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6-channel line output converter with bass restoration — adds aftermarket subs and amps to a factory system (White)
Our take on the AudioControl LC7i by Crutchfield's Buck Pomerantz
Want to add your own speakers, subs, and amps to a factory system?
AudioControl's LC7i 6-channel line output converter (LOC) with bass restoration allows you to add aftermarket amps, speakers, and subs to your car's factory radio, so you can enjoy better and more powerful sound without losing climate controls, voice-activated functions, or other built-in factory features. The LC7i accepts speaker-level signals, so you can use it with just about any setup, even high-powered amplified systems.
The LC7i sums its input signals together, even if they've been crossed over for tweeters, mids, and subs by the factory system. That way, you can count on a strong, smooth, full-range signal for your processors and amps. The LC7i features six RCA preamp outputs that'll handle a traditional front/rear/sub setup.
Why you have to restore the bass
Many factory radios actually turn the bass down as you increase the volume to protect the cheap factory speakers, subsequently removing much of your music's power and punch. AudioControl developed a patent pending AccuBASS™ circuit that restores the bass the factory radio erased, giving you much fuller and more enjoyable sound. The AccuBASS is applied to the subwoofer output channel, so your sub amp can have the entire, restored signal to work with.
Level-matching with an LED indicator
AudioControl makes it easy: set your factory stereo to about 3/4 maximum volume, turn the output level control of the LC7i until the "Maximized" light begins to flicker, then adjust the gain controls on your amps and you're done. You've level-matched the output of your receiver to the amplifier's input, so you can count on getting maximum performance and minimum noise from your system.
The optional dash-mounted ACR-1 wired remote allows you to adjust the volume of the bass while you're on the go. The speaker-level inputs sense incoming signals and turn on the LC7i, while a built-in 12-volt trigger turns on your amps as well. If your factory system only has channels for front and rear speakers, AutoMode™ will create the output you can use for your subs.
This is the second vehicle I have installed the LC7i in. My latest vehicle is a 2017 2500 Silverado Duramax, with the factory Bose system. Used the LC7i to integrate a 5 channel amp to drive (4) Alpine type R component speakers and a 10" sub. Works and sounds awesome.
Robert, Upland, California
What's in the Box:
- 6-Channel line output converter
- Owner's manual
- QC checklist
- 6-channel line output converter (Sierra White)
- designed to work with any factory stereo
- 6 speaker-level inputs (each can handle up to 400 watts RMS of power)
- AccuBASS bass restoration circuitry
- 6-channel preamp-level outputs
- AutoMode creates subwoofer channel when needed
- level matching controls
- maximum output level: 8.5 volts RMS
- internal signal summing available when used with factory systems with crossovers
- optional wired remote subwoofer level control
- signal-sensing turn on
- 12-volt 1-amp turn-on lead output
- recommended fuse: 2-amp
- dimensions: 7-1/2"W x 1-5/16"H x 6-3/8"D
- warranty: 5 years
- Our 60-day money-back guarantee
AudioControl LC7i Reviews
Average Customer Review(s):
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Six Channel Line Output Converter: The AudioControl LC7i is a six channel active line converter which allows you to keep your factory installed source unit in your vehicle and still dramatically improve your car audio system performance. The LC7i accepts up to six channels of speaker-level signal from factory installed amplifiers or a source unit and converts it to a high quality, after market low-noise, pre-amp level signal that can be fed to amplifiers and speakers.
AccuBASS: The LC7i fixes one of the biggest letdowns of today's factory systems, weak bass. Designed for maximum sound quality and enhanced audio performance, the LC7i incorporates AccuBASS. This patent pending process automatically corrects for the bass roll-off that is common with many factory-installed audio systems and AudioControl's unique and exclusive AccuBASS patent pending circuitry maintains and restores the Bass as the volume is turned up, improving the audio performance.
Speaker Input: The speaker level inputs are compatible with nearly any factory stereo system, even most Bose systems. There are 3 pair of inputs that will accommodate up to 400 watts.
Channel Summing: The LC7i has the ability to sum together multiple input channels (4 or 6) from the factory source unit into 2 channels. This is handy when the factory system has multiple, actively crossed-over signals sent from the OEM source unit or amplifier(s). For example, in some vehicles there is an actively crossed-over tweeter, midrange, and woofer all in the front of the vehicle. The LC7i lets you take all of those signals and sum them together to get a high-quality, full-range, pre-amp signal without the use of any additional cables or hardware.
AutoMode Inputs: When there is no signal present at the channel 3 input, the channel 2 input automatically feeds the channel 2 and channel 3 outputs.
Output Level: The +/- 12 dB output level allows you to adjust the head unit's voltage to the top of your amp's input range; up to 8.5 volts RMS. Each of the three pair of RCA outputs has its own level adjustment.
