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JBL GTR-104

4-channel car amplifier with Bluetooth® connection — 100 watts RMS x 4

Item # 109GTR104

JBL's GTR-104 4-channel car amplifier can deliver 100 watts RMS per channel to your front and rear speakers —...

JBL's GTR-104 4-channel car amplifier can deliver 100 watts RMS per channel to your front and rear speakers —...

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About the JBL GTR-104

Power delivered in style

JBL's GTR-104 4-channel car amplifier can deliver 100 watts RMS per channel to your front and rear speakers — serious power from a compact chassis that exudes style. Even better, you can stream music directly from a Bluetooth device to this amp, while its built-in processing restores the excitement in your music that data compression removes.

Power delivered in style

JBL's GTR-104 4-channel car amplifier can deliver 100 watts RMS per channel to your front and rear speakers — serious power from a compact chassis that exudes style. Even better, you can stream music directly from a Bluetooth device to this amp, while its built-in processing restores the excitement in your music that data compression removes.

Connectivity

You can stream music from a Bluetooth device directly to this amp for convenient, wireless play that bypasses your car's radio. You can connect the amp's preamp outputs to a subwoofer amp, like the matching JBL GTR-601 or GTR-1001, so your music will have plenty of low-end punch. The Party Mode feature allows up to three different sources to stream, so more people can join in the fun.

Restores the excitement in your music

Downloaded digital music and streaming services apply data compression to their files so you can store more songs on your devices, but compressed music sounds noticeably duller than uncompressed files. Harman's Clari-Fi™ sound restoration technology improves the sound quality of your digital music by analyzing the data and then reconstructing the parts that were removed during the compression process. You get crisper highs, increased dynamics, clearer vocals, and fuller music. The included wired remote gives you handy controls for Bluetooth streaming, hands-free calling, Party Mode, and Clari-Fi signal processing.

Versatile

Need some bass power? You can switch the GTR-104 into bridged mode and drive two subwoofers with 240 watts RMS each. The variable high- or low-pass filter optimizes the amp's output to your speakers, increasing the efficiency of the system. The GTR-104 can accept low- or speaker-level inputs so it'll work in almost any system, and JBL includes RCA-to-speaker wire adapters for your convenience.

JBL GTR-104

JBL GTR-104 control panel

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Product highlights:

  • 4-channel car amplifier
  • 100 watts RMS x 4 at 4 ohms (120 watts RMS x 4 at 2 ohms)
  • 240 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • Clari-Fi™ sound restoration technology improves the sound of your digital music
  • built-in Bluetooth allows you to stream music directly to the amp
  • separate variable high- and low-pass filters (32-320 Hz, 12 dB/octave) on front and rear channels
  • wired remote unit has controls for Bluetooth streaming, hands-free calling, Party Mode, and Clari-Fi signal processing
  • preamp inputs and outputs
  • speaker-level inputs (speaker wire-to-RCA adapters included)
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-7/16"W x 2-3/16"H x 7-1/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GTR-104

What's in the box:

  • 4-Channel amplifier
  • Four 30A ATO fuses (2 installed)
  • Control panel with attached 19.5' cable
  • Control panel flush mount sleeve
  • Control panel mounting bracket
  • 2 M4 x 10mm bracket screws
  • 4 Bare wire-to-RCA adapters
  • Remote plug (Euro or Phoenix connector)
  • 4 Mounting screws (M4 x 52mm)
  • Quick Start Guide

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JBL GTR-104 reviews

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Product Research

Features

Overview: The JBL GTR-104 is part of the GTR Stadium series of high-performance amplifiers. This full range Class D 4-channel amplifier will accept both high-level and low-level inputs. Class D amplifiers are highly efficient and compact, generating lots of power without drawing much current or generating heat. The GTR-104 includes Clari-Fi, an audio restoration feature that improves the sound of compressed digital files. The amp also includes a cabin-mounted control panel to give you amplifier control at your fingertips. The unit comes with spare fuses, speaker wire-to-RCA adapters, and mounting hardware.

Power Output: The GTR-104 delivers the following power output:

  • 100 watts RMS x 4 at 4 ohms (<0.1% THD+N)
  • 120 watts RMS x 4 at 2 ohms (<0.1% THD+N)
  • 240 watts RMS x 2 at 4 ohms bridged (<0.3% THD+N)

Clari-Fi: Clari-Fi is a proprietary technology that analyzes compressed digital music files and improves them in real time. Using a predictive algorithm that restores audio content that is lost during the compression process. Clari-Fi provides extra bandwidth, especially in the high frequencies, widens the sound stage, and gives vocals a natural warmth not found in compressed files.

