Add amplifiers like a PRO! AudioControl LC2i-PRO overview

In order to add an aftermarket amplifier to a factory car audio system we need a way to convert the high-level (speaker level) signal to RCA low level (line level). For years the AudioControl LC2i active line output converter has been a proven solution that helps restore bass and achieve high quality signal output. But vehicle technology is advancing and along with that advancement comes new challenges that require new solutions. AudioControl's new LC2i PRO line output converter helps solve these issues! Let's take a closer look in this product overview video.
LC2i PRO: www.audiocontr...
LC2i: www.audiocontr...
Thank you to Mark from the KZbin channel CarAudioFabrication for assisting with this video! / caraudiofabrication
LC2i Pro Features:
Two channels of active speaker level inputs (up to 40V input handling)
Fixed and variable outputs with discrete level controls
AccuBASS® processing for correction of bass roll-off
Load Selection Switch
GTOTM Signal Sensing
Ground Isolation Switch
ACR-1 dash remote inluded
Compact design
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AudioControl - Making Good Sound Great

[@ThatNewYorker]

Watching in 2024 and your videos have saved me. I just finished making a custom fiberglass “stealth” but not so stealthy box for my 2016 GTI and I’m moving into the speaker wiring with the stock head unit and amp and this…is what I needed. The explaination and video unpuzzled my puzzled mind (also with a LOTtle help from my older brother s/o to him as well). He sent me to watch this. Keep doing great work man.

[@SzechuanChickenDog]

This dude is the best car audio fella on the KZbin. Just bought the lc2i pro... They should be paying him well... I'm sure he's responsible for a ton of sales

[@thetinysideoftiny7625]

This is the ONLY video that CLEARLY tells you how use and set up Accubass. THANK YOU. MUCH better than the completely unhelpful video posted by Audio Control themselves.

[@albertoc3439]

Awesome video and tutorial on how this puppy works. You are amazing and cannot wait to hookup on my Denali using the subwoofer wiring. 👏🏼❤👏🏼

[@justScrollin0627]

To me a strong, clean signal going in to your amp makes all the difference in how your subs will sound 👌..This little gadget makes that happen..

[@AudioControlCar]

Absolutely!

[@lamontkidd1871]

What's the best wire to get

[@TheRicoCallao]

OMG this is one of the best explanation videos I ever see. Thanks

[@jtfunny79]

Almost threw the pick away. Thanks!

[@TheLawlessGang]

one thing u didnt mention the regular lc2i rolls off bass under 33hz the pro lets u get that low bass down to 20hz much better i am upgrading asap

[@MrAlexH9121]

Gonna try this one out for my 2014 A3 Sportback with B&O system 🙂

[@ppipowerclass]

Holy crap. Wish I had one of these 20 years ago.

[@jamesdewer]

Got it I'm tapping into the wrong wires I'm using my rear left and right doors when I should just be going from my Infiniti QX50's sub. I thought any input would work obviously I need to rework the system and it seems much more streamlined coming from just the sub thank you! Your videos are super helpful man thank you

[@clickslidebang1871]

Doesent matter.converts highs to lows anyways

[@scarce911]

Mark's fab kitchen 👌

[@danielmorin5029]

Hi Mark, I'm from Canada, province of Quebec, and it is amazing the good job you've done with all of your video !!! If I had a chance to get internet when I was young I wouldn't blow out few 6x9 ! lolll Pretty good instruction on LC2i.

[@bryanCLXT]

watch the Video you did about just the regular LC2i. I plan on buying the pro version for an install In my ladys car !! Thank Mark for the knowledge and the time for the vid

[@DLaronsView]

This is an awesome video and helped me decide from the LC2i vs the Pro. AND using the Sub out instead of speakers on rear deck. GREAT VIDEO! New fan! Thank You!

