Down4Sound Down4sound D4S-XP28 DSP | 2-In/8-Out

Description 1 Review Description The DOWN4SOUND D4S-XP28 DSP is designed to give full control over your car audio system with powerful yet straightforward tuning tools. Built for professional installers and competition-level systems, the XP28 provides precise signal processing, reliable performance, and flexible configuration without unnecessary complexity. Featuring 2 inputs and 8 outputs , the XP28 allows clean control over multi-amplifier and multi-speaker systems. Each output channel can be tuned independently for accurate crossover setup, time alignment, phase adjustment, and system protection. The unit also includes an external Bluetooth antenna mounted on the top of the processor for reliable wireless connectivity when configuring the DSP. Key Features 2 input / 8 output digital signal processor External Bluetooth antenna mounted on top of the unit Tiffany style RCA connectors for secure signal connections Durable Down4Sound chassis with integrated display Independent gain and mute control per output channel Master volume control Save and load custom tuning profiles Password protection to prevent unauthorized changes Built-in screen saver with rotating text Tuning and Signal Control 15-band graphic equalizer on input channels Parametric EQ on inputs and outputs Butterworth and Linkwitz-Riley crossover filters Crossover slopes up to 48 dB per octave Flexible routing between inputs and outputs Time Alignment and Phase Control Full delay control for speaker placement correction Phase adjustment and phase inversion Precise timing alignment for multi-speaker systems Limiter and System Protection Adjustable limiter with threshold control Dynamic attack and release settings Protects speakers and amplifiers from signal overload Key Specifications 2 RCA inputs 8 RCA outputs Independent gain control per output Master volume control Frequency response: 10 Hz – 22 kHz Total harmonic distortion: <0.01% Signal-to-noise ratio: >90 dB Input impedance: 10 kΩ Output impedance: 47 Ω Maximum input voltage: 5.6 Vpp (+8.2 dBu) Maximum output voltage: 5.6 Vpp (+8.2 dBu) Dimensions 180 mm × 120 mm × 40 mm 7.08 in × 4.72 in × 1.57 in Ideal Applications Competition-level car audio systems Multi-amplifier installs requiring precise DSP tuning Active front stage systems Subwoofer and full-range system alignment Professional car audio installations View All Close 1 Review 4 Cool Unit Good Features Posted by James Drummond on Oct 29, 2025 This thing works awesome for what it is. Love the features like physical channel muting for tuning purposes. Gave it 4 stars because I wish it would remember channel muting and also an app like EZY would be awesome! Even if I could download and upload other people profiles that would be cool View All Close