Accepts signals ranging from 125mV - 10V. This setting incorporates a 60Ω load on the input, allowing it to be used with factory radios that would normally stop outputting sound when no speaker is detected on the wire.
    • Hi: Accepts signals ranging from 1V - 40V.
  • Input Gain: Used to fine-tune the input signal level once the Input Sensitivity range has been selected.
  • Output Gain: Adjusts the converted signal level passing from the RCA output jacks.
  • Power LED: Lights when the processor is powered on.
  • EQ LED: Indicates when the processor is passing a corrected signal to the output (LED on), or when the correction is defeated (LED off). This can be toggled on/off with the KEY button.

Wiring: An 8-pin Molex connector includes the following wires:

  • Yellow: Connects to a +12V constant power source. This line should be protected with a 2A fuse (not included).
  • Red: Remote turn-on input.
  • Blue/White: Remote turn-on output.
  • Black: Chassis ground.
  • White: Left front speaker input (+).
  • White/Black: Left front speaker input (-).
  • Gray: Right front speaker input (+).
  • Gray/Black: Right front speaker input (-).

Outputs: Two female RCA jacks provide the audio output, with up to 10Vrms of signal strength.

Mounting: The Kicker KEYLOC module can be mounted using the 4 screw-hole tabs and the provided hardware, or using standard wire-ties (not included). Its compact size allows it to be mounted in most dashes or tight compartment spaces.