Control Panel: The amplifier comes with a wired control panel that provides numerous features not typically found with amplifiers. It has Bluetooth technology, and an omni-directional microphone for accepting and ending phone calls from your cell phone. Party Mode lets you pair multiple Bluetooth devices for streaming music from anyone's phone. The control panel also lets you activate the Clari-Fi feature. The panel is 4-7/16"W x 15/16"H, and has a 19.5-foot cable. It can be flush- or surface-mounted with the supplied brackets.

ADAS: The GTR-104 has an interface for the Advanced Driver Assistance System (ADAS) that can override the audio source input to deliver a message or other audio from a connected ADAS accessory. On the amplifier, you can designate which speaker the ADAS signal is output: Front left, front right, rear left, or rear right.

Protection Circuitry: The amplifier features protection circuitry for thermal overload, over- or under-voltage (<9V or >16V), and short circuits. The LED on the top of the amp glows red if the amp goes into protection mode.

Controls: The GTR-104's controls are located on one side of the amplifier. The rotary controls require a small screwdriver (not included) to make adjustments. The amp controls include:

  • Gain: The rotary gain controls let you match the amp's input sensitivity to the output of the source unit. The input sensitivity range of the amplifier is 0.2V and up for a low-level input, and up to 20V for speaker-level input. There are separate gain controls for the front and rear channels.
  • Input Level: The Input Level switch lets you select the type of input you are using. For high-level input, there are two settings: Hi1 and Hi2. If the audio system fails to play with an amplifier connected to its output, or you get a "speaker disconnected" message on your factory stereo, set the switch to the Hi2 position. The Hi2 position includes a circuit design to fool this type of factory system into "seeing" a speaker connected to its output.
  • Crossover: The amp features switchable crossovers that can be set to low pass (LPF), high pass (HPF), or Full Range. You can adjust the cutoff frequency of the crossover from 32Hz to 320Hz using the rotary control. There are separate crossovers for the front and rear channels.

Connections: The JBL GTR-104 uses set screw terminals for the +12V power, ground, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided). The amp connections include:

