Jensen JA4B Class D Compact 4-Channel Car Amplifier

Jensen JA4B Compact 4-Channel Class D Car Amplifier with Bluetooth App Control

The Jensen JA4B proves that big sound doesn’t need a big footprint. This 4-channel amplifier delivers up to 230W RMS of clean, consistent power and peaks at 365W of dynamic output when bridged—providing the clarity and impact your car audio system deserves. Thanks to its efficient Class D design, it runs cooler and cleaner while fitting neatly in tight spaces.

App Control That Puts You in Charge

Forget fumbling in the trunk to tweak your amp. With the Jensen AMP App for Apple and Android, you can fine-tune your sound directly from your smartphone. Adjust crossover points, gain, bass boost, and EQ settings without leaving your seat. The app’s built-in EQ presets make setup simple for beginners, while advanced users can dive into precise custom tuning for a truly personal sound experience.

Customizable RGB Illumination

Sound isn’t the only thing that shines. The Jensen JA4B features RGB color illumination that you can adjust right from the app. Whether you want to match your dash lighting, your car’s interior, or just your mood, the color wheel makes it easy to find your perfect shade in seconds.

Compact Design, Powerful Performance

With dimensions of just 2.16″ x 8.38″ x 5.59″, the Jensen JA4B is engineered for tight installations without compromising output. Its micro circuitry and PWM MOSFET power supply work together to deliver clean, distortion-free sound with remarkable efficiency. The amp’s CTA-2006-D certification also ensures that every watt of power is measured and verified for real-world accuracy.

Precision Sound Tuning

The JA4B includes adjustable high-pass and low-pass crossovers (32–320Hz) and a variable bass boost at 45Hz to help shape your ideal sound. Whether you’re powering full-range speakers or a subwoofer setup, this amp adapts easily. A variable gain adjustment (200 mV–6V) and RCA pass-through outputs give you more flexibility for system expansion.

Engineered for Reliability

The Jensen JA4B doesn’t just perform—it protects. Built-in short circuit and thermal protection safeguard your system even under heavy load. With 4 to 8 AWG power/ground terminals and 12 to 16 AWG speaker connections, you get secure, efficient power delivery every time.

More Than Just an Amplifier

The Jensen JA4B represents more than power—it’s the next generation of connected car audio. With smart app control, full-range tuning, and visual customization, it’s the perfect blend of power, precision, and personality in a compact design built for modern drivers.

FAQs

1. What makes the Jensen JA4B different from other amplifiers? The JA4B stands out with its smartphone app control, letting you adjust EQ, gain, crossovers, and even RGB lighting without leaving your seat.
2. Can I control both sound and lighting through the Jensen AMP App? Yes, the app allows full control over your audio settings and RGB illumination colors using a simple on-screen color wheel.
3. How much power does the Jensen JA4B deliver? It produces 90W RMS x 4 channels at 4 ohms, 115W RMS x 4 channels at 2 ohms, and up to 230W RMS x 2 channels when bridged.
4. What size system is this amp best suited for? Its compact Class D design makes it ideal for upgrading factory systems or powering multi-speaker setups where space is limited but high output is needed.
5. Does the amplifier have built-in protection features? Yes, it includes short circuit, DC offset, and thermal protection to keep your system safe during heavy use.