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Customer Q&A

15 questions already asked

Can I use this LOC to power a 4 channel amp and monoblock on my honda civic factory radio?
ethan  Feb 06, 2024
1 answer
This Kicker 47KEYLOC is a 2-channel line output converter, Ethan. While this can be used with RCA splitters to feed a 4-channel amp and subwoofer amp, it is not an ideal solution. Consider using the AudioControl LC5iPRO in the link below that provides 5-channels to feed your dual-amp system and also provides bass restoration features for the subwoofer!
bo  Feb 06, 2024 (Staff)
So I have a kicker key amp running to my upgraded kicker speakers in my bronco I spliced wires for kicker line converter from back speaker speakers to my amp for rear door sub stinger box lots of distortion in sub when I have my gain switch off on my amp for rear sub and turn of gain on kicker key in my dash the subs start to play bass would a kicker 47key loc a line converter fix this problem?
ryan  Apr 04, 2023
1 answer
A line output converter isn't necessary to use with the Kicker Key amps. We would recommend trying the high level (also called speaker level) inputs on your amp instead. If this is something you purchased from Crutchfield and need tech support, you can find our tech support number on your invoice or by logging into your account and accessing the "Orders" tab.
allison  Apr 04, 2023 (Staff)
Does the Keyloc present a load to the factory amp? I know some factor amps stop sending an audio signal if they aren't presented with a load.
shon  Feb 01, 2023
1 answer
This does feature the ability to present a 60-ohm load to a factory radio/amplifier in order to avoid this issue.
zachary  Feb 02, 2023 (Staff)
My car has a factory Amp ran at 2 ohms. Where is the best place to tap the wires and if I tap them before the Amp will it hurt any factory equipment? It's a 2013 Mazda 3 with 12 speaker Bose system... I'm hooking up a mono Amp and sub...
ribert  Dec 31, 2022
1 answer
It will not hurt any factory settings to tap in before the amp. If for any reason the audio is lower in volume you may have to turn up the gain adjustment. Also, if you purchased this from Crutchfield we do offer lifetime tech support on any product you purchase from us!
allison  Dec 31, 2022 (Staff)
Anything else needed to hook this up to a stock santa cruz stereo and KICKER 46HS10?
joshua andrew  Oct 21, 2022
1 answer
We will need more information about your Santa Cruz in order to answer this question. Please reach out to our advisors via chat or phone at 1-800-324-9695. We'll be happy to help!
zachary  Oct 21, 2022 (Staff)
Anything else needed to hook this up to a stock santa cruz stereo and KICKER 46HS10?
joshua andrew  Oct 21, 2022
1 answer
Great question! There are a few other things you would need to connect that converter to your powered subwoofer. I built a cart with the items and linked below. The RCA cable length you need may be different so you can adjust that to whatever you need and please feel free to give us a call at 800.324.9695 to speak with an advisor if you have any questions about the items!
arielle  Oct 21, 2022 (Staff)
How do you turn down the bass? The LCI pro comes with a dial to turn it up and down? Does it work good to turn down the bass in the audio settings of the factory head unit?
charlie  Jun 10, 2022
1 answer
Greetings Charlie, and thank you for the question. The Kicker Key LOC only has a gain setting, so you would not be able to adjust the bass volume unless you go back to that and make your adjustments. not real convenient. You can control the volume via an aftermarket stereo, or the amplifier you purchase either has a wired volume knob, or you can purchase one if not included.
hogan  Jun 11, 2022 (Staff)
Hi wanted to run this from factory stereo to a morel mps 5.950 in bridged mode, would I be able to use one of these to supply the amp all frequencies or need one for mids/hi and another for lows/subs making it 2 keylocs in total?
s  Apr 13, 2022
1 answer
I'm not sure. I think it would work if you ran it to a splitter set of rca. It de equalizes factory eq setting that are built into most car stereos these days. So it gives a full range signal. I would ask the advisors at crutchfield to be sure though.
timothy  Apr 14, 2022
I want to install a 4 channel amp to power my front and rear aftermarket speakers and I can't replace my factory head unit. With this being a 2 channel output converter would it work or would I need 2 of them?
adam  Apr 23, 2021
2 answers
personally if I was doing it in my car I'd definitely would buy two of them seeing if they're highs and mids, y would sound crazy good! It would definitely sound way better than any other regular LoC. But just remember you have to tie into four different lines off your factory speakers / head unit, when buying two of them
shaun  Apr 28, 2021
Other then a fader or eq with a fader, give you more RCAs, not sure any other way, or a least if want to adjust between front and back speakers, if amp can run all 4 channels on two RCA inputs, splitter just EQ not to bad unless going for one like audio control 3-1 or something uses a parametric eq.
tretha  Apr 23, 2021
Can I install this in the truck by my amp? I have a Kia optima with no room up front.. just receive this unit today so I might have to call and get help installing it but that was my first question, plus we can install it by the amp going to make it a lot easier wiring wise for my situation
shaun  Apr 01, 2021
6 answers
Sure mine is actually mounted next to my amp on the back of my rear seat in my Elantra hatchback.
israel  Apr 02, 2021
Yes I installed under my wife's seat. That's where the amp is installed. I jumped power, ground and signal off the amp. It should work fine for you.
timothy  Apr 02, 2021
I have mine installed next to my amp in the trunk of my cts coupe
philip  Apr 01, 2021
You can install this anywhere in the vehicle, you just have to connect your vehicles speaker outputs into the unit..
charles  Apr 01, 2021
Yes you can install by the amp
raleigh  Apr 01, 2021
I have a 2019 journey and installed right next to the amp. It does make it easier for wiring power, negative and remote ( ran them off my amp ). Speaker wires had to be extended out but was able to get a very short rca cable.
chris  Apr 01, 2021
If I do not have a factory stereo do I need this output converter?
izea  Feb 16, 2021
3 answers
No, an aftermarket stereo with rca outputs should already have a flat signal so shouldn't be necessary.
timothy  Feb 17, 2021
No. If you current stereo has RCA outputs, you do not need this.
dustin  Feb 17, 2021
Unless you have output rca
ricky  Feb 17, 2021
I am planning to get a DSP amplifer. Hence do I still need this Kicker 47KEYLOC? Thanks!
benny  Jul 25, 2020
3 answers
It's complicated. The keyloc is Line level converter. It's the best option if you are connecting a factory head unit to a dsp by speaker wire connection instead of RCA cables. And the genius of the keyloc is that it removes all the factory eq and basically makes your factory head unit into an aftermarket receiver with a flat eq. But if you put in any aftermarket receiver it's not necessary.
brandon  Aug 12, 2020
Typically, amps with built-in DSP should be able to perform all the same tasks as this converter does but to be sure, I recommend contacting an advisor on 1-800-324-9695 to check the amp you are planning to get and if it still needs something like this Keyloc
jason  Aug 11, 2020 (Staff)
I'm not really sure. It depends on if the dsp amp also de equalizes the factory signal. It also depends on if you have aftermarket head unit or high level inputs from factory radio. I used it in 2018 Camry that had horrible factory bass roll off and this restored it to flat signal. Hope this helps.
timothy  Aug 11, 2020

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