The MP 4 has been discontinued.
Support is still available from scratchlive.net.

| Parameter | Specification | Conditions |
| Phono / Line Inputs: | 2 stereo pairs of RCA jacks | Switchable RIAA curve |
| .....Input Impedance | 47k / 220pf | |
| .....Gain | 46 dB / 0 dB | 1 kHz |
| Line Inputs: | 2 stereo pairs | RCA jacks |
| .....Input Impedance | 20 kΩ | 1 kHz |
| .....Gain | 14 dB | 1 kHz |
| .....Frequency Response | 10-27 kHz (+0, -3 dB) | Gain 10 dB, 2 kΩ load |
| .....Noise, Unity Gain | -82 dBu | 20 kHz BW |
| .....Noise, Max Gain | -80 dBu | 20 kHz BW, re +4 dBu |
| .....THD+N | 0.05% | 20 kHz BW, re +0 dBu |
| .....Crosstalk | <-70 dB | 1 kHz |
| .....Control feedthrough | <-80 dB | 1 kHz |
| Tone Controls: | Baxandall | Two-band, shelving |
| Metering: | Dual mono, 4-segment | Peak responding |
| MIC Input: | Balanced instrumentation | ¼" TRS Jack |
| .....Input Impedance | 511 Ω | Each leg to ground, 1 kHz |
| .....Gain | 60 dB | 1 kHz |
| .....Frequency Response | 20-20k Hz (+0, -3 dB) | Gain 50 dB |
| .....Equivalent Input Noise | -111 dBu | 150Ω source, gain 50 dB |
| .....Common Mode Reject | >40 dB at 1 kHz | 150Ω source, gain 50 dB |
| House / Aux. Outputs: | Stereo | Balanced, ¼" TRS jacks |
| .....Output Impedance | 200 Ω | each leg, 1 kHz |
| .....Gain | 6 dB | 1 kHz |
| .....Maximum Output | +24 dBu | 1 kHz, 2 kΩ load |
| Converters: A/D | 24-bit / 48 kHz | 108 dB dynamic range |
| .....D/A | 24-bit / 48 kHz | 110 dB dynamic range |
| USB: | 1.1, full speed | 1 unit load (100 ma) isolated |
| Agency Listings: | UL/cUL/CE | |
| Power Requirement: | 100 to 240 VAC | 50/60 Hz, 7W |
| Construction: | All Steel | 19" x 1U rack-mount |
| .....Unit Size | 1.75"H x 19"W x 5.3"D | 4.4 cm x 48.3 cm x 13.3 cm |
| .....Unit Weight | 4 lb | 1.8 kg |
| .....Shipping Size | 4.25" x 20.3" x 13.75" | 11 cm x 52 cm x 35 cm |
| .....Shipping Weight | 8 lb | 3.6 kg |
| Note: All specifications are typical unless otherwise stated. | ||