  • Power/Ground: The +12V Power and Ground terminals will accept up to 4-gauge wire. It is recommended that you use 4 AWG power wire to the battery, with an in-line 60A fuse (or higher) installed no more than 18" from the battery terminal. A 4 AWG ground wire (minimum) is also recommended, and attached to a metal area close to the amplifier.
  • Remote Turn-On: The Remote turn on wire connects to the supplied plastic 2-pin Euro or Phoenix connector. The connector has tiny set screws to tighten the wire, and requires a precision screwdriver (2.4mm or 3/32"). The connector has "IN" and "OUT" terminals, allowing you to daisy chain the turn-on signal to another amplifier, if needed.
  • Speaker Outputs: The amp features screw terminals for connecting four speakers. There are markings on the terminals for bridging the amplifier.
  • Speaker-Level Input: The amp includes four bare wire-to-RCA adapters for connecting the amp to a factory radio or aftermarket head unit without preamp outputs. You should attach each speaker wire from the head unit to an adapter and plug the adapter's RCA plug into the amp.
  • Line-Level Inputs: The amplifier is equipped with two pairs of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp.
  • Pre-Out: A third pair of RCA jacks is provided to output the audio signal to a second amplifier, if desired.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Power and size combined with price [ Cody  Sep 11, 2019 ]
A
Options and great price! [ John  Sep 05, 2019 ]
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four channel good.....2 channel bad [ Scott  Aug 13, 2019 ]
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NOT MANY BLUE TOOTH AMPS OUT THERE !! [ RICHARD  Jun 17, 2019 ]
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Price (50% off) plus it allowed me to get a Bluetooth functionality in my 2004 BMW Roadster without changing my stock athestic [ Ron  Apr 28, 2019 ]
A
Price [ Antonio  Apr 27, 2019 ]
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Had the rms I wanted and the hook ups for my stock stereo [ Karsten  Apr 15, 2019 ]
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I chose this recommended amp to power my new Infinity Kappa component speakers I'll be installing in my 2008 Silverado. [ JEFF  Mar 01, 2019 ]
A
Great reviews seems easy to use [ sergio  Mar 01, 2019 ]
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Bluetooth option sounds great [ William  Feb 21, 2019 ]
A
Reviews look great and Crutchfield makes it so easy to get a trustworthy product. [ Jonathon  Feb 05, 2019 ]
A
I wanted to upgrade the sound in my vehicle without replacing the head unit. This will allow me to bypass that and use the Bluetooth option directly. [ Randall  Dec 26, 2018 ]
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Because crutchfield workers are great and very knowledgeable. [ Jesus  Dec 19, 2018 ]
A
specs and bluetooth fit exactly what I'm wanting for this limited-space build! [ Adam  Dec 11, 2018 ]
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Recommended by Crutchfield associate Alison [ JOHN ERIK  Dec 09, 2018 ]
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Savings [ Dannie  Dec 02, 2018 ]
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big bang for the buck!!!! [ Charlie  Nov 27, 2018 ]
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I chose this product to eliminate an under-dash din head unit in my 64' Nova for a cleaner look and more functionality. [ Jack  Nov 21, 2018 ]
A
I picked this amp because, like He-Man in the 80s, IT HAS THE POWER!!!! Seriously, lots of power and great clarity. [ J  Sep 07, 2018 ]
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Great reviews online! [ Harry  Aug 15, 2018 ]
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A lot of research lol [ Vincent  Aug 13, 2018 ]
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on sale and rms needed [ Patrick  Jul 18, 2018 ]
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matched my other amp [ Jesse  Jun 27, 2018 ]
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Best price, hands down. Good reputation or at least you claim to have, lets see? [ SM-2384-4623 Ma  Jun 19, 2018 ]
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Allison my advisor recommend my speakers and amp for my car , she sounds very knowledgeable about car stereo systems . [ DAVID  May 27, 2018 ]
A
reputable brand; right size [ CRAIG  Apr 29, 2018 ]
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Clean 4 channel power. What else is there? Besides, maybe I can hide the remote. Can't imagine needing it. [ ARTHUR F  Apr 08, 2018 ]
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Bluetooth [ Zach  Mar 25, 2018 ]
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I like the Harmon Kardon "clarifi" capability of this amp, which helps with low-quality digital music, often in streaming format. Other than that the amp quality looks to be good for the price range. [ Ryan  Mar 16, 2018 ]
A
Discounted price on a quality product [ shane  Mar 04, 2018 ]
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It's exactly what I wanted for my car [ Harlan  Feb 21, 2018 ]
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Because it had good reviews and a good price for the watts i needed [ L  Feb 04, 2018 ]
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known brand [ Carlos  Feb 04, 2018 ]
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Sale price [ Marco Eduardo  Jan 29, 2018 ]
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email and sale price [ bruce  Jan 28, 2018 ]
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jbl has been a top quality brand for years, proven quality sound that never seems to fail,good strong balance between bass, mids and highs [ hadley  Jan 06, 2018 ]
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JBL sound quality, power handling and match to speakers purchased [ Lance  Nov 20, 2017 ]
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power, bluetooth and JBL name [ Mike  Oct 03, 2017 ]
A
Honestly, I'm nervous about this product for the fact I plan on going Headunit-less in my major car stereo project. This has to be better than my current head unit (pioneer avh 3700) where bluetooth connectivity does not hold up to my standards. I hope the best for this journey. [ ANTHONY  Sep 03, 2017 ]
A
Chicks dig guys with skills. This amp has skills. [ PIERCE M  Jun 29, 2016 ]
A
Jbl makes solid reliable products. [ James  Jun 21, 2016 ]
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19 questions already asked

