miniDSP Flex HT

miniDSP Flex HT, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, USB/HDMI ARC/EARC, WISA, Optional Multichannel Dirac Live license for room correction, Array
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  • Description
  • Specifications
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  • Application Notes
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miniDSP Flex HT
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miniDSP Flex HT

miniDSP Flex HT : miniDSP Flex HT, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, USB/HDMI ARC/EARC, WISA, Optional Multichannel Dirac Live license for room correction, .
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Active Crossovers
 MG 5072

The Flex HT is miniDSP’s answer to our customers looking for a pocket sized multichannel processor with HDMI ARC/eARC capabilities . Our team was able to cram a full eight channels of DSP power and a wide range of I/O into the unbelievably compact enclosure.

Eight-channel audio input is via eARC linear PCM over HDMI, or USB Audio. Additional stereo input is supported over SPDIF and TOSLINK optical. Internally, we’ve provided a full suite of miniDSP flexible’s routing and audio processing features: bass management, parametric EQ, crossovers, advanced biquad programming and delay/gain adjustments. In addition, the miniDSP Flex HT is software-upgradable with full-frequency Dirac Live®, the world’s premiere room correction system.

The eight-channel analog RCA outputs feature class-leading low noise and distortion figures. Last but not least, the Flex HT is miniDSP's first product to include WiSA (“Wireless Speaker and Audio Association”) capability. WiSA is designed specifically for low-latency multichannel audio – a perfect match for the Flex HT. The WiSA transmitter we build into each Flex HT can losslessly transmit all eight output channels to WiSA-compatible speakers and subwoofers. After a simple pairing procedure, you're good to go!

The miniDSP Flex HT is the perfect solution for a modern compact processor for home theater and multichannel sound. You just need to let your creativity do the rest!

REMINDER: Please note that the Flex HT does not support bitstream (e.g. Dolby/DTS) decoding. The audio source must be able to output linear PCM (LPCM) for multichannel support over HDMI. 

STOCK UPDATE(19/07/2023): This product is currently in final stages of firmware development to finalize HDMI test. We expect shipments to start in the coming Q3 2023. Thanks for your patience!

Hardware Features

  • Processor: 32-bit floating-point 400MHz Analog Devices SHARC DSP
  • Multi-Core USB Audio processor (XMOS)
  • HDMI EARC/ARC interface for multichannel audio in PCM. Note that Flex HT doesn't support bistream format (Dolby/DTS encoded). 
  • WISA: Multichannel (8ch) low latency, synchronized, Wireless audio. Compatible with compliant Wisa speakers. 
  • Optional upgrade to Dirac Live® 3.x Digital Room Correction, Multichannel (8ch) Full Range Room Correction (20~20kHz)
  • Audiophile performance with very low noise floor and distortion (SNR @128dB(A), THD+N @ -111dB (0.0003%)
  • Inputs: Stereo digital (SPDIF/Optical), Multichannel USB Audio streaming (up to 7.1)
  • Outputs: 8 channels audio duplicated to unbalanced (RCA) and WISA Wireless audio. 
  • White/Black OLED front panel controller with IR control
  • Control and configuration by miniDSP Device Console (DC)

Flex HT Front panel

Flex HT 1000px




Product Downloads

What's in the box?

  • Digital Audio Processor - Flex HT
  • IR remote v2
  • 12V univeral power supply (UK/EU/US/AU plugs)
  • USB cable  

Optional Items

  • UMIK-1 or UMIK-2 Measurement microphone
  • Dirac Live v3.x Upgrade for Multichannel (8ch) Full range correction (20~20kHz) / Must be selected in the shopping cart as an option. 
  • Microphone tripod

NOTE: The UMIK-1/2 are measurement microphones approved by Dirac Research. Knowing the major effect a wrong calibration/measurement would have on the final results of Dirac Live tuning, we strongly recommend that you select a UMIK-1/2 microphone together with your platform for a plug&play experience leading to best results. Any issues related to 3rd party microphones such as ASIO/USB audio driver incompatibility/Latency problems or incorrect calibration process will not be under our support structure by our support team. 

miniDSP Device Console (DC)

Flex HT leverages miniDSP Device Console (DC), our newest real time control interface with free Over The Air (OTA) upgrades for software and firmware upcoming enhancements. 








Digital Signal Processing Engine

Analog Devices Floating point SHARC DSP: ADSP21489 @ 400MHZ

Processing resolution / Sample rate

32 bit/48 kHz

USB Audio support

UAC2 Audio - ASIO driver provided (Windows) - Plug&Play (Mac/Linux)
Multichannel USB Audio interface (8ch) for up to 7.1 configurations

Input/Output DSP structure

8h IN(USB/HDMI) or 2ch IN(TOSLINK/SPDIF) => DSP =>  8 ch OUT (Analog & WISA outputs)

Digital Stereo Audio
Input Connectivity

1 x SPDIF (stereo) on RCA connector,
1 x OPTICAL (stereo) on Toslink connector
Supported sample rates: 20 – 216 kHz / Stereo source will be automatically assigned to Input 1&2

HDMI connectivity

ARC/EARC compliant for up to 8ch of LPCM audio streaming
Supported sample rates: 20 – 216 kHz
WARNING: No onboard Dolby/DTS decoding. Use your source (E.g. TV) to output in PCM mode.

WISA (Wireless Audio)

8 channels outputs via low latency, uncompressed & tightly synchronized audio via WISA protocol
24bit/48kHz, 5.2ms Fixed latency, +/-2µS synchronization, 5GHz spectrum

Digital Audio Output Connectivity

Not Applicable

Analog Audio Output Connectivity

8 x Unbalanced RCA

Analog Audio Output Impedance

200 Ω

Analog Output Max Level


Frequency Response

20 Hz – 20 kHz ± 0.05 dB

SNR (Digital to Analog)

125 dB(A) with DRE enabled

THD+N (Digital to Analog)

-111 dB (0.0003 %)

Crosstalk (Digital to Analog)

-120 dB

Filtering Technology

miniDSP DSP toolbox (routing, bass management, parametric EQ, crossover, gain/delay).
Optional software upgrade to multichannel Dirac Live® 3.x Full Range correction (20Hz ~ 20 kHz)

DSP Presets

Up to 4 presets


150x180x41 mm


IR Remote

Power Supply

Included external switching PSU 12V/1.6A  (US/UK/EU/AU plugs)

Trigger out

12V trigger out controls external ON/OFF powering of amplifiers

CEC control

HDMI CEC command for Mute/Volume/Standby

Power Consumption

4.8 W (idle, Wisa OFF), 6.5W (idle, Wisa ON)
2.9 W (standby)

Application notes on the miniDSP Flex Eight platform

In this application, we go step by step on how to tune your multiway speaker. Make sure to check it out in details!

In this application note, we will show you how to design an active 2-way loudspeaker with the miniDSP 2x4 HD/Flex. Using the 2x4 HD/Flex, you can either create a conventional (Linkwitz-Riley or Butterworth) crossover, or a linear phase crossover.

In this application note, we will show you how to integrate a subwoofer with your existing loudspeakers by using a miniDSP 2x4 HD/Flex. You can use an existing preamp, or replace a preamp and a DAC with the miniDSP 2x4 HD/Flex. (In the latter case, you will need to program a remote control to adjust volume in the miniDSP 2x4 HD.)

In this app note, we will demonstrate subwoofer integration for miniDSP's stereo Dirac Live processors using only the Dirac Live app for measurement

In this application note, we show you how to use Room EQ Wizard (REW) and its integration with miniDSP to equalize your subwoofer.

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