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

2-input, 8-output DSP for detailed active-system tuning
SKU: D4-DP-XP28 DSP

$119.99

Rating:

BEST FOR - Competition and advanced multi-amplifier systems Active speaker systems requiring independent output tuning Installers who want detailed limiter, crossover, phase and delay control

2 inputs and 8 RCA outputs

15-band graphic input EQ

Limiter, phase and delay control

Signal flow

A flexible digital signal processor with eight independently tunable outputs, graphic and parametric equalization, precision crossovers, limiter controls and professional system-setup tools.

Compatible systems

Aftermarket car-audio systems with low-level RCA signal Multi-amplifier and active speaker systems

A DSP lets you shape, route, delay and level individual output channels before amplification.

Build your signal path

Inputs - 2 channels

2 low-level RCA inputs

Outputs - 8 channels

8 low-level RCA outputs

RCA input voltage

Not listed

RCA output voltage

Not listed

Digital inputs

Not listed

How much tuning control do you get?

Equalizer bands per output channel

Graphic EQ

15 bands on the input EQ

Parametric EQ

Not listed

EQ Adjustment controls

Graphic and parametric EQ controls

Equalization summary -

15-band graphic input EQ plus parametric EQ on inputs and outputs

Align every speaker

Crossover control

Butterworth and Linkwitz-Riley filters Slopes up to 48 dB/octave

Time alignment

Full delay and alignment control; adjustment range not listed

Phase control

Phase inversion, alignment and delay control

Presets

Save and load custom tuning profiles

Control method

Bluetooth-connected tuning interface; exact supported devices are not listed

Bluetooth

Bluetooth connectivity for tuning

Optional controller/accessories

Not listed

Audio performance

Sampling rate

Not listed

Frequency response

Not listed

Signal to noise ratio

Not listed

dynamic range

Not listed

Total harmonic distortion

Not listed

Input impedance

Not listed

output impedance

Not listed

Power, size & environment

Operating voltage

Not listed

Operating temperature

Not listed

Dimensions

Approx. 7.08 x 4.72 x 1.57 in

Weight

Not listed

More dsp tools

Adjustable limiter with threshold, attack and release
Independent output gain and mute
Frequency generator, sweep and pink-noise tools
Password protection for saved settings

Plan the installation

Required connections

Fused 12-volt power
Ground
Remote turn-on as required
2-channel RCA input signal
RCA cables from DSP outputs to amplifiers

Installation notes

Disconnect the battery before wiring. Mount securely in a dry, ventilated location, route RCA cables away from power wire when practical, verify every channel assignment, and begin tuning at conservative levels.

Plan your inputs, output channels, amplifiers and speaker crossovers before wiring.

What's included

DSP unit; remaining package contents are not listed

COMMON QUESTIONS

A DSP gives you detailed control over how audio signals are routed and adjusted before reaching the amplifiers. Depending on the model, this can include equalization, crossovers, output levels, time alignment, phase adjustment, signal mixing and channel routing.

Your DSP needs enough inputs for the signals coming from the factory or aftermarket source and enough outputs for every independently controlled amplifier channel. Active systems generally require a separate DSP output for each tweeter, midrange, midbass and subwoofer channel you want to tune independently.

A graphic EQ uses predetermined frequency bands, while a parametric EQ allows you to select the frequency and usually adjust its gain and bandwidth or Q value. Parametric control is more flexible for correcting specific peaks, dips and speaker-response problems.

Only when the product specifications explicitly state that the EQ bands are available per output channel. Review the Graphic EQ Bands Per Channel and Parametric EQ Bands Per Channel specifications on this page. If a value is not listed, per-channel availability has not been verified.

A DSP can integrate with a factory radio when it accepts the required high-level speaker signals or compatible digital inputs. Check the input types and supported input voltage before connecting factory speaker outputs. Some installations may require an additional interface or line-output converter.

You can perform basic setup yourself, but advanced tuning benefits from measurement equipment and experience. Before playing the system, verify input routing, output assignments, crossover frequencies, output levels and speaker polarity. Begin with conservative settings to protect the speakers, then save a backup before making further adjustments.

Custom Speaker Pods