[@paulvivier8594]

I have a 2019 Ford F350 B/O OEM sub, which color wires do I use to connect the lci2 pro? Thank you

[@jessewoodworth3888]

On 2019 f150 b&o sub wire there is 4wires due to stock sub being dual voice coil So I need to know if I am only installing one JL audio tw3 dvc sub would I use two wires or all four into lc2i pro?

[@urielsanchez1218]

so is it better to use your stock sub signal

[@BobbyMonty3683]

Man this is a great video! Glad I found it . Thank you for the information.

[@conridgecallaway9608]

Couldn't decide what I wanted to get. Was gonna change my head unit. Decided on the pro. Gonna push 2 skar ix8 subs and Memphis prx60c in the doors on a Memphis prx700.5 5 channel amp

[@RonaldKorbel]

Love it great job explaining helped out a bunch

[@kmother19]

Mark, If your side note about using the left speaker input on the lc2i if you only have one set of speaker wire tapping into a speaker, is correct which im going to check tomorrow morning. you are a god send, i was doing a install today on a friends car and got to the very end and could not figure out why my lc2i is not turning on even though i know it was connected properly and my speaker input is correct.

[@kmother19]

So when I unplug the right rca while using the left speaker input my volume goes up drastically. I ended up having to leave the right rca unplugged and only have the left rca plugged into the lc2i running to my sub amp.

[@poxcr]

Hi! I installed a JBL BassPro SL2 powered subwoofer on my 2016 Volkswagen e-Golf (non Fender audio) by tapping the front speaker outputs and connecting them directly to the sub’s high level input. I noticed the head unit output now clips at a much lower volume and it gets unusually hot. It is impossible to set the sub amp gain as the levels are all over the place and slight changes to the amp gain cause the sub to cut in and out. I verified the polarity of all connections on both ends and everything seems alright. I would assume tapping into the speaker outputs effectively lowers the impedance seen by the head unit onboard amp causing it to go crazy. Wondering if using an LC2i instead of the sub’s high level inputs would make any difference.

[@vicariousclouds2340]

May I recommend adding the subwoofer signal (mono) information to the website. I was looking for the info to know weather I wanted to pull the signal from my factory subwoofer in my 15' Chrysler 200s AWD. Wasn't sure if the single channel would be enough and not throw the "sounds" around; that being from left to right essentially. I did notice you guys had the mono hook up information but it was very limited. Thank you for specifying this information as I noticed while using the left and right rear speakers, the low notes seem limited vs my old vehicles which didnt have the factory sub. - I've had the exact same set up in nearly 6 different vehicles. Thank you for this AWESOME invention making it SO much easier to install a little extra bump without ripping my very expensive factory setup out. The Alpine setup my car comes with is very nice, but I always wanted a little more thump and bump from it. Thanks again AudioControl. Will be looking into your amps as soon as I can as well.

[@Killertomato84]

just bought one of these for my veloster turbo. I tried a kicker loc first and it really did not like my factory amp signal. Let's hope this does the trick!

[@richardbarr7191]

Excellent Video Mark. I have one question, once you configure the Bass Output and the AccuBass. Would you THEN set the gain on the AMP?

[@AudioControlCar]

Yes, you are correct. You'll want to first find the max undistorted output from your source unit, then set your LC2i Pro, then set the gains/crossovers, etc. on your amplifier. Hope this helps, and happy holidays!

[@chrisaguirre7018]

@@AudioControlCar quick question I'm setting up an install in a factory bose car. Do I need to unplug the factory speakers when running test tones to set my gains?

[@bobit8742]

where do you install that 1amp fuse for the 12v power wire?