Q
Bluetooth Hands-free microphone? I am looking to use this in my '81 Mercedes 300TD, and wish to leave the stock head unit in place. How does this unit handle hand-free (calls)? Is there a microphone included, or can one be purchased?
[ Greg  Sep 28, 2019 ]
1 answer
A
Hi Greg! Thank you for your question. The JBL GTR-104 does have a mic built into the cabin controller, so no external microphone is needed for you to utilize the hands-free phone call features. Any music playing will mute when a call comes in and will stay muted for the duration of the call. Built-in echo cancellation improves call quality by preventing feedback from your car's speakers. Chat with an Advisor online or by phone at 1-800-324-9695, they will happy to assist you with any other questions you may have!
[ Jess  Oct 10, 2019 ]  Staff
Q
If I do not want to use the controller or a head unit, and run everything strictly through the amp via Bluetooth from my phone will that work? Or do I have to have the controller hooked up And just tuck it away? I'm looking at this for a hot rod that the customer doesn't either a head unit or controller.
[ Chris  Sep 15, 2019 ]
1 answer
A
Hi Christian, thank you for your question. In order to utilize the Bluetooth options for streaming audio and hands-free calling, you will need to use the controller that is included with the amplifier. Chat with us online or by phone at 1-800-324-9695, if you would like to discuss this in further detail! Any of our amazing Advisors will be happy to help you out.
[ Jess  Oct 10, 2019 ]  Staff
Q
How can I set the frequency correctly? The range goes from 80-320 hard to judge exactly where I need to be...
[ Joseph  Sep 01, 2019 ]
1 answer
A
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 11, 2019 ]  Staff
Q
Will this work in a 2006 Porsche Boxster , with Bose speakers still? Probably just run the front and the rear sub. Thank you
[ Ed  May 05, 2019 ]
2 answers
A
Yes should work as long as you have a 4 ohm sub.
[ Trifone  May 06, 2019 ]
A
Absolutely
[ paul  May 05, 2019 ]
Q
Does Clari-Fi only work when Bluetooth is directly received through Amp vs stereo?
[ Ben  Dec 30, 2018 ]
3 answers
A
i have on a shelf but haven't used it yet. I plan to next weekend.
[ Jerry  Jan 07, 2019 ]
A
Clari-fi works with ant input, so if you plug the amp into your radio and play a CD or something it is supposed to work on that. Clari-fi will work with Bluetooth, but it probably won't do much since music is already coming from a digital source. Clari-fi is supposed to be used when the input is a old CD or tape or something from your radio.
[ Bobby  Jan 07, 2019 ]
A
It should work when going through bluetooth and through RCA as well
[ Matt  Jan 07, 2019 ]
Q
can I connect a powered subwoofer downstream with the preouts and remote out?
[ Team  Sep 29, 2018 ]
2 answers
A
I don't know. Probably a question for a tech advisor at Crutchfield.
[ DAVID H  Sep 30, 2018 ]
A
Absolutely
[ paul  Sep 29, 2018 ]
Q
Controlling the volume with your phone ..will that let it get loud enough for a motorcycle?? Using phone instead of head unit..thanks Steve
[ Stevo  May 26, 2018 ]
2 answers
A
i am using this amp with no headunit in my car and the volume goes far past my expectations. i run the volume about 5 click from full and its extremely loud with my 100w rms rockford fosgate door speakers. im assuming its up to your speakers at this point. so yes, the amp pushes out what is promised. even while using a phone as the volume controller.
[ Kurt  May 27, 2018 ]
A
Yes, as long as you set the gain right it's really loud
[ Matt  May 26, 2018 ]
Q
Can the amplifier be installed without using the included control panel if I do not care about using Bluetooth?
[ usernameX  May 22, 2018 ]
6 answers
A
Yes you can. It plugs into the amp so you don't have to use it. I am not using the Bluetooth but still have it hooked up and the wire coiled up in the trunk so I can use it for the other features if needed.
[ DOUG  May 24, 2018 ]
A
Yes. The control panel is not needed for it to operate. Just install as you would any amp.
[ ADAM  May 23, 2018 ]
A
Yes, but you may need the panel to turn the Clari-Fi feature on and off.
[ DAVID H  May 23, 2018 ]
A
I don't know because I have not installed my system yet Enter an answer to this question.
[ Lenny  May 23, 2018 ]
A
Yes. I did not install the control head and it works great.
[ Douglas  May 22, 2018 ]
A
You do not need the control panel to run the amp.
[ Bobby  May 22, 2018 ]
Q
How do I control balance, fader, bass, and trebel?
[ Nick  Jan 28, 2018 ]
2 answers
A
There are controls on the amplifier itself for gain, front and rear. There are also controls for the frequency cut off, front and rear. Once you have these set to your liking, everything else is controlled with your Bluetooth device. I used my Android cell phone and the controls are limited, but adequate.I am using this amplifier in a Miata and power the front doors and a small bazooka tube. It works just fine. Take your time adjusting the controls on the amplifier itself, kind of a pain, but worth the time.
