Ensoniq DP/4+ Parallel Effects Processor

Ensoniq DP/4+

The Ensoniq DP/4+ creates 24-bit digital effects using four independent processors, and features four independent inputs and outputs with full internal mixing capabilities. The Ensoniq DP/4+ is equally at home in a professional recording studio, home studio, guitar rig, MIDI setup, or PA system.

The Effects
The Ensoniq DP/4+ Parallel Effects Processor has over 50 high fidelity fully programmable digital effect algorithms. Reverb, chorusing, flanging, delay, distortion, pitch shifting and an assortment of other programs are provided with dynamic control over most of the settings. There are 400 effect presets; 200 ROM (Read Only Memory) and 200 additional RAM (Random Access Memory) presets for you to edit or store your own creations.

Parallel Processing
While other multi-effects processors only allow one input signal to be “effected,” the Ensoniq DP/4+’s four-in, four-out design permits stereo processing of four parallel channels (multi-processing). There is only one user interface, but up to four different input signals can each go to a separate internal signal processor. Multiple inputs and outputs also allow for special types of effects, like vocoding and ducking.

The Ensoniq DP/4+ can be used as one huge effects box, two stereo-in effects boxes, three effects boxes, or four separate effects boxes. The routing between the four processing units is completely programmable, allowing for any combination of serial and parallel effects.

The Ensoniq DP/4+ also offers paths to feedback the signal, and side-chain capability. The variable architecture and rich assortment of algorithms provide for unusual effect structures not found in fixed routing systems. The unique output mixing capability can also save you mixer effect return channels by mixing the stereo outputs of the four effects units down to a single stereo pair (outputs 1 and 2).

The Ensoniq DP/4+ is equipped with an advanced digital signal processing system based on the Ensoniq Signal Processor (ESP) chip. The ESP chip is designed specifically for digital audio signal processing, and in the Ensoniq DP/4+, four ESP chips work in conjunction with 16-bit analog-to-digital and digital-to-analog converters to provide a studio-quality output signal.

The digital effects processing capability has been designed to complement any input source  (balanced/unbalanced; +4dBu to-10dBV), and all of the algorithms (except the Guitar Tuner) can have specific parameters modulated by various MIDI and non-MIDI controllers such as a keyboard’s pitch wheel, a CV Pedal, etc.


  • Released: 1995
  • Quantization: 16 Bit
  • Sampling Frequency: Unknown
  • Frequency Response: 2Hz-18kHz
  • Dynamic Range: 90dB
  • THD: Below 0.032%
Current Value
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Ensoniq DP/4+ Reviews

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Sound Quality8.5
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