[@notadoctor2598]

As close to power source as possible

[@DisadvantageRL]

So I've just installed the Lc2i pro in my new system. I kept the stock head unit, I only added a sub and I spliced into the left rear speaker inputs. I cranked my volume to 75% ( my speakers are quiet even for stock btw). So, I start turning the bass output level, and I hit the max but with no maximized light. I assume the signal just doesn't output enough because the speakers are quiet even at max volume. I left it at max, and then moved on to the acubass, turned the threshold all the way up and never got either light to come on, when I turn the acubass level to max, still no light. I finally said I'll leave It all at max, now the acubass decides it wants to cut on whenever and my L7 q-class will BLAST for a few seconds and then the feature turns back off. To clarify, this is a head-unit problem correct? I want acubass to stay on constantly while music is playing even if I turn the acr-1 all the way down. I've even tried turning up the head unit bass level but then the speakers start to distort. Do I need to replace the head unit (I really don't want too)

[@zachmoore6009]

I had the same issue I just turned the volume up on my head unit then started getting the max light. But I was damn near at full volume but I also have a shitty 2014 Silverado ltz factory radio so it’s a total turd

[@lastamericanhero59]

Guys you have to put out more content.

[@AudioControlCar]

Thank you for the feedback! We are working hard to put out more video and social media content than we ever have before. Thank you for being patient and supportive while we get things rolling!

[@LuiBove]

Excellent video!! Thanks for detailing this, I am about to install 1 of these in my 2019 Rav4, without Premium audio, & I do not have a sub output from stock head unit. I plan on just adding a powered sub, do I just tap into front or back full range signals, & use the bass output signal?

[@Newyen6MT]

How about the gain on the amp? What do I set that too when setting the bass output level on LC2i Pro?

[@DisasterInExile]

Do you turn the head unit all the way up to set the level?

[@jayf568]

Where do I get the 12v constant power from? The battery?

[@gillmccuddy]

To set the accubass correctly how do I know if the head unit is rolling off the base or not? It's hard to tell by ear.

[@MrGchalifoux]

What gage of positive wire do I need coming from the LC2 and Is it a fused positive wire? Do I connect it right to the battery?

[@sp00f34]

you can connect it to the amps power / ground with a 14 guage wire. the power line between the amp and the power in of the lc2i should be fused with a 1amp fuse. HEY i finally answered something about car audio. guru status

[@normancervantesgar]

Damn these people didn't know how to install my LC2i pro and my nob don't work I was wondering about that and they have the subs on the wrong way thanks for this video im going to be working on my installation myself

[@Cawpbell215]

That thing looks swell

[@AudioControlCar]

Thank you! We think so, too.

[@jordandllrd]

Question? When im setting my bass output on the lc2i pro. Do i need to turn the bass knob all the way up or down? Or does it even matter?

[@patricklim3703]

GREAT VIDEO! - So, question....since now I'm going down a rabbit-hole....lol. I recently followed your video to an exact tee and coupled this with the instructions on how to set up my sub amp (JL Audio 500.1). Now, I recently found some info on using an Oscilloscope to SET proper GAINS. Do I still need to get one if I followed all you instructions in the video or does this negate the need for an Oscilloscope?

[@dougkampfe7285]

I have a premium stock amp that uses fiber optic back to the HU them the HU control is pushed out to speakers 12 , In using the audio control unit I am begging the question , is there any back feed and reverse polarity that will damage the OEM premium amp or cause the OEM amp to react abnormally with the addition of The LC2 on the system

[@HI_grade]

Awesome video, Just what i need

[@jf27437]

Lots of amps accept high level speaker signals now. Why not just skip the LOC?

[@KobraVI340]

Awesome video. Great and direct info. All I’m thinking is with some factory stereos there are no eq’s. What’s your fix?

[@carsonbrown1498]

Where should I be doing the 12v connection to power the unit? Could I just wire it from the positive terminal on my amp since that's 12v constant? Or do I need to find a wire somewhere in the car to splice off of?

[@rickythompson3905]

i’m having the same problem right now did you figure it out?

[@jdzomba8305]

Hear anything ?

[@djcorewrecked]

I would use a distribution block to tap off the larger gauge 12v source that is from the battery.

[@mattford72]

When running test tones for mids and lows. Do I need to adjust stock stereo bass/mid/treble to zero?

