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8-channel car amplifier with digital signal processing — 40 watts RMS x 8

Item # 109DSP4086

One of the best ways to get superior sound fidelity in your car is to add an amplifier to pump up the power, along...

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One of the best ways to get superior sound fidelity in your car is to add an amplifier to pump up the power, along...

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About the JBL DSP4086

Digital signal processing for the win

One of the best ways to get superior sound fidelity in your car is to add an amplifier to pump up the power, along with a digital signal processor to fine-tune the sound quality. JBL's incredibly compact DSP4086 8-channel amp/processor will do both, providing eight channels of 40 watts RMS while sculpting the sound with powerful tuning software using your Windows PC.

Digital signal processing for the win

One of the best ways to get superior sound fidelity in your car is to add an amplifier to pump up the power, along with a digital signal processor to fine-tune the sound quality. JBL's incredibly compact DSP4086 8-channel amp/processor will do both, providing eight channels of 40 watts RMS while sculpting the sound with powerful tuning software using your Windows PC.

Connecting to the whole system

The DSP4086 was designed to take the signals from your vehicle's front speakers, rear speakers, front center channel, and rear subwoofer. You can then process those signals to create eight powered outputs, and you have the ability to power and control your front tweeters.


Every channel features 31-band EQ, switchable from parametric to graphic; completely variable high-, low-, and band-pass filters with selectable slopes; time delay, up to 12ms in 0.2ms increments; and 0/180° phase adjustment. You can assign each input to an output, and you can sum signals in order to create a full-range signal to be processed.


DSP4086 connection panel


Product highlights:

  • 8-channel car amplifier with digital signal processing
    • 40 watts RMS x 8 at 4 ohms
    • 60 watts RMS x 8 at 2 ohms
  • DSP and EQ tuning tool adjustments made via USB connection to a Windows PC
    • save up to 10 presets
  • inputs: 6 assignable preamp and speaker-level (RCA adapters included)
  • outputs: 8 powered and processed
Adjustment Details:
  • 31-band EQ (selectable parametric or graphic)
  • adjustable high-, low-, and band-pass filters (20-20,000 Hz)
    • selectable filter slopes 6, 12, 18, 24, 30, 36, 42, 48 dB/octave)
  • adjustable delay: 0 to 12ms in 0.2ms increments
  • phase adjustment: 0 or 180°
  • programming done by a Windows-run PC
Other Features:
  • includes wired remote for ch 7/8
  • fuse rating: 40A x 1
  • wiring and hardware not included with amplifier
    • 8-gauge power and ground leads recommended
  • dimensions: 5-11/16"W x 2"H x 9-3/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # DSP4086AM

What's in the box:

  • 8-Channel DSP amplifier w/ attached 6" 6-RCA input harness
  • Remote bass level control
  • 16.5' Remote level control cable (RJ-12 connectors both ends)
  • 8" Power/ground/Rem harness (inline 40A ATO fuse)
  • 8" 16-Pin speaker output harness
  • 70" USB Cable (type-A both ends / 2.0)
  • 6 Input adapters (RCA to set-screw)
  • Spare 40A ATO fuse
  • Four 15mm screws
  • Two 10mm screws
  • 4 Large flat-washers
  • 4 Small flat-washers
  • 4 Lock-washers
  • Four 6-1/2" wire ties
  • Owner's manual (Eng/Span/Fren/Others)

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Product Research


Overview: The JBL DSP4086 audio processor/amplifier lets you fine-tune your vehicle's audio system, with an easy-to-use interface and a plethora of tuning capabilities. If features 6 input channels, accepting high- or low-level signals, that can be summed and assigned to any of the processor's 8 powered output channels. Each channel can have its own 31-band parametric or graphic EQ, high- and low-pass crossovers, with selectable slopes, time delay, and more, all configured using you connected Windows PC.

Note: The DSP4086 does not include any wiring. An 8 AWG amp wiring kit is recommended (sold separately).

Amplifier: The DSP4086 features an ultra-efficient class-D amplifier that can provide 40W RMS @ 4Ω to each of the eight output channels, and 60W @ 2Ω. Internal conformal-coated PCBs are designed to withstand the harsh conditions of vehicle use and provide consistent power.

Inputs: The DSP4086's built-in input harness features 6 RCA connectors for use with aftermarket radios with pre-amp outputs. If installing the processor with a factory radio, 6 RCA adapters with set-screw inputs let you connect to factory speaker-level signals. The software-based configuration lets you sum together separate tweeter, midrange, and woofer channels to a full-range signal that can be assigned to any of the 8 outputs. Input signals can range from 680mV all the way up to 15V.

