SounDigital XP 400.4

The SounDigital XP 400.4 was developed for high-end car audio systems that prioritize compact dimensions, high efficiency, and precise sound. Despite its extremely space-saving enclosure, this 4-channel amplifier delivers impressive output power and is ideal for driving front and rear speakers or, in bridge mode, powering a subwoofer.

The XP Series’ modern Class D technology ensures high efficiency, low heat generation, and reliable performance—even during extended listening sessions. Thanks to variable high-pass and low-pass filters, the amplifier can be optimally adapted to different speaker and subwoofer configurations. Both RCA and high-level inputs allow for seamless integration into aftermarket and factory radios.

With its outstanding signal-to-noise ratio, high damping factor, and compact design, the XP 400.4 is an excellent choice for high-performance audio upgrades in spaces with limited installation room.

Technical Specifications

• 4-Channel Class-D Amplifier
• RMS power at 4 Ω: 4 × 66 watts
• RMS power at 2 Ω: 4 × 100 watts
• RMS power (bridged at 8 Ω): 2 × 132 watts
• RMS power (bridged at 4 Ω): 2 × 200 watts
• CTA-2006-compliant performance specifications
• Frequency response: 5 Hz – 36 kHz (-3 dB)
• High-pass filter (HPF): 45–850 Hz
• Low-pass filter (LPF): 45–850 Hz
• Filter slope: 12 dB/octave
• Bass boost: not available
• Signal-to-noise ratio (SNR): 96 dB
• Damping factor: 200
• RCA input sensitivity: 0.2 – 2.0 volts
• High-level input sensitivity: 1.5 – 15 volts
• Operating voltage: 9–16 volts
• Efficiency: 83%
• Current consumption (music): 17 A
• Maximum current draw: 34 A
• Recommended fuse: 20 A
• Recommended minimum battery capacity: 40 Ah
• Power supply connection: 10 mm²
• Speaker terminals: 2 × 1.5 mm²
• Remote connection: 1.5 mm²
• Dimensions (L × W × H): 113 × 119.3 × 50.8 mm
• Weight: approx. 0.58 kg