Auto Turn-on: The main speaker level input has a signal sensing circuit; the unit turns on when there's a speaker level input signal and turns off when the signal disappears.
Ground Isolation: The power supply ground is switchable, in case of ground loop noise. The factory position is fully isolated (typically the best choice), but can be changed to Ground or 200Ω.
Remote Output: The +12 volt DC remote output will trigger an amp to turn on whenever the LC7i is on. The remote's maximum current output is 1 amp.
Terminal Blocks: The power/ground/remote in/remote out terminal and the speaker level input terminals are removable; the wiring is attached to the block, then the block is plugged into the LC7. The terminal blocks will accommodate wire up to 12 gauge.
Optional Remote Control: Using the optional ACR-1 wired remote (161ACR1, sold separately) you can easily adjust the output level of channel 3 of the AudioControl LC7i, often used for a subwoofer. The remote is designed to be dash mounted, within reach of the driver; it can be mounted under the dash with the supplied bracket, or the bracket can be removed and the knob and LED can be custom mounted through the dash
- Maximum Speaker Level Input: 400 watts (at 4Ω)
- Maximum Output Voltage: 8.5 volts RMS
- Frequency response: 10Hz-22kHz
- THD: 0.01%
- Input Impedance: 20 kΩ
- Output Impedance: 150 Ohms
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.
Product reviews from the Crutchfield LabsWhat are the Labs?
Why did you buy this?
To keep factory radio and add 2 amps system to my car. [ Juan C. Jan 16, 2017 ]
I have used this on two installations for Sprinter Vans, very good price and really cleaned up audio from stock stereo system that was very poor quality. Wired it into a decent 5 channel amp and ended up with very good sound. [ Korey Jan 09, 2017 ]
After speaking with Norm this was the best thing to add to Oem radio to add subwoofer. [ L Dec 23, 2016 ]
I wanted to keep my existing stock radio in my 2015 accord but and a little bit more power to the radio with my JL amps. [ THOMAS A Dec 23, 2016 ]
Wanted to have the option to upgrade my car speakers in the future. I purchase the LC2i before but returned that to buy this [ Victor Dec 21, 2016 ]
Better factory sound. Eliminate hum from cheap converter [ Troy Dec 10, 2016 ]
Heard great reveiws about this product. Upgrading a factory unit. [ Richard Nov 30, 2016 ]
Great add on... [ ron Nov 20, 2016 ]
This allows me to add aftermarket amps and keep my OEM touchscreen in place. OEM look, aftermarket performance! [ M Sep 30, 2016 ]
Saw a youtube review. [ Rosa Sep 29, 2016 ]
to get a better sound simply because im using my factory stereo [ trinidad Sep 11, 2016 ]
I wanted to get a better bass sound from my subs and after market speakers with the two Amps and Capacitor that I have installed with the factory head unit. [ Juan Alberto May 12, 2016 ]
Allows me to not have to splice my entire harness in my new truck in order to enjoy products from Crutchfield. [ Kenneth Dec 17, 2015 ]
6 questions already asked
I am very happy with the Lc7i installed in my vehicle my sound system sounds great [ FRANK Sep 19, 2016 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy Sep 01, 2015 ] Staff
2 answers I have a six channel highs amp running separately my two front tweeters on two channels, front Mids another two channels, rear Mids on the last set of two channels...and a mono bass amp running two subs....will this product be able to run all these separately as my highs and mono bass amps do ? [ paul Jun 04, 2015 ]
Yes. It modulates every input from the receiver. So unless you have 2 head units then you're good. [ MICHAEL Jun 04, 2015 ]
No .... this product is for create an extra channel in factory radio and create RCA output. [ GERARDO Jun 04, 2015 ]
I forwarded your question to an Advisor and they responded with the following: The terminal blocks will accommodate wire up to 12 gauge, but this device uses very little power, and you could also use just speaker wire as well. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Apr 13, 2014 ] Staff
3 answers I'm going to run my front speakers to Channel 1 and rears to Channel 2. I understand that Channel 2 will send a sub out signal to channel 3 line out. However, will channel 2 also output line level at the same time so I can run it full range to my amp to power rear speakers? Thanks. [ Bill Apr 29, 2015 ]
Yes, that is exactly how this unit functions. You can also just run a single stereo signal and it will pass that to all 3 outputs. [ Samuel May 02, 2015 ]
Yes. That's exactly what I did and it works great. I'm running all Alpine amps, front and rear speakers and a sub. Channel 3 signal to a mono amp and the front and rear signals to a 4 ch amp. The LC7i allows you to dial it in the amps perfectly. Great product. [ Bruce May 01, 2015 ]
Yes, channels 1 and 2 have their own low level output. In addition to these, you will have an extra low level channel that you can use for your subwoofer amplifier. You can run 5 channels out of the lc7i by only inputing 4 high levels. [ A N May 01, 2015 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the install. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy Jun 15, 2014 ] Staff