Outputs: The JBL processor/amplifier includes 8 powered speaker outputs on a removable 16-pin harness. Each output can provide 40W @4Ω and can be assigned to any of the input channels. Channels 7 & 8 can be assigned as subwoofer outputs, and can have their output level controlled via the included wired remote control.

Note: The DSP4086 does not support bridging output channels.

DSP: Configuration of the DSP software can be done using your Windows PC (MAC not supported) connected to the processor using the included USB cable. The DSP Tuning Software can be found here. Configuration parameters can all be accessed from one main screen, and include the following options:

  • Speaker Locations: Lets you designate the type of speaker and location for each output channel. A handy Speaker Location View lets you see each speakers location in the vehicle and its corresponding amplifier channel.
  • Input Mixer: The audio signal from any input channel can be assigned to any output channel. Multiple input channels can be summed to the same output channel, allowing a full-range speaker to get its signal from separate tweeter, midrange, and woofer signals in a factory system.
  • Linking Channels: Paired channels can be linked, so tone controls can be applied to both channels evenly.
  • Channel Volume & Muting: Each channel can have its signal level adjusted for a balanced output. Individual channels can be muted as well.
  • EQ Setup & Display: Lets you select a channel and apply 31-bands of either graphic or parametric EQ to it. Parametric EQ lets you select the Frequency between 20Hz and 20kHz, adjust the Gain for that frequency (-20dB to +10dB), and set the Q or "width" of the selected frequency. Graphic EQ features 31 pre-selected frequencies with only Gain adjustment. Frequencies include: 20Hz, 25Hz, 31Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.2kHz, 1.6kHz, 2kHz, 2.5kHz, 3.1kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz, 20kHz.
  • Crossover: Each channel can have a high- or low-pass filter applied to it, or both for a band-pass filter. Cutoff frequencies can be selected from between 20Hz to 20kHz, with a selectable slope from Off, 6-, 12-, 18-, 24-, 30-, 36-, 42-, or 48-dB per octave.
  • Time Delay: Lets you delay the output signal in 0.2ms increments, for the selected channel, allowing all audio signals to arrive at your desired focal point at the same time.
  • 0˚/180˚ Phase: The phase of each channel can be reversed to correct any inadvertent phase cancellation caused by vehicle acoustics.
  • Clipping Indicators: Each channel features a clip indicator that will light if 10% or higher distortion is present. Input signals should be lowered until the indicator goes out.
  • Write/Delete: Up to 10 DSP configurations can be stored and recalled via one of the 10 designated "buttons". Pressing the Write button and then a Preset button will save to that memory location. Pressing any Preset button will recall that Preset, and pressing Delete and a Preset button will delete that memory location.
  • File Save: System configuration files can be saved to a folder on your computer for recall at a later time.
  • Settings: Opens a sub-menu with the following options:
    • Language: English, Spanish, French, Chinese, and Japanese.
    • Power Delay: Lets you delay the processor turn-on, if vehicle requires.
    • Firmware: Used for upgrading firmware and resetting unit to factory settings.
  • Reset EQ: Lets you reset the type of speaker and location in vehicle, for each output channel.

Input Level: A 3-way switch on the DSP4086's control panel lets you set the type of input signal: Lo, for pre-amp level signals; Hi and Hi2 are used for speaker-level signals, depending on the speaker signal strength.

Turn-On Mode: This 3-way switch determines how the processor/amplifier will get powered on:

  • REM: If pre-amp connections are used, the REM-In wire (blue) on the 8-pin harness will need to be connected to the radio's remote output. A REM-Out is also provided for activating additional equipment.
  • DC: This mode activates the unit when it senses the ignition has been turned on.
  • Audio: Activates the processor/amp when it detects an audio signal on the inputs.

Remote Bass Level Control: A wired Remote Bass Level Control is included for adjusting the output level from channels 7 and 8 when assigned as subwoofer channels. The compact control offers level adjustment from -30dB to +6dB and can be mounted under a dash or console, using the provided screws. The level control connects to the processor/amp via a 16.5' cable with RJ-12 connectors.

  • Level Control Dimensions: W=2.0", H=1.0", D=2.0" incl. knob (2.75" w/ cable)

Protection Circuit: A red LED on the DSP4086 will light if a problem is detected, including: Short-circuit on a speaker output, over or under voltage, excessive heat, or amp output circuit failure.

Power & Ground Wiring: The DSP4086 includes a removable 8" wiring harness, providing the Power, Ground, Remote In, and Remote Out wire connections.

