Undertone Audio MPDI-4 Microphone Preamp

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TURNLAB is a company based in the centre of Antwerp (Belgium) specialised in pro audio & electronic instruments.

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All our vintage gear is sold professionally serviced prior to sale (unless otherwise stated), in house, by our experienced team of dedicated technicians, and sold with warranty.

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The Undertone Audio MPDI-4 Microphone Preamp gives you four channels of extremely flexible microphone preamps and instrument DIs. From headroom, to sonic character, the MPDI-4 is a Swiss-Army Knife tool for the studio.

The Undertone Audio MPDI-4 Microphone Preamp is as musical as it is powerful and flexible. It features 4 individual Mic Preamp/DI circuits housed in a single 1RU chassis.  With bypass-able transformers, switchable output headroom, and adjustable THD characteristics, the sound of the MPDI-4 can range from astonishingly pristine to warm, thick, and harmonically colorful. It may well be the only preamp that is truly perfect for every situation!

The mic preamp has gone through exhaustive recording, listening, and analytical tests to end up with the best possible combination of components and features. Undertone's goal was to have something that could give the vintage musicality one would be accustomed to with a Neve or EMI pre, but still retain the option of running the mic pre cleaner when needed. Undertone came up with a design wherein the user has extraordinary control over the sonic character of the mic preamp by making it possible to bypass either or both of the transformers, change the overall headroom of the output stage, and alter the THD (total harmonic distortion) signature of the circuit. This fexibility now makes the UTA pre the frst pick for almost every recording situation. There is also a user switchable low impedance mode that changes the strapping of the input transformer. This mode performs extraordinarily well with passive ribbon mics.

The DI input was optimized for passive guitars and basses. Its exceptionally high input impedance and Class A circuitry make it the perfect choice when capturing passive instruments either for the purpose of re-amping or if you want to use the DI signal itself in the mix.

Undertone Audio MPDI-4 Microphone Preamp Features

• -10 to -60 dB boost range (in stepped 5 dB increments)
• Switchable -20 dB input pad and -10 dB output pad
• Instrument DI
• Switchable 600 ohm output load
• Switchable Low impedance mode ideal for passive ribbon microphones
• Front panel XLR–1/4" (DI) combo input
• Phase reverse switch
• + 48 V phantom power
• Bypass-able input and output transformers
• Mic-pre Input
• Mic-pre direct Line Output

Undertone Audio MPDI-4 Microphone Preamp Specifications

• INPUT VOLTAGE: 110-120/220-240 VAC, 60/50 Hz
• INPUT IMPEDANCE:
• • MIC IN TRANSFORMERLESS: 2 kΩ
  • MIC IN HI: 2 kΩ
  • MIC IN LOW: 500 Ω
  • DT: 4.7 MΩ
• OUTPUT IMPEDANCE (MIC OUT): 47 Ω
• FREQUENCY RESPONSE:
• • MIC PREAMP: 10 Hz - 80 kHz +0 /-1 dB
  • LINE IN/OUT: 10 Hz - 50 kHz +0 /-1 dB
• NOISE FLOOR (MIC PREAMP): -128 dBu (20 Hz - 20 kHz)
• MAX LEVEL BEFORE CLIP (MIC PREAMP): +27 dBu (or better)
• DISTORTION (MIC PREAMP): .003% at +27 dBu
• MAINS FUSE: 110V T 0.4 A / 240V T 0.2 A
• MAXIMUM POWER CONSUMPTION: 25 W
• DIMENSIONS: 19"(W) x 14"(D) x 1.75" (H)
• WEIGHT: 12lbs