miniDSP Flex HTx Audio Processor


The miniDSP Flex HTx is a powerful and flexible full width 8 in / 8 out processor with analogue and digital inputs and analogue outputs.

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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Brand: miniDSP Category:


The miniDSP Flex HTx is a full width 8 in / 8 out processor with analogue and digital inputs and analogue outputs. It is the only full width component in miniDSP’s popular Flex series and their engineers used the extra space to add RCA and balanced TRS analogue inputs and outputs for each of the eight channels. Flex HTx is a powerful tool for adding room correction to your home theatre, building precise crossovers for multi-way speakers or tightly integrating multiple subwoofers.

Eight channel audio input is via linear PCM over HDMI eARC or USB Audio, analogue RCA or balanced analogue TRS jacks. Coaxial and optical S/PDIF provide additional stereo inputs. The eight channel analogue RCA and balanced analogue TRS outputs feature class-leading low noise and distortion figures.

Internally, miniDSP has provided a full suite of flexible routing and audio processing features, including bass management, parametric EQ, crossovers, advanced biquad programming and delay / gain adjustments. In addition, the miniDSP Flex HTx is software-upgradable with full range Dirac Live®, the world’s premiere room correction system. The licence is purchased through the miniDSP Device Console app for Windows and macOS.

  • 32 bit floating point 400 MHz Analog Devices SHARC digital signal processor
  • Multi-core XMOS USB audio processor
  • HDMI ARC / eARC interface for multichannel PCM audio
  • Optional upgrade to Dirac Live® 3.x eight channel full range digital room correction
  • Audiophile performance with very low noise floor and distortion
  • USB, coaxial and optical digital inputs
  • Multichannel RCA and balanced TRS analogue inputs and outputs
  • USB recording option
  • OLED front panel display, rotary encoder and remote control

Please note that the Flex HTx does not support decoding of Dolby Digital, DTS or other proprietary audio formats. Your source must be able to output linear PCM (LPCM).

Additional information




Audio Inputs

1 x coaxial digital RCA, 1 x HDMI eARC, 1 x optical Toslink, 1 x USB type B, 8 x analogue RCA, 8 x balanced TRS

Audio Outputs

8 x analogue RCA, 8 x balanced TRS

Signal-to-Noise Ratio

124 dB (RCA), 127 dB (TRS)


0.0001% (TRS), 0.00014% (RCA)


400 MHz Analog Devices SHARC DSP


White OLED display

Dimensions (WxDxH)

429 mm x 236 mm x 42 mm

Documents and downloads

Flex HTx product brief

Flex HTx 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 HTx 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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