Features
App DSP Controls
Connections

Features

Overview: Jensen JA Series amplifiers offer ample power in a compact form that can fit in tight vehicle spaces. Featuring Jensen's app controlled DSP, setting up and controlling the amplifer can be quickly and easily done from your Bluetooth connected smartphone.

Power Output: The JA4B Class-D, 4-channel amplifier delivers the following power output:

• CTA Compliant Specifications: RMS power output @ 1% THD+N, 20-20kHz, 14.4 VDC:
  • 90 watts x 4 @ 4 ohms
  • 115 watts x 4 @ 2 ohms
  • 230 watts x 2 bridged stereo @ 4 ohms
• Power Rating: Peak power output @ 10% THD+N, 1kHz:
  • 125 watts x 4 @ 4 ohms
  • 185 watts x 4 @ 2 ohms
  • 365 watts x 2 @ 4 ohms bridged

Protection Circuitry: The amplifier features protection circuitry for short circuits, defective speakers, and below-minimum impedance loads. The LED on the top of the amp will light Red if a fault is detected.

App DSP Controls

App Configured DSP: The Jensen JA4B has no hardware controls or adjustments, with all of the amp settings made through your Bluetooth-connected smartphone using the Jensen DSP Amplifier Controller app, available at the Apple App and Google Play stores. After installing the app, simply pair your compatible smartphone to the amplifier and you'll be able to configure the settings. Options include:

• Master Level: An single Master Level rotary slide-control lets you match the amp's input sensitivity to the output of the source unit, with a range of 200mV to 6V. The Master Level screen also includes:
  • Mute: A Mute control to temporarily mute the sound from all channels.
  • EQ Presets: Four preset EQ settings are available for quick sound adjustment - Classic, Pop, Rock, and Jazz, along with a fifth Custom preset that lets you use the 5-band graphic equalizer to fine-tune your sound.
• Crossover: The DSP app features independent crossovers for the front (Channels 1&2) and rear (Channels 3&4). Each pair of channels can be independently set to LPF, HPF, or Full. The LPF and HPF crossover points can be selected from a variable range between 20Hz and 500Hz. Three slope selections are available: 6dB, 12dB, and 18dB per octave. The Crossover screen also provides a Gain slider for individually raising or lowering each pair of channels, a Mute button for the selected channels, and a Bass Boost control that provides a preset boost at 45Hz.
• Graphic EQ: A 5-band graphic equalizer can be independently applied to Channels 1&2 and 3&4. Preset bands are located at 63Hz, 240Hz, 1000Hz, 3500Hz, and 12000Hz, with a level adjustment of +9 to -9dB. A waveform graph displays the EQ curve while making adjustments.
• RGB Control: The JA4B features an RGB LED backlit logo badge on top of the amplifier. A color-wheel in the DSP app lets you select a static color for illumination, as well as options for Multicolor and Animation.

Connections

Power/Ground: The +12V Power and Ground terminals will accept wire up to 4-gauge, although it is recommended that you use an 8-gauge power wire to the battery, with an in-line fuse installed no more than 18" from the battery terminal. An 8-gauge ground wire (minimum) should be used, and attached to a metal area close to the amplifier.

Remote Turn-On: The Remote set-screw terminal will accept wire up to 12-gauge.

Low-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.

Speaker-Level Inputs: A 11" harness provides the wire connections for speaker-level input signals, if connecting the amp to a factory radio or aftermarket headunit with no pre-amp outputs.

Speaker Outputs: The amp features four positive and four negative set-screw terminals for connecting four speakers in stereo. Each pair of output terminals can be bridged for running high-power speakers or subwoofers. The terminals will accept speaker wire up to 12-gauge.