JBL Marine MA704
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JBL Marine MA704 Compact size - Image

Compact size

JBL Marine amplifiers feature a slim chassis and a small footprint to allow for installation in tight spaces

JBL Marine MA704 High- and low-level inputs - Image

High- and low-level inputs

Speaker-level and low-level inputs let JBL Marine amps integrate with just about any audio input.

JBL Marine MA704 Selectable Output and Variable Adjustment Crossovers - Image

Selectable Output and Variable Adjustment Crossovers

JBL Marine amps feature selectable all-, high-, or low-pass crossovers with variable electronic frequency adjustment to allow for fine-tuning multiple system configurations.


JBL Marine MA704 Product Value - Image

Product Value

JBL power and performance at an affordable price point

JBL Marine MA704 Cosmetic Appeal - Image

Cosmetic Appeal

Product family look and feel to meet the needs of our JBL customers

JBL Marine MA704 Conformal-Coated PCB - Image

Conformal-Coated PCB

JBL Marine amplifiers are engineered to withstand harsh marine conditions, with fully “marinized” circuit boards to ensure flawless power delivery, year after year

JBL Marine MA704 Variable Crossovers - Image

Variable Crossovers

Onboard 12dB electronic crossovers, with selectable full-range, high-pass & low-pass switching, provide tuning options for systems of any size

JBL Marine MA704 Big Dynamic Power - Image

Big Dynamic Power

Output power is perfectly matched to meet the needs for your JBL marine products

Specs & Downloads

Item# MA704


Weather-resistant & high-performance marine amplifiers

New weather-resistant & high-performance JBL Marine amplifiers deliver impressive power from a compact chassis designed to withstand outdoor environments. Available with 4-channel and 5-channel outputs. JBL Marine amplifiers incorporate our latest amplifier topology that includes selectable all-, high-, or low-pass crossovers with variable electronic frequency adjustment for precision system tuning. Engineered for harsh marine conditions, with power and performance to meet the needs of any outdoor audio system, JBL Marine amplifiers are the perfect match for all of your JBL marine products.

General Specifications

Max Power
1000W Peak
RMS Power Output @ 2Ω
100W x 4, <1% THD+N
RMS Power Output @ 4Ω
70W x 4, <1% THD+N
RMS Power Output, 4Ω Bridged
200W x 2, <1% THD+N
Signal-to-Noise Ratio
>85dB (ref 1W output @ 4Ω)

Documents & Downloads

Reviews and Q&A

Customer Reviews

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Product Q&A

I really like JBL products have numerous (Boombox is awesome). Bought this amp about 2-3 months ago and it overheats everytime when at lake..only pushing two 6.5&quot; Wetsound tower speakers. Why is it doing this repeatedly?

Asked by: PaulH201912345
Hi Paul, thanks for reaching out. You could check for your wires and look for shorts and damage on it's insulation. Speaker impedance also plays a factor, if the speakers that you have is 2 ohms or lower, it would be normal to have the amp heat up on high volumes. For troubleshooting, please contact us here:&nbsp;https://support.jbl.com/us/en/customer-service/contact.html
Answered by: Jem at Customer Support
Date published: 2021-06-06

I would like to power a set of 4 JBL stadium 6.5&rdquo; speakers(listed at 3 ohms). Will this be a problem since I&rsquo;m not running 4 ohms? From another question and answer listed here I&rsquo;m wondering if this amp is only capable of handling 4 ohms.

Asked by: Sbakes
Our JBL Marine MA704 can handle down to 2 ohms. But if you're going to wire it on bridge mode, it can only go down to 4 ohms.
Answered by: Jem at Customer Support
Date published: 2021-06-06

I would like to use this amp on a sailboat. Because there will be times when I wish to coserve the battery is there a way to remotely switch the amp on and off? Also is there a way I can remotely increase and decrease the amp output?

Asked by: JD Sail
Regrettably, it doesn't have remote control and doesn't support 3rd party ones since it doesn't have built-in infrared or Bluetooth receivers.
Answered by: Homer DLR
Date published: 2021-06-06

Is the MA704 a Class D or Class A/B amp?

Asked by: Wyzer
Our JBL Marine MA704 is Class H amplifier, similar as Class AB amplifier, the difference is multi-group power supply (+VCC1/-VCC1, +VCC2/-VCC2, +VCC3/-VCC3) switching follow with input signal in order to improve efficiency.
Answered by: Jem at Customer Support
Date published: 2021-07-09

I am running 4 61/2s and a 10&rdquo; inch sub in my boat. I have this amp but my receiver only has two sets of pre outs. &nbsp;Does the amp have the capability to adapt to that?

Asked by: jshark1999
We'd like to work with you directly so we can gather more information for your Audio setup. Please contact our customer service at https://support.jbl.com/us/en/
Answered by: Customer Support
Date published: 2021-12-19
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