[ paul  Feb 03, 2018 ]
A
You ordinarily control those functions with the audio controls built into your automobile's deck. Although you can control the "volume" of the subwoofer with the supplied auxiliary volume control that you can mount in a convenient location.
[ DAVID H  Feb 03, 2018 ]
Q
What Bluetooth codecs does this amp support? Specifically, does it support AAC? AptX?
[ Stuart  Dec 27, 2017 ]
2 answers
A
Both, flawlessly
[ Dallas  Dec 28, 2017 ]
A
Hello. I'm sorry I don't have that answer for you since I'm using everything through my head unit. But it does have an input that says "upgrade" on the amp itself so I'm sure jbl can help with that
[ francisco  Dec 28, 2017 ]
Q
How does using the phone work? Where is the microphone located? Can I connect my ipad and my iphone simultaneously so I can answer calls from iphone but listen to music from ipad?
[ rocktor  Dec 09, 2017 ]
2 answers
A
The microphone is on the control module that connects to the amp. It has, I believe, a 19.5' cable, so you can put it pretty much anywhere. As to how it works.. it works great. Very clear coming through and I don't seem to need to speak up for people to hear me. The only issue I had is a couple days ago, no sound would come through for the call, even though I was connected. I disconnected and reconnected, and it works fine. There is a party mode so up to 3 sources can play music, but when party mode is active, you can't use the bluetooth for calls. My fix (and current setup): aux cord for music and bluetooth connected to my phone. I'm also playing music from my phone, but I like to have a more fine control over the volume - connecting to the amp via bluetooth essentially bypasses your head unit, so you can only control the volume with your input source device.
[ Erik  Dec 11, 2017 ]
A
The microphone is in the little wired remote box.
[ Nathan  Dec 11, 2017 ]
Q
Do I need a head unit for this amp if I just want to connect my phone via Bluetooth?
[ Patrick  Jul 24, 2017 ]
5 answers
A
No head unit is needed, it connects directly to your Bluetooth device. My only complaint is that it takes a minute to boot up and connect
[ Brent  Jul 25, 2017 ]
A
No, you can use your phone with no head unit. Just installed in an old Jeep and it is awesome! Small controller to power it on and connect with Bluetooth. Use your phone to control volume.
[ DAVID N  Jul 25, 2017 ]
A
no, I have this in my 31 Ford and use it with my I-phone
[ Mary56  Jul 25, 2017 ]
A
No head unit needed. Just connect directly to amp.
[ Alexander  Jul 25, 2017 ]
A
I just installed this amp to my 2003 Ford Excursion and you can use it either with or without a head unit. I can Bluetooth from my phone right to the amp an I get great sound just from the amplifier.
[ JAMES  Jul 25, 2017 ]
Q
Do the pre outs work when the amp is direct on Bluetooth? Are they variable?
[ Rob  Jul 14, 2017 ]
1 answer
A
Yes, the RCA pre-amp outputs work for the input audio signal and Bluetooth. They are variable with the input signal level, yes. I hope that helps. My Bio: https://www.crutchfield.com/bio/Ryan
[ Ryan  Jul 19, 2017 ]  Staff
Q
How long is the cable to the control panel?
[ ilaudio  Jun 20, 2017 ]
3 answers
A
The cable is 19.5' long.
[ Erik  Dec 11, 2017 ]
A
I need to correct my previous reply, the cable is about 12 feet long
[ DAVID N  Jul 25, 2017 ]
A
I believe it is 6 feet
[ DAVID N  Jun 21, 2017 ]
Q
Can you tune the amp if you are using the Bluetooth input?
[ Rusty  Apr 02, 2017 ]
2 answers
A
You cannot make adjustments to the amp through Bluetooth, will need to manually do that on the amp itself.
[ DAVID N  Jul 25, 2017 ]
A
You can still adjust the HP and LP filters as well as turn on the Clari-Fi processing while using Bluetooth on the JBL GTR-104. If you would like to discuss further, feel free to contact an Advisor directly by phone (1-800-324-9695) or online chat. Hope that helps!
[ Larry  Apr 07, 2017 ]  Staff
Q
What 6x9 speakers and 6.5 speakers would be recommended for this amp?
[ n  Mar 07, 2017 ]
1 answer
A
This will depend largely on your vehicle. For details on 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 what you will need for an installation as well as make recommendations for speakers.
[ Kenny  Mar 08, 2017 ]  Staff
Q
What are the dimensions of the control panel? And what size opening does it fit into? Thanks!
[ North Guy  Feb 22, 2017 ]
1 answer
A
The faceplate dimensions are 1-7/8" H x 4-7/16" W. The opening size would be 1-1/4" H x 3-5/8" W. I did not get this from the owner's manual. I measured it myself. Also, I did not mount mine as I have it laying in a small slot in the console next to the seat, out of sight. Wasn't interested in cutting a hole in my dash.
[ DAVID H  Feb 26, 2017 ]
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