[@gillmccuddy]

Is it true you can just use speaker wire inputs to the audiocontrol amp and not need rca in to amp

[@andrekrausz2407]

Thanks for the video. Unlike your example, I want to connect BOTH main and bass to 4 channels of amplification. So, according to the manual, the ONLY difference between the two is the bass output has a non-defeatable low pass filter and the output level can be controlled via the remote knob?

[@jaymodesto2383]

If your amplifier comes with a dash control knob too, which should dash control should be used? The ACR-1 or the amp's knob?

[@AudioControlCar]

Depends on the amplifier make/model, but generally, we would recommend using the ACR-1.

[@gol10dr45]

Nice job with this video. This sounds like what I exactly need for my new Ram 2022 2500 with basic 6 speaker system!! What shall I do if I want to run a 5 channel amp? Which input? Fronts?

[@biggdofficial]

I respect and love audiocontrols equipment so far iv purchased the matrix, lci2 pro, micro epicenter. I recently swapped out the epicenter for the lc21 pro, but I been having trouble with getting it to transition without noticeable change. I get just over halfway on the volume and it kicks in with jump, like the bass kicks and a split second later it jumps up to add bass. what am I doing wrong ? I do love the quality ov sound it reproduces. I run 2 12s in a sealed box.

[@Hvac.tools_]

which lci pro should i buy if i want to tap both subwoofer and midrange speaker sending outputs to two sperate amps

[@tylerkania4247]

You jump the wires from the head unit right into the lc2?

[@nibelungvalesti]

Bass restoration triggering is pretty bad, tbh. I rather just disable it and turn up the gain. It triggers too inconsistently, and the delay sucks.

[@JUSTINWILBER]

I agree it's like it jumps on and off and may be hard on the sub

[@gelatoconnoisseur5389]

So to be clear I can run a 4 channel amp and a mono amp at the same time right?

[@bilosan]

How to install 2 front speakers and 2 rear speakers and 2 subwoofer underseat With 2LCI -PRO?

[@darrylabney]

I’m looking to add an amp for the door speakers! As well as the sub will this work

[@tminusoftexas3224]

Do a six channel set up

[@ADD1distraction]

@Mark. Where can I find a schematic for my vehicle's audio wiring? I need to find a solid spot to tap in to for my LC2. Thank you for any help.

[@zacholtman7849]

Hope you respond! I need help. JD1000.1 pushing 15" Kicker CVX, with LC2i 1000 x 2 = 2000. sqrt2000 = ~44.7 = target voltage So I: -75% volume 50hz test tone -Set LC2i just a hair before 'maximized' light turns on. -Amp gain all the way down still reads about 56, higher than voltage. (ALSO - do I set inputs to low level when running from LC2i? - is this where my issue lies?) BUT, if I set gain to hit the clipping indicator light on the amp itself, the voltage reaches like 75. As of now, it sounds way underpowered. I had a 12" with 400 watts and that was louder. I'm not sure what I'm doing wrong and what I'm missing. A little confused why these two numbers would be vastly different - target voltage v. clipping light voltage.

[@shanyonthetwin30]

I have LC2I PRO . IT WORKS GOOD . BUT WHEN I TURN THE CAR OFF IT MAKES A DEEP BASS SOUND THEN CUT OFF .

[@WireHarnessAssembly]

👍👍

[@mamadoufofana7019]

Can I use Lc2i on aftermarket radio if yes the installation will be done the same way as the factory radio

[@K_Vang23]

So I have two remote bass knob. One is the RF T-1500 BDCP PEQ remote and the other is for LC2I pro remote bass, which one should I use?