USB: A USB port (type-A/2.0) is provided on the processor/amp for connecting a Windows PC for configuration.

Note: Audio playback is not supported by the USB port.

Mounting: The DSP4086 features built-in mounting tabs with 4 key-hole slots for attaching the amp to a flat surface. Mounting hardware is provided.


  • RMS Power Output:
    • 4Ω: 40W x 8
    • 2Ω: 60W x 8
  • Amplifier Class: D
  • Operating Voltage: 8V - 16V
  • Frequency Response: 10Hz - 22kHz (-3dB)
  • Signal-to-Noise Ratio: 90dB
  • Signal-to-Noise Ratio (CEA-2006): 75dB
  • THD+N @ 4Ω: <1%
  • Input Sensitivity:
    • Low Level: 680mV - 6V
    • High Level: 1.6V - 15V
  • Fuse Rating: 40A (ATO)
  • Recommended Power & Ground Wire: 8 AWG (not included)
  • Dimensions: W=5.66", H=1.95", Depth=9.35"/10.35" (incl. wiring)
  • Weight: 2.2 lbs.

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Customer Q&A

18 questions already asked

I don't see a microphone with this like the Kicker Key. How do I know how to fine tune each of the sound settings with my laptop or do I guess with this and never get as close as the Key?
[ Tyler  Jul 21, 2022 ]
1 answer
That's correct Tyler, no mic here. This JBL amp is much more robust than the KEY, especially as far as the DSP setup. I don't recommend guessing with DSP, so if you are dipping your toes in the water we can certainly get you with a Tech Support specialist that can help you set this amp up if you go this route. We provide that lifetime tech with ANY order, especially units like this! If you ARE the type that enjoys "going down the rabbit hole" and tweaking your setup to maximize performance, then manually adjusted DSP amps like this are for you! IF you prefer something that is essentially "set it and forget it" with your radio setup the Kicker Key is the Jam. Now I will point out that this JBL DSP4086 that I've also linked below for convenience DOES essentially do the same thing to the speaker level inputs as the Key. The KEY uses the Mic and CD, the JBL just senses the signal from the radio and summs it that way. BOTH are stellar options if you want better sound, that's for sure Tyler!
[ T  Jul 22, 2022 ]  Staff
could you use outputs 7/8 of this amp to feed the input of the bass pro nano?
[ Oscar  Jun 05, 2022 ]
1 answer
It can be used to send audio to the JBL BassPro Nano. Its power output may be too great for the inputs and we recommend using a LOC in between them. The AudioControl LC1i is great for this task:
[ Paul  Jun 05, 2022 ]  Staff
Looking for help. Bought this amplifier a year ago looking to install it soon. I have a 2017 lacrosse non Bose but it has a factory amplifier. Do I install this amplifier on the output of the factory amplifier?
[ Davon  Apr 05, 2022 ]
3 answers
Yes, you can do this if you want by connecting the factory amplifier speaker output wires to the speaker-level inputs on the JBL amplifier. That is what I did on my car. Just be sure to use the speaker wires for both woofers and tweeters if the factory amplifier has separate channels for woofers and tweeters in order to capture the full frequency spectrum. If your car has a factory subwoofer that you wish to continue to use, I also recommend running that channel through the JBL amplifier so that you can control sub volume using the included volume control knob.
[ EVAN P  Apr 13, 2022 ]
This unit supports high-level inputs as well as low-level inputs. You will need to set the amp's switches to the required settings - Turn-On mode to DC or Audio and Input Level to HI.
[ Danny  Apr 06, 2022 ]
[ Daniel  Apr 05, 2022 ]
I have a 2017 Buick LaCrosse that's non Bose But there is a factory amplifier how would I go about installing this dsp amplifier. Should I use the output wires to the input side of the amplifier the. Wire the speakers to the output wires coming out of the amplifier?
[ Davon  Apr 05, 2022 ]
1 answer
You might be better off finding a forum for your car, the JBL amp can take high level inputs but if the factory system has low level inputs going to the amp I would use those instead. On my Civic, there is a single proprietary digital out from the head unit into an amp, so I don't have the option. The JBL works fine taking the signal out of my factory amp, but the Honda amp has some signal processing baked into it that I don't like and can't turn off. Low level inputs would definitely be better.
[ Nick  Apr 05, 2022 ]
Can you assign an input to more than one output? For example, could a full-range input channel be assigned to two separate outputs (one for woofer, one for tweeter)?
[ Ronald  Feb 17, 2022 ]
4 answers
I purchased this amp but never installed.
[ JEFFREY  Feb 18, 2022 ]
