Add Amplifiers to a Factory Audio System – AudioControl LC7i Line Output Converter

Today’s newest vehicles have more and more vehicle control systems integrated within the factory radio. This means we can no longer simply replace the stock radio in a vehicle to add aftermarket amplifiers. So how can we use a stock radio or amplifier for signal for our new aftermarket amplifiers? The LC7i!

Have a question? Leave us a comment below!

Learn more about the LC7i here:

See our full line of system upgrade devices here:

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LC7i Features:
Six channels of active speaker level inputs – accepts up to 400 watts per channel
Patent Pending AccuBASS™ circuitry
Optional ACR-1 Remote allows for user control of the subwoofer level
Internal Channel Summing – For interfacing with factory installed amplifiers with built-in crossovers
GTO™ (Great Turn-On) Circuit – Powers up the LC7i when it detects signal on the speaker level input
Output level control
Compact chassis allowing for ease of installation

AudioControl – Making Good Sound Great


  1. TheReverendAssclown on July 17, 2021 at 9:27 pm

    Thank you for this. 2 questions: 1. When there is a factory amp present, do you just tap into the wires coming in and out of that amp? 2. Do you disconnect anything from the factory amp? It seems that if the answer to #1 is yes, then you’re going to have audio going to the speakers from both the factory amp and the aftermarket amp.

  2. Mark Taylor on July 17, 2021 at 9:30 pm

    I’ve never seen anyone that looks more like a “Mark” than this guy and my name is Mark. Great video.

  3. Brandon Lee on July 17, 2021 at 9:31 pm

    Btw, my AudioControl LC7i is pissing me off, aka disappointing if anyone cares. I’ve watched every video and read every piece of relevant literature on it and have not been able to tweak it to optimal performance. An in-depth troubleshooting explanation is lacking or nonexistent. E.g. Why is it ineffective unless maxing out every Accu Bass dial? I recommend adding a new in-depth informative video. Feel free to ask me about which issues I’m having and am referring to.

  4. Kamil10 Kamil10 on July 17, 2021 at 9:31 pm

    does accubase adjustment work only with channel 3 or on all outputs?
    also can i use lc7i with 4 coaxial speakers connected to channel 1 amd 2?

  5. Nate Y on July 17, 2021 at 9:32 pm

    i want the factory amp to control factory speakers and my aftermarket amp to control my sub

  6. Hennessy * on July 17, 2021 at 9:33 pm

    Hello the iLOC7 … this line output converter will ENHANCE the BASS and SPEAKERS?????

  7. ZR1Terror on July 17, 2021 at 9:34 pm

    Do I need an LC7i for a 2018 Ford F-250?

  8. Oxtaviox on July 17, 2021 at 9:34 pm

    Do you have 4 mid ranges? or only 2?

  9. K H on July 17, 2021 at 9:37 pm

    I should have just upgraded to a new HU , this LC7I is wasted money @time

  10. Randy Bremer on July 17, 2021 at 9:45 pm

    And if I don’t have any RTA to find out about my outputs what can I use?

  11. fernando orozco on July 17, 2021 at 9:46 pm

    I see that I have only 2 speaker cables to the 3rd channel the subwoofer that okay ? If it is im goo

  12. anthony richmond on July 17, 2021 at 9:47 pm

    would this be an issue to hook up in a tesla?

  13. Brandon Lee on July 17, 2021 at 9:48 pm

    Why has my LC7i Remote Output stopped working? (I am using a remote input wire, not GTO)

  14. Darks D on July 17, 2021 at 9:48 pm

    So I’m lost on one thing. If im only hooking up a subwoofer. Should I be splicing into all the level inputs? Does it sum the bass output? Or is this overkill for that task?

    I want to maintain the speakers being powered by the factory amp for the time being, but I want to make sure this thing wont rob power from them.

  15. Felipe Ceballos on July 17, 2021 at 9:49 pm

    Great video!

  16. Slappa Da Bass on July 17, 2021 at 9:49 pm

    Not sure if this is needed if you are simply adding an amp to boost the speaker sound to you factory unit

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  18. dcaudio1 on July 17, 2021 at 9:57 pm

    Definitely gonna get one of these…i have a factory Bose system in my 2015 GNC sierra without a subwoofer. It sound just ok but no balls on the low end. It definitely has the divided frequencies coming out of the factory Bose amp. My goal is to replace all the speakers and just keep the stock head unit. initially i will add 2 8" subs with 300 watt amp and eventually get the audio control LC 5.1300 to run the entire system….i do realize with that particular amp does what the LC7i does internally so i wouldn’t need the 7i at that point so my installation with accommodate both of these installations…..

