miniDSP Flex Balanced Audio Processor


Flex Balanced is the balanced analogue I/O version of miniDSP’s Flex series of compact but high performance audio processors.

The miniDSP UMIK-1 and UMIK-2 calibrated omnidirectional USB microphones are ideal for taking measurements with Room EQ Wizard or Dirac Live. UMIK-1 measures frequencies up to 24 kHz. With its larger capsule and higher sample rate, UMIK-2 reliably measures frequencies up to 96 kHz.

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Flex is the third generation of miniDSP’s popular line of compact 2 in / 4 out audio processors. It retains the powerful floating point processor but rethinks the I/O architecture to provide customers with different input and output options in a compact chassis. miniDSP Flex is available with single ended analogue (RCA), balanced analogue (TRS) or digital (S/PDIF via coaxial RCA or optical Toslink) outputs with superb audiophile performance.

  • 2 in / 4 out audio processor
  • Flexible matrix mixer to route audio between input and output channels
  • USB, coaxial, optical and Bluetooth digital inputs, plus RCA analogue input
  • Analogue RCA outputs
  • Individual parametric EQ, high and low pass, delay and gain trim controls for each output channel
  • Optional Dirac Live room correction (requires additional licence)
  • Four fully customisable presets
  • OLED display
  • Infrared remote

All versions include a set of digital inputs including USB, S/PDIF (RCA and optical) and Bluetooth (LDAC / aptX). An OLED front panel display and volume control / rotary encoder provide easy control, and there is an infrared remote included for convenience. The Flex series is packed with miniDSP’s tried and tested audio processing functionality. It comes as standard with flexible parametric EQ, IIR & FIR filters, crossovers, advanced biquad programming and delay on each output channel. With the purchase of an optional software licence via the Device Manager companion app, all versions can also run Dirac Live® filters for full range (20 Hz – 20 kHz) tuning.

The miniDSP Flex will find myriad uses in applications ranging from a compact digital stereo preamp through subwoofer integration and optimisation to active speakers, home theatre and recording studios. You just need to let your creativity do the rest!

Additional information




Audio Inputs

1 x coaxial RCA, 1 x optical Toslink, 1 x USB type B, Bluetooth, 2 x balanced analogue TRS

Audio Outputs

4 x balanced analogue TRS


400 MHz Analog Devices SHARC DSP

Dimensions (WxDxH)

150 x 180 x 41 mm

Documents and downloads

Flex series product brief

Flex series user manual

Flex with Dirac Live user manual

Frequently Asked Questions

miniDSP audio processors offer a lot of flexibility and not every possible use case requires taking measurements with a microphone. However, if you are going to use your miniDSP processor for room correction, subwoofer integration or as an active crossover for your speakers, then you are going to want to take some measurements using software like Room EQ Wizard (REW) or Dirac Live.

miniDSP’s UMIK-1 and UMIK-2 omnidirectional USB measurement microphones work perfectly with REW, Dirac Live and most other measurement software. Both models come with individual calibration files for horizontal and vertical placement, to provide highly accurate measurements in either orientation.

The lower cost UMIK-1 microphone has a sample rate of 48 kHz. This allows it to measure audio frequencies up to 24 kHz. It covers the entire audible band and provides more than enough bandwidth for subwoofer integration or room correction duties, where attention is mostly focussed on the low frequencies.

For those who want to understand the behaviour of their speakers or room beyond the audible band and into the ultrasonic, miniDSP offers the UMIK-2. UMIK-2 is equipped with a larger, more sensitive microphone capsule and a higher end analogue to digital converter, which provides a maximum sample rate of 192 kHz. This enables UMIK-2 to reliably measure frequencies up to 96 kHz (two full octaves more than UMIK-1).

Your miniDSP Flex Balanced Audio Processor will normally be delivered in 2-3 days.

Delivery is free on orders over £100. We deliver anywhere in the UK using premium tracked delivery services from DPD Local, UPS, TNT and Royal Mail.

When you by a product from us, you will have 30 days to decide whether or not you want to keep it. If you decide to return it for any reason, even if you just changed your mind, it will not cost you a penny. Just let us know that you want to return it and we will take care of the rest.

We will agree a collection date with you and send you a pre-paid shipping label for the return trip. You can have full refund or you can try something else instead. It is up to you. All we ask is that you take good care of the product, along with any accessories and packaging, while you are deciding whether or not to keep it.

We accept all major credit and debit cards, including Mastercard, Visa and American Express. We also accept Apple Pay and Google Pay. Payments are securely managed by industry leading payment processor Stripe and protected by SSL encryption. We will not store your card number or other payment information.


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