Well it depends how you wire it. The amp will save whatever settings you place in it but the sound will depend on how you set it up and configure it. I used my amp for voice only and a separate one for bass. My bass amp is so small but wow what a punch. It's from clarion and crutchfield sells it.
[ ADRIAN  Feb 17, 2022 ]
Yes, you can assign a single input to as many outputs as you want. You can also mix them so say assign two inputs to one output, and set the mix like 75% of input 1 and 25 of input 2. I found this helpful and setting up the center channel front speaker. I took the left and right inputs and mix them 50% each to send that to the center.
[ CASEY  Feb 17, 2022 ]
Yes. Any input can be assigned to any output regardless of if it's been assigned to another output already. Multiple inputs can be assigned to a single output as well.
[ Todd  Feb 17, 2022 ]
can you leave the USB wire hooked up to the amp in order to do future fine-tuning?
[ Mike.  Jan 22, 2022 ]
2 answers
I have had the USB cable plugged in since install, and it doesn't recognize anything until I plug the other end into a computer. No problems.
[ Nick  Jan 22, 2022 ]
Yes you can. I leave mine connected
[ James  Jan 22, 2022 ]
How do I set up the DSP for bridged channels 7 and 8 for one subwoofer? How do I set up the INPUT MIXER for this subwoofer? I am only using the left and right signals from the head unit as input signals for the amp.
[ Jayce  Oct 07, 2021 ]
4 answers
the amp will not bridge any channels. 7 and 8 are automatically set to sub but can be changed. you can do a dual voice coil sub and run one channel to each voice coil.
[ CASEY  Oct 07, 2021 ]
I don't think this amp supports channel bridging for the subwoofer. The user manual says it does not support bridged outputs. Using just L/R from head unit as a single input will be OK, you just set up the DSP to use that channel as the sole input source.
[ BRYAN  Oct 07, 2021 ]
I haven't attempted to bridge the output channels but you would have to use the RCA connectors that came with it and connect the negatives together and same with the positives and then run those wires to the sub. And as far as tuning the input mixer im not 100 percent sure I had a buddy of mine tune it but he had to go into each channel and manually tune it.
[ CONNOR  Oct 07, 2021 ]
You cannot bridge any channels for this amp. If you are using only the left and right signals from the headunit, you'll have to make sure that all channels that you are driving is setup to get the correct signal in the input mixer. In the Input Mixer menu, the left side represents the signal you are sending into the DSP. In your situation, you'll need to make sure you only choose either Channel 1 or 2 from the left side for the signal. The bottom row of the input mixer is your outputs. There is a video you can watch from the five star car audio guys that runs you through the setup process. Its easy.
[ Michael Hong  Oct 07, 2021 ]
Is there a T-harness for a 2021 Jeep renegade to retain the factory audio system, without cutting wires?
[ Al123789  Sep 21, 2021 ]
1 answer
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Calvin  Sep 22, 2021 ]  Staff
I am looking for an ideal location to install the DSP for my BMW F10 2014. I live in Dubai, UAE where the ambient temperature can easily reach 50C during peak summers when the car is parked. Would this cause overheating issues with the DSP and cause it to shut down if I place it in the trunk?
[ Basil  Sep 08, 2021 ]
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. 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.
[ Krissy  Sep 10, 2021 ]  Staff
If I use this amp with a LOC, how does the signal get to my speakers? I understand the signal goes from my head unit and stock amp to the LOC, which can then interface with this additional aftermarket amp via RCA cables, but I don't understand what happens to the signal after that. Do the speakers need to be wired directly to this new aftermarket amp? If so, doesn't that defeat the purpose of the LOC? Thanks!
[ Oshin  Aug 05, 2021 ]
4 answers
You can wire the new JBL amp directly from your stock amp to the JBL amp and then to your speakers. I hope that answers your question.
[ CHAD  Aug 05, 2021 ]
Yea ur right , you do not need a LOC with this amp, you need to wire the amp directly to your factory speaker wires at the output and input from your factory amp
[ CONNOR  Aug 05, 2021 ]
No need for a LOC unless you are feeding a separate sub amp with it. The RCA inputs on this amp includes speaker level adapter that can be used. Head unit > Stock amp (only if the head unit doesn't have RCA outs or speaker level outs) > DSP > LOC (only to feed a sub amp. Channels 7&8 can be turned into a sub channel)