  19. Roy Singh on July 17, 2021 at 9:58 pm

    I have a 2020 Honda crv touring, which has a subwoofer,do you know if this will work and where is my amplifier located? Thanks.

  20. jake stokes on July 17, 2021 at 9:59 pm

    my remote turn on for other amps is only turning on one amp

  21. rich f2 on July 17, 2021 at 10:00 pm

    How can I measure what voltage is coming out of the lc7i gain ?

  22. Marshall jay on July 17, 2021 at 10:01 pm

    Hi bro! I got 2017 Chevy Impala premier, I want to replace all the stock Bose speakers should I get the lc7i? With aftermarket amp?

  23. Gio Gio on July 17, 2021 at 10:02 pm

    The set up that’s gotten my subs the best signal have not been a factory with line converters. Let me know if there are converters that go over 400 watts. I’m trying to get the most out of an aftermarket 4K watt amp starting with a loud / clear enough signal. I have peq 70 equalizer with a sub output that doesn’t get enough signal with a converter

  24. Chris Daniels on July 17, 2021 at 10:04 pm

    this is great. i’ve had this nightmare problem for 2 years

  25. ambulldog111 on July 17, 2021 at 10:06 pm

    Seven eye with an aftermarket head unit? I originally got the LC7i cuz I kept my stock stereo but when my stock stereo to sit on me I got a Kenwood and left the LC7 I hooked up because when I tried disconnecting it and running my RCAs from my head unit straight from my amps it didn’t sound good sounds way better with the LC7i

  26. Deante Patton on July 17, 2021 at 10:07 pm

    What the white wires connected to?

  27. deairreo hill on July 17, 2021 at 10:07 pm

    Do I need a 6 channel amplifier if I’m doing 3 way , wofer mid highs?

  28. Darrell Patten on July 17, 2021 at 10:08 pm

    where does the after market amp come into play here? it would be smart to show everything …… like i know the rcas go into the after market amp but where do i connect the after market amp to the new car speakers i installed in the footwell so i can control that bass.

  29. Luis Aceves on July 17, 2021 at 10:08 pm

    Thank you Marc! Your teaching is excellent information for my project

  30. James Woodard on July 17, 2021 at 10:09 pm

    Will this work in my challenger to by pass the factory amp I have the alpine 6 speaker system I’m wanting to replace stick speakers with better an add an amp along with sub an amp in trunk

  31. Justin Troy on July 17, 2021 at 10:10 pm

    All this is confusing me. I have a 2018 Nissan Titan. It has 2 speakers in the dash, two in the front and two in the rear doors. It’s the stock setup no sub or amp.
    I’m wanting to put all new speakers, two 2 3/4 in the dash. 4 6×9 component speakers in the doors. So one six Channel 600 watt amp and one 500 watt mono amp for the sub. So I’m trying to figure out what all I need for this. Do I need the LC6i for that? Do I run two separate RCA lines for that? Just confused. I’ve never retained the factory radio before. So I don’t know the process.

  32. ReggaeDubSoundSystem on July 17, 2021 at 10:11 pm

    My Infiniti G37 has 12 speakers and 2 amplifiers, how would I use this? The 2 front doors have 3 speakers each, the 2 rear doors have 2. There is also a center channel and a subwoofer. I dont need to use the rear sub, and dont mind running the center channel off of the stock system. Would this only work for the front door speakers? Someone please help.

  33. bartowflorida on July 17, 2021 at 10:11 pm

    I’m glad I watched this. Saved a bunch of money. I have a sound processor that only has a single pair of rca inputs, so I can sub everything to the main output and send a full range signal to my processor input

  34. Auto Max on July 17, 2021 at 10:11 pm

    tôi rất muốn học ở anh . người anh tuyệt vời

  35. Melvin Moodswings on July 17, 2021 at 10:12 pm

    I need help..I have a db amp…on my subs..fosgate amp on my door and rear speakers and tweeters and the LC6i …..fosgate tweeters…fosgate door and rear speakers…2 12in kicker cvr subs….I’m getting frequency coming through my speakers whn the car is off…sounds like data or something…the tweeters started out strong and now is sounds like they have gone out..but they haven’t..its like something is blocking the potential of the tweeters….I have spent a grip on install and components…it sounds like crap…can anyone help me…

  36. Kenrick V on July 17, 2021 at 10:12 pm

    I have a Mercedes HU output with 2 optical lines to the Harman Kardon Amp, do you have any solution to delete stock Amp?