[@TheGronk78]

Doug Demuro of car audio

[@nasoccerplayer311]

Thanks for the video, great stuff.I have a question about my current build. I have AudioControl LC7i Black 6-Channel Line Output Converter, 2 after market amps(4ch amp and 2 ch amp(for subs) connecting to a factory Ford radio(i have no choice of using an after-market radio). I'm running 125watt rms to the doors(4ch) so I will use after market speaker cable, not factory internal speaker wire. So with this, im thinking these speaker wires will connect from 4ch amp to the door speakers, which makes sense but my question is where does the 2 sub speaker wire connect from the LC7i to the harness(im using PAC LPHFD31 harness) as the harness will only have the 4 pairs, not 6 which I would need?

[@robdingosaenz5556]

They way u explain it- it seams like u can only add 1 amp. Either bass amp or highs amp only. Is this true??? Or can u add front rt n lt speakers n have highs amp n bass amp- both??

[@adamdorris4081]

I don't like those slots in the remote and 4 screws. Like the picks though.

[@corndog2181]

I'm going to add two 12-in Kicker competition R's to my 2022 Palisade calligraphy Edition. It has the Harman Kardon 630 watt system with 7.5 inch subwoofer in the rear. Going to buy the LCI 2 Pro to tap right into the existing wires in the luggage compartment. will the LCI 2 Pro handle the already crossed over signal. Do I need a DSP? I have very little punch and almost no real low end. The base roll off is horrible in that system as well.

[@itsdawsonpotter]

beautiful video

[@mamadoufofana7019]

Hi mark I have a question can I use the same installation with a after market radio # Tesla screen thanks

[@noealvares6149]

So with the lc2i pro I can add both a monoblock amp for bass and 4 channel for mids and high’s?

[@ericsohood25]

I need to know the same thing

[@noealvares6149]

@@ericsohood25 you can I got my system installed with both amps on the lc2i pro

[@adrianadalbertopadilladelv2070]

About to try this soon, I wired my lc2i pro with the two front speakers, currently only have my subs with amp , I’m adding a 4 channel soon , can I use the lc2i main outputs for the 4 channel amp? Even though the lc2i is only grabbing the front speakers outputs? Basically asking if I can wire all 4 door speakers using the output of the 2 front ones

[@AngelGonzalez-mj6qh]

Hi, nice video but i have a caution about the remote for the lc2i pro and what happen if the amp have a remote too? So wish one i will use?

[@mediocrefloridaman]

Your preference

[@Rolandyeslek]

Does it only do signal for Bass or can the LC two pro do mids amp

[@ChiTownBossFJB]

Hi I just hooked up the lc2i and my mono amp and sub. The lc2i only turns on when I turn my volume up loud. Isn't it supposed to turn on just from the signal? Please help!!!

[@Frank-hg9rl]

Hi, nice video! Could you use both outputs at the same time? Got a amp for the mid and high frequency, and a mono amp for sub.....

[@fierymonkey]

If I have a audiocontrol acm-1.300 do I still need lc2?

[@guidoftc8304]

How can it help with bass when I don't have a sub in my set up but still getting bass but it roll off

[@jamessong5838]

If i have aftermarket head unit... Do i still need this LC2i-Pro?

[@richardrhoads9088]

If I already have a remote bass knob on amp should it still use the knob for the lc2ipro?

[@Jace-fo3yc]

With the remote out wire to the sub amp can u run a nothing wire with that to a second amp?

[@anthonybiff92]

Great video! I am looking to get the pro version for the load resistor’s for my challenger. Does the lc7i have load resistors like this one? If not, what are my options as my factory system does not have a full frequency range signal? Every speaker in the car has a different signal (tweeters, mid base and factory subwoofer)

[@artoferof7580]

Let’s say I get a lc2i pro with an amp for 2 subwoofer. Can I install an audio control epicenter but also use the regular bass that the amp has for the subs? Or that will burn the bass amp? (Idk if I explained my self)

[@mrjonhdenn]

Can you use remote out for 2 amplifier s and question since upgraded my components speakers with my stereo off tweeters noise making me crazy 🤪

[@tothepoint4240]

If your amp has speaker level inputs is it still recommended to have a loc?

