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690 Watts Class D Mono Amp with Bluetooth App Control – JA1B


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  • Jensen AMP App (Apple®/Android™)
  • RGB Custom Color Illumination
  • Class D Design
  • High Level (Speaker Wire) Input
  • Low Level (RCA) Inputs
  • Dimensions: 2.16″ X 9.56″ X 5.59″ (HXWXD)
  • Adjustable Bass Boost At 45 HZ
  • CTA-2006-D Certified

*Upgrade to 5-year Warranty by Registering Your Professionally Installed Item.

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SKU: JA1B Category:

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Jensen Amp Series
The new Jensen JA series amplifiers leverage 90+ years of audio excellence combined with modern smartphone technology to deliver the high-quality sound you require with the convenience and usability you seek.

control amp from your smart phone

App Control

Easy Access

Say goodbye to crawling in the trunk to adjust your amp. The new amp app allows you to dial in your amp’s settings from a smartphone anywhere or near the car. You don’t listen to music in the trunk, why tune your audio from back there?

Adjustment Options

Adjustment options are perfect for the seasoned audiophile and those new to the hobby. Take advantage of the built in EQ presets for great sound right out of the box or try your hand at custom tuning with detailed frequency, volume, and gain controls.

More than audio

In addition to customizing the audio options, the app also lets you choose RGB illumination options. Match the amp colors to your car interior or change colors on the fly to match your mood. The easy-to-see color wheel makes it simple to choose the prefect shade.

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Built Without Compromise Small Size, Big Sound The Class-D amplifier design provides nearly double the efficiency of analog class AB amplifiers in a much smaller footprint. This lets you install them in very small spaces and to leaves trunk space for that road trip cooler or suitcase.

Dimensions: JA1B : 2.16″ h x 9.56″ w x 5.59″ d

Intuitive Side Panel Design

Clear labels make it easy to understand all side panel inputs, outputs, and connections for a faster installation.

ja1b amplifier side b
specialized amp technology

Micro Circuitry

Modern micro circuitry enables the amplifiers to provide powerful sound in a super-small footprint.

Real Power, Trusted

The Jensen JA amplifiers are the first amps on the market to have third-party tested and approval to meet the updated CTA-2006-D specifications.

cta 12v amplified power

Speaker Outputs



D Digital

Speaker Inputs

High level (Speaker Wire), Low Level (RCA)



App Control



Adjustable low-pass crossover (32 Hz – 300 Hz)

Frequency Response

20 Hz – 300 Hz

Signal to Noise Ratio

68 dBA

Total Dynamic Power

690 Watts


RCA Pass Through

Gain Adjustment

Variable 200 mV ~ 6 V

Adjustable Bass Boost

45 Hz

Power Supply


Fuse Size and Type

25A x 2


2.16″ X 9.56″ X 5.59″ (HXWXD)


CLASS D EFFICIENT DESIGN – produces 325 Watts of maximum dynamic power at 50Hz x 1 channel @ 4 ohms , 565 Watts of maximum dynamic power at 50Hz x 1 channel @ 2 ohms and 690 Watts of maximum dynamic power x 1 channel at 50Hz @ 1 ohm

RGB ILLUMINATION VIA BLUETOOTH APP – the Jensen app allows you to have full control over your amplifiers various functions such as: Illumination, Remote Bass, Frequency, Volume & Gain

LOW-PASS CROSSOVER & BASS BOOST – When constructing the Jensen mono amplifier, we added a low-pass variable crossover for versatility and a variable bass boost at 45Hz

SHORT CIRCUIT PROTECTION – given the vast amounts of dynamic power in your mono amplifier we built-in a thermal DC offset safety protection



  • Jensen Amp app (Apple®/Android™) to control illumination and system set-up via Bluetooth®
    (Free App required for system set-up)
  • RGB Custom color illumination via Bluetooth app control
  • Class D design
  • Amplifier dimensions: 2.16″ x 9.56″ x 5.59″ (HxWxD)
  • Inputs / Outputs:
    • High level (speaker wire)
    • Low level (RCA)
    • RCA Pass-thru outputs

Continuous Power Output :

  • 290W RMS x 1 Channel at 4 ohm
  • 470W RMS x 2 Channel at 2 ohm
  • 595W RMS x 1 Channel a 1 ohm (50Hz and 1% THD+N)

Dynamic Power :

  • 300W x 1 Channel at 50Hz at 4 ohm
  • 545W x 1 Channel at 50Hz at 2 ohm
  • 640W x 1 Channel at 50Hz at 1 ohm (1% THD+N)

Maximum Dynamic Power :

  • 325W x 1 Channel at 50Hz at 4 ohm
  • 565W x 1 Channel at 50Hz at 2 ohm
  • 690W x 1 Channel at 50Hz at 1 ohm (10% THD+N)


    • Frequency response: 20 Hz ~ 300 Hz
    • Signal to noise ratio 68 dBA
    • Adjustable bass boost at 45 Hz
    • Gain adjustment: 200 mV ~ 6 V
    • Adjustable low-pass x-over: 32 Hz – 320 Hz
    • Power/Ground terminals connector: 4 – 8 AWG
    • Speaker terminal connector: 12 – 16 AWG
    • Fuse size: 25 A x 2


Manuals & More


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