High-performance Clari-Fi™ Enhanced 4-channel full-range car audio power amplifier

£379.99379.99 each
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GTR Stadium Amplifiers

Amplifiers with a small footprint and big impact. GTR mono and full-range, multi-channel amplifiers deliver the efficiency and power you expect from Class D amps—and the performance you expect from JBL. Each model in the lineup will accept both high-level or low-level inputs, allowing the JBL Stadium amplifiers to be added to virtually any car audio system, including factory installed systems. The 2-, 4- and 5-channel amplifiers offer Bluetooth® audio streaming, exclusive Clari-Fi™ music restoration technology that analyzes and improves the audio quality of compressed files in real time, a multi-pairing Party Mode that lets anyone in the car stream music, and a cabin-mounted control panel. GTR amplifiers give you the power to shape your car audio experience in new ways.

Item# GTR-104

General Specifications

Peak Power 1500W

Audio Specifications

2-Ohm Power Output 120Wrms x 4, <0.1% THD+N
Signal-to-Noise Ratio >75dB (ref 1 W output @ 4 )
4-Ohm Power Output 100Wrms x 4, <0.1% THD+N
Click here for a complete list of all specs for this product

Spec Sheet (EN)

2 MB

Spec Sheet (EN)

997 KB
  • 1 amplifier
  • 1 cabin-mounted control panel
  • 2 spare fuses
  • Owner’s manual

Search Result For ""

What speakers (two 6x9 and two 6.5in) would you recommend to be used with this amp?

Asked by: rando1
I highly recommend the GTO series speakers. I have them installed in my car and they sound way above their output grade compared to other speakers I have installed in the past. My speakers are the same size as yours.
Answered by: ShatteredMJ
Date published: 2017-11-01

Hi Is it possible to use bluetooth alone to play music out to the speakers, without connecting to the car main unit ? Can a SUB amplifier be connected directly from this if you only play music via bluetooth?

Asked by: Ricardo26
Yes, you can work with this amplifier thru BT even without a direct connection to the car main unit. The amplifier is also has a PRE OUT connection for a secondary amplifier.
Answered by: Mel at Customer Service
Date published: 2017-06-12

Hi. Recently got GTR104 and connected a JBL 3 way power series speakers with a gauge 8 power cable. The HU is a Sony 712BT. Question is Why is the amp auto shutting off when HU is in low volume like 12 below? Need to power it on on the remote again.

Asked by: Poringdrops
Turn the input on the amp down, considerably, and turn up the volume of the head unit, to compensate, and the unit will stay on, and sound better as the signal to noise ratio will be much better.
Answered by: Mark at Customer Service
Date published: 2017-07-14

Will this amplifier work any better with an iPhone X (bluetooth 5.0)than an iPhone 5s.

Asked by: Johnny Bluetoooth
You might find the answer to your question in our Product Support FAQ and knowledge base sections. The link is located at the top of this page. If this does not answer your question,Please submit a case request at https://www.jbl.com/support-contact.html and the Customer Service Team will be more than happy to assist you.
Answered by: Ren at Customer Service
Date published: 2017-09-22

What are the dimenisions of the GTR-104 amplifier? I can't seem to find this info on any manual and I need to know if this will fit under the driver's seat.

Asked by: ShatteredMJ
&nbsp;The GTR-104 has a&nbsp;dimension&nbsp;of&nbsp;265.3 x 179.6 x 54.2mm.
Answered by: Joe G at Customer Service
Date published: 2017-08-02

How does this work with an existing aftermarket head unit since it requires it's own control? Does the control unit it includes have FM capabilities?

Asked by: Bmann
This will work well with existing aftermarket head-units since this will not take over the function of a head unit and will only act as a controller for the amplifier. The GTR-104's controller does not have tuner capabilities and only can accept sources via Bluetooth.
Answered by: Ren at Customer Service
Date published: 2016-12-27

Hi I'm looking to install this bluetooth amp with 2 front speaker and 2 rear speakers into my classic car and was wondering what speakers you would recommend for the best sound? Also, what size is the dash mounted control unit?

Asked by: SimonC
Hi Simon, We can't recommend speakers, this is something you will have to find out with the information from the manual of the amplifier: GTR-104 100W x 4, &le;0.1% THD+N @4ohm 120W x 4, &le;0.1% THD+N @2ohm Above shows the output power for the amplifier, and you should choose your speakers so they will match this power ( especially the resistance of the speakers ) The size of the dash mounted controls, this is 110mm x 48mm on the front. If you need to cut out room to fit it somewhere, the cutout needs to be 93mm x 34mm If you require further information, please contact us on customer.support@harman.com
Answered by: Kay Harman
Date published: 2017-06-05

I'm panning to connect the jbl BASSpro sl to the pre-out of the amp. If the amp is connected to the speaker-level line of the head-unit would the pre-out give a speaker-level or a line level signal?

Asked by: lexmarkpol
The speaker level input on our amps are designed for head units that do not have RCA line-out. For you to be able to use a powered subwoofer when connected via speaker level input. Switch the GTR-104's input control to HI1 and adjust the crossover to HPF.
Answered by: Miko at Customer Service
Date published: 2017-07-03
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