[@sierraproductions9662]

So would this work on my ford f150 with the sync 1 sony sound system

[@arn_thegreat]

Hey Mark how are you. Question can i tap into my factory subwoofer 🔊 wires on the rear on my car or is it better to tap in from the harness before the factory amp ??

[@bradleythompson7609]

Is it possible to use the full range and subwoofer outputs from this unit at the same time? Want to add subs and replace the 6x9s in my rear deck with a amplified set

[@djcorewrecked]

Yes of course

[@outkast2626]

Can I use 3 channel's of a 5 channel amp woth this ?

[@kitkimbrough1145]

How does the acubass get adjusted when using the bass knob!??

[@shoten69]

Hey Mark, great video. Perfect information. I was thinking in my head - "what input should I take from the factory system - sub or rear speakers". But then you covered it off with the advice to take the sub input into the LC2i. In the past, I have used the rear speaker wires, and then had issues with fading from the head unit, if I faded towards the front, my sub was not getting all the volume it could use. So with my new system, I have a factory sub, so I will be using that input into the LC2i. One question for you. I have an MTX RFL 12" SVC, and the MTX 4001D amp. I am worried about the sub being under powered at 2 ohms. Do you think it will be ok? Great channel - keep up it up!

[@cnote6010]

Great video.. do i set my amp gains first or do i set the LC2I first then tune the amp?

[@mediocrefloridaman]

Set the lc2i up first and then the amp.

[@cnote6010]

@@mediocrefloridaman thank you big time!!!

[@journeyman291]

And then there's us folks that bought a Toyota hybrid and find out we can't add amps to our cars! Am told that there's only a extreme maximum of 30amps available for added accessories. So either i can add a small sub or a small 4 channel amplifier. Not both. 😢

[@kendrickcontent]

How much clean output volts this put out?

[@Thejonpedersen]

Can I use any type of copper wire to tap into subwoofer signal

[@Raptor178]

How’s it going hope you see this message to help me out. I have a 2019 Yukon slt I am looking to upgrade the audio but keep the factory head unit. The setup I plan on going with is a Jl audio 900/5 Hd amp with jl audio c2-690 tx for the front door and jl audio c2 650x for the rear they are coaxial speaker with 1 12” jl audio w3. Will I be able to run this setup with LC2i Pro?

[@raidersperez1278]

I bought the regular lc2i before I knew about this pro. I know you said it’s a little bit more difficult on the regular but still possible ? I tried to get a refund but they aren’t letting me I should have waited to buy the pro.

[@DexKing100]

i purchased an LC2i pro at a garage sale for a few bucks. its new in the packages, doesnt appear to have ever been installed or used. however, it's missing the ACR-1 knob control. do i need the knob for this unit to function or can it be run without it? Also, can i pull signal from the rear speakers themselves for my sub, or will it require connection from the back of the stock head unit?

[@edwinkarani5593]

Will you need a cross over when you are using LC2ipro?

[@cheienebrito9120]

one thing my rear speakers are controlled by an amplifier which doesn't send bass signals they only send mid range frequencies i want to put the lc2i to play my subwoofer the lc2i transforms the signal so i get bass?that you!!!!

[@zookinthe6ix461]

Are you supposed to use the remote in or out option. For the older lc2i

[@TTGPATCHER]

How do you add more rcas for more amps ?

[@TheGwahlers]

I am currently confused on exactly how I should wire this with an 18 speaker Ford Unleashed B&O stereo system. I wired it from the subwoofer but it really seems to be all these crossovers working against each other. I received some advice to use a side speaker but the crossover cuts off some of the deep lows for that speaker. Kinda puzzled. Anyone on here have any insight?

[@cofiking23]

i have an old nakamichi a1 amp which i want to connect with subwoofer. I don't know what those ground controls are but i think my amp is grounded. Anyway would this be a good device for my home system?