Jensen 740W Class D 4-Channel Amp with Bluetooth App JA4B
Key features
- Amplifier channels: 4
- RMS per channel at 4 ohms: 90 W
- RMS per channel at 2 ohms: 115 W
- Input gain range: 0.2–6 V
- Crossovers: Adjustable high-pass and low-pass, 32–320 Hz
- App control: Jensen AMP app for Apple and Android
Jensen 740W Class D 4-Channel Amp with Bluetooth App JA4B is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
The Jensen JA4B is a compact Class D 4-channel car amplifier with Bluetooth app control and customizable RGB illumination. It delivers up to 740 watts of total dynamic power, with specified RMS ratings for stereo and bridged operation.
Use the Jensen AMP app on an iOS or Android phone to adjust audio settings and lighting. High-level speaker-wire and low-level RCA inputs support integration with different vehicle audio systems.
Key Features & Benefits
- Class D design: The high-efficiency amplifier delivers up to 740 watts of total dynamic power in a compact footprint.
- Bluetooth app control: Adjust EQ presets, frequency, volume, gain, and RGB lighting from a compatible smartphone.
- Flexible inputs: High-level speaker-wire and low-level RCA inputs offer two connection options for system integration.
- Adjustable crossovers: Set high-pass and low-pass crossovers from 32 Hz to 320 Hz for system tuning.
- Variable bass boost: Adjust bass boost at 45 Hz to tailor the sound.
- System protection: Integrated thermal, DC offset, and short-circuit protection supports safer operation.
Technical Specifications
| Brand | Jensen |
|---|---|
| Model | JA4B |
| Amplifier class | Class D Digital |
| Number of channels | 4 |
| Total dynamic power | 740 Watts |
| RMS power output (4 Ohms) | 90W RMS x 4 |
| RMS power output (2 Ohms) | 115W RMS x 4 |
| RMS power output (4 Ohms bridged) | 230W RMS x 2 |
| Audio inputs | High Level (Speaker Wire), Low Level (RCA) |
| Audio outputs | RCA Pass Through |
| App control | Yes (iOS / Android) |
| Illumination | Customizable RGB |
| Crossover | Adjustable High and Low-Pass (32 Hz – 320 Hz) |
| Bass boost | Adjustable at 45 Hz |
| Frequency response | 20 Hz – 20 kHz |
| Signal to noise ratio | 70 dBA |
| Gain adjustment | Variable 200 mV – 6 V |
| Power supply | PWM MOSFET |
| Fuse rating | 25A x 2 |
| Recommended power/ground wire | 4 – 8 AWG |
| Recommended speaker wire | 12 – 16 AWG |
| Dimensions (H x W x D) | 5.5 cm x 21.3 cm x 14.2 cm |
| Certification | CTA-2006-D Certified |
| Compatibility | Standard 12V automotive electrical systems |
| Warranty | 4-year limited warranty when registered within 60 days of purchase |
Why Choose This Product?
The JA4B combines four amplifier channels, app-based adjustments, and customizable lighting in one compact unit. Its stated RMS ratings show the output at 4 Ohms, 2 Ohms, and bridged 4 Ohms, helping you compare the amplifier with your planned system configuration.
CTA-2006-D certification and the listed output ratings provide defined reference points when evaluating its power. RCA pass-through output also provides a connection point for an audio system with additional components.
Installation & Compatibility Notes
The JA4B is compatible with standard 12V automotive electrical systems. It accepts factory speaker-level outputs through high-level inputs or aftermarket RCA signals through low-level inputs.
Recommended wire sizes are 4–8 AWG for power and ground, and 12–16 AWG for speaker connections. Check your system’s electrical requirements and installation layout before choosing wiring.
Frequently Asked Questions
What RMS power does the Jensen JA4B provide?
It is rated at 90W RMS x 4 at 4 Ohms, 115W RMS x 4 at 2 Ohms, and 230W RMS x 2 bridged at 4 Ohms. Its total dynamic power is listed as 740 Watts.
Can I connect the JA4B to factory speaker outputs?
Yes. It accepts high-level speaker-wire inputs, as well as low-level RCA inputs for aftermarket audio sources.
Which settings can I adjust using the app?
The Jensen AMP app for iOS and Android controls EQ presets, frequency, volume, gain, and RGB lighting.
What wire sizes are recommended?
The recommended power and ground wire size is 4–8 AWG. The recommended speaker wire size is 12–16 AWG.
How does the limited warranty apply?
The product has a 4-year limited warranty when registered within 60 days of purchase.
Explore More
Shop the Jensen JA4B at 12 Volt Outlet. Want to learn more about Jensen? Explore our Jensen brand profile.
| Brand | Jensen |
| Model | JA4B |
| Amplifier Class | Class D Digital |
| Number of Channels | 4 |
| Total Dynamic Power | 740 Watts |
| RMS Power Output (4 Ohms) | 90W RMS x 4 |
| RMS Power Output (2 Ohms) | 115W RMS x 4 |
| RMS Power Output (4 Ohms Bridged) | 230W RMS x 2 |
| Audio Inputs | High Level (Speaker Wire), Low Level (RCA) |
| Audio Outputs | RCA Pass Through |
| App Control | Yes (iOS / Android) |
| Illumination | Customizable RGB |
| Crossover | Adjustable High and Low-Pass (32 Hz – 320 Hz) |
| Bass Boost | Adjustable at 45 Hz |
| Frequency Response | 20 Hz – 20 kHz |
| Signal to Noise Ratio | 70 dBA |
| Gain Adjustment | Variable 200 mV – 6 V |
| Power Supply | PWM MOSFET |
| Fuse Rating | 25A x 2 |
| Recommended Power/Ground Wire | 4 – 8 AWG |
| Recommended Speaker Wire | 12 – 16 AWG |
| Dimensions (H x W x D) | 5.5 cm x 21.3 cm x 14.2 cm |
| Certification | CTA-2006-D Certified |
Frequently asked questions
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