  37. John Gray on July 17, 2021 at 10:13 pm

    Any interest (or car audio friend?) in a complete overhaul video for a stock 2013 Camaro convertible sound system? 2 lower door speakers, 2 tweeters, 2 small rear panel speakers and a subwoofer. I’m between two ideas: keeping stock stereo and adding LOC and amp for all aftermarket speakers, or replacing everything all at once. Located in NJ, just have never found a good video on this year, make and model.

  38. Thedjrush on July 17, 2021 at 10:14 pm

    Hello I only have 4 channels on stock radio and I’m limited on the rear signal to midbass and low frequencies if I want to add a 4 channel amp and and sub do I just use the summed output for the 4 channel amp and the lows for the subwoofer output?

  39. Natchitoches Parish Library on July 17, 2021 at 10:16 pm

    I have a 2 channel amplifier on my highs (6.5 components: midbass and tweeter L&R and rear deck has coaxials L&R. I also have a sub amp on a DVC 12". How would I wire this correctly including the jump switches? My components are at a low volume while rear coaxials are OVERPOWERING my components up front. Thanks

  40. Adante Paige on July 17, 2021 at 10:16 pm

    Does my anyone know how to add 4 channel amp to stock radio Chevy impala 2019 I’ve heard the headunit caused distortion when connected to a am amp.the subs are hooked up

  41. Mr. T on July 17, 2021 at 10:17 pm

    Do I still need a crossover on my Sub woofer output? Does the unit subwoofer output (channel 3) has a low pass output filter built-in? If not what do I need to replace with? My subwoofer amp has a full range output only.

  42. Felipe Rivera on July 17, 2021 at 10:17 pm

    Can I add this to a 2008 Lexus LS460 with mark levinson system to improve it and add a sub and amp for extra bass? Would I need more than 1 LC7i?

  43. Christopher Pahl on July 17, 2021 at 10:19 pm

    So would the midrange signal come from the 6.5-inch woofer in the door or the small midrange speaker in the dash? The Midrange speaker and woofer confuse me!

  44. clemsontigz1 on July 17, 2021 at 10:21 pm

    This nigga has a problem wit his S’s .

  45. gin ngo on July 17, 2021 at 10:22 pm

    Thank you Mark The Jedi Car Audio Master. Always amazing content, lessons, tutorials, & explanation. So gracious & humble.

  46. Akeel Shah on July 17, 2021 at 10:23 pm

    so technically i could use my a channel for my mains and use b channel of my home power amp connect it to the high level inputs of the lc7i which would give me the ability to connect my pioneer 9601 monoblock car amp for subwoofer output without chucking mids and highs to the sub perfect . correct me if im wrong

  47. K H on July 17, 2021 at 10:24 pm

    Hi Mark, I’m trying to get decent sound from my stock hu clarion cv729cm, notoriously criticized system from subaru. Replaced f/r door speakers with 4 Alpine s-s65 powered by alpine PDR-F50, added 1 sub 12" rockford fostgate punch P2D4 powered by rockford fostgate R500X1D , Audio control LC7i, kilmat sound deadening doors and trunk, custom fglass sub box, premium wire, blocks and cables. Getting a hum or buz at low to no volume as well. Any suggestions, I’m ready to take it to a shop

  48. Charles Moser on July 17, 2021 at 10:25 pm

    I have a 2012 genesis sedan with the lexicon system I replaced all the speakers in the doors and the deck and the 8” subwoofer . I was told to run all new Wireds to the trunk by the stereo shop that is local. Which means I did not hook new speakers up to the wires that run to the factory amp. Which I did to bypass the factory amp. I’m not understanding by doing this. How do I hook it up if I’m bypassing factory amp . I’m putting two amps in. A 5 channel amp for factory speakers and the factory sub that was replaced and another for 2 12”s . Plz help. I’m lost

  49. Crux Interfacing Solutions on July 17, 2021 at 10:26 pm

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  50. Jo Gutierrez on July 17, 2021 at 10:26 pm

    I have a 2019 4runner non JBL factory system. Keeping the factory radio. I have bought Focal flax component speakers for the front. I also have Focal flax coaxial speakers for the rear doors and Focal coaxial ICU130 for the rear hatch. What would be the best set up as far as amps, etc..?