[ Todd  Aug 05, 2021 ]
You don't need a LOC with this amp/dsp. It is able to take high level inputs. You'll need to adjust the settings of the DSP through the JBL tuning app on your computer to set the level so it doesn't clip the signal. The speakers will connect directly to this amp using the provided harness. You can also turn down level of the amp output to use as low level outputs for an amp that has more power, likely for a subwoofer.
[ Michael Hong  Aug 05, 2021 ]
Is there any way I can send a digital signal from my iPhone directly into the amplifier?
[ Will  Jul 15, 2021 ]
2 answers
I don't own a iphone I can operate through my reciver and I know you can hook up a laptop to the amplifier.
[ JOSEPH  Jul 16, 2021 ]
No, not that I'm aware of.
[ Julian  Jul 15, 2021 ]
Does this DSP Amp have the ability to sum input signals?
[ Andrew  Jun 07, 2021 ]
1 answer
Yes, but only when hooked to a computer. Each output channel can have combined signals from multiple input channels, though I haven't combined more than two inputs to one output.
[ Nick  Jun 08, 2021 ]
If u have a external eq can u turn the amps eq off?
[ Craig  Mar 08, 2021 ]
5 answers
Yes! The amplifier ships with a neutral EQ that is customized or changed only when you want via a a laptop and the JBL software (the amp is like the George Forman grill: you set it and forget it). The killer part of this setup is that the JBL team included a subwoofer volume know that makes this the perfect addition to virtually any system.
[ Robert  Jul 17, 2021 ]
I still have not installed mine yet. So I unfortunately am of no help
[ SCOTT  Mar 09, 2021 ]
I haven't tried but I believe you don't have to use the EQ. The EQ on this amp is far better than the built-in one on my head unit.
[ Ernest  Mar 08, 2021 ]
yes you could set everything flat. But you have the amps 8ch tuning for hi mid low and subs. Thats when this amp comes alive.
[ JEFFREY  Mar 08, 2021 ]
Yes, you could just leave it flat at default settings. This will still allow you to pick which input channel will feed which output channel. Also will allow you to choose the distance between you and each channel so that you can tune each to all hit you at the same time(driver seat). And you will still be able to filter each channels hertz. The only thing is you will need to make any changes from your laptop. So its not easily changed. .
[ James  Mar 08, 2021 ]
I need six outputs for front and rear speakers, is it possible to use bridge the last two channels for a sub?
[ Nick  Jan 27, 2021 ]
5 answers
None of the channels can be bridged. The information is in the owners manual that you can download here or on JBL's website where this clearly explained.
[ ABThonas  Jul 17, 2022 ]
As far as I know you can bridge any of them but the last 2 Channels on this sub are setup for subs. You don't have to use them for subs but JBL kind of expected people to do this.
[ Ernest  Jan 27, 2021 ]
No you can't bridge channels. But you can link 7/8 to another amplifier for a sub.
[ COREY  Jan 27, 2021 ]
Channel 7 or 8 can be used with base boost knob. But no bridging
[ TIM  Jan 27, 2021 ]
No bridging
[ TIM  Jan 27, 2021 ]
[ ENOCH  Jan 07, 2021 ]
4 answers
Yes you can mute any of the eight channels via the PC software. It can be used as a line driver and dsp for other amps.
[ ABThonas  Jul 17, 2022 ]
You can use 7 or 8 after dsp but only as a speaker level input to another amp
[ TIM  Jan 27, 2021 ]
I have yet to get mine installed so I can't answer that yet
[ SCOTT  Jan 07, 2021 ]
No it only sends out an amplified signal.
[ Brian  Jan 07, 2021 ]
Is this a plug and play with 2008 acura tsx with navigation or does it need additional adapters?
[ Vince  Dec 17, 2020 ]
2 answers
Educated guess. I believe the TSX has (2) tweeters, (4) 6.5 mid bass in each door & (2) 6x9 speakers in the rear deck. That would use six channels of the amp with two channels leftover to run two single voice coil subs, one dual voice coil sub or two dual voice coil subs wired two ohm stereo.
[ ABThonas  Jul 17, 2022 ]
It's not plug and play even with adapters. You still need power run from the battery and you need to tap into the output of your factory amp. There might be adapters that help but none that make this plug and play
[ James  Dec 29, 2020 ]
Does this amp need to be wired directly to the battery?
[ Dwight  Dec 01, 2020 ]
1 answer
This amp does need to be wired directly to the battery. We list the compatible amp wiring kits on the Accessories tab!
[ Paul  Dec 14, 2020 ]  Staff

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