miniDSP Flex HTx

miniDSP Flex HTx, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, USB/HDMI ARC/EARC, Optional Multichannel Dirac Live license for room correction,
949 USD
Add a measurement Microphone:
Add a Microphone Tripod:
HDFury HDMI adaptor
Multichannel (8ch) Dirac Live License (Full Range)
TRS to XLR cables (1m/3ft Long)
  • Description
  • Specifications
  • Support
  • Application Notes
  • Reviews

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miniDSP Flex HTx
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miniDSP Flex HTx

miniDSP Flex HTx : miniDSP Flex HTx, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, USB/HDMI ARC/EARC, Optional Multichannel Dirac Live license for room correction, .
USD949.00 InStock Customer Support
HomeTheater Series
 MG 5072

The Flex HTx is the bigger brother of the Flex HT, targeting the need for a multichannel processor with HDMI ARC/eARC capabilities and stellar analog and USB audio capabilities. Within a single rack unit, we packed all the possible connectivity we could fit.

Eight-channel audio input is via analog audio (RCA and TRS), eARC linear PCM over HDMI1, or USB Audio. Additional digital stereo input is supported over SPDIF and TOSLINK optical. Internally, we’ve provided a full suite of miniDSP’s flexible routing and audio processing features: bass management, parametric EQ, crossovers, advanced biquad programming and delay/gain adjustments. In addition, the miniDSP Flex HTx is software-upgradable with full-frequency Dirac Live®, the world’s premiere room correction system.

Continuing miniDSP’s focus on affordable high-performance audio, the Flex HTx features class-leading low noise and distortion figures. An OLED front panel display and volume control/encoder knob provides easy control.

The miniDSP Flex HTx is the perfect solution for a modern compact processor for home theater and multichannel sound.

REMINDER: Please note that the Flex HTx 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(04/12/2023): Units are now in QC stage. Shipments will start mid december in chronological order. 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 HTx doesn't support bistream format (Dolby/DTS encoded). 
  • 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 @127dB(A), THD+N @ -120dB (0.0001%)
  • Inputs: Stereo digital (SPDIF/Optical), Multichannel USB Audio streaming (up to 7.1)
  • Outputs: 8 channels audio duplicated to unbalanced (RCA) 
  • White/Black OLED front panel controller with IR control
  • Control and configuration by miniDSP Device Console (DC)
  • Rack mountable with removeable rack EARS


 Dual Flex HTx 1200px


Flex HTx for datasheet




Product Downloads

What's in the box?

  • Digital Audio Processor - Flex HTx
  • IR remote v2
  • 12V univeral power supply (UK/EU/US/AU plugs)
  • USB cable  
  • Removeable Rack EARS (1RU)

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. 

Audio Precision APX555 Measurements

Digital to Analog (input 1 kHz, 0 dBFS) / AES17 20kHz LPF

Flex HTx 1k SINAD 231117

Flex HTx DR 231117

Flex HTx 20 20k THDN 231117


miniDSP Device Console (DC)

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




miniDSP + HD Fury gear

HDFury has a wide range of adaptors for HDMI interfacing that fits perfectly along with miniDSP's Flex HT/HTx. Our team therefore decided to give you the option to package your Flex HTx together with Arcana or Vrroom devices. Check our app note for more details on how to interface your unit with HDFury. 


Flex HT with HDFury Arcana





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 / 32bit / 44.1~96kHz

Input/Output DSP structure

8ch IN (USB/HDMI/Analog) or 2ch IN (Toslink/SPDIF) => DSP =>  8 channels OUT (Analog)

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: 32 – 96 kHz / Supported sample sizes: 16-24bits
WARNING: No onboard Dolby/DTS decoding. Use your source (E.g. TV) to output in PCM mode.


Balanced 6.35mm TRS

Unbalanced RCA

Analog Audio Input Connectivity

8 x Balanced TRS

8 x Unbalanced RCA

Analog Audio Input Impedance

200 kΩ

100 kΩ

Analog Audio Output Impedance

300 Ω

150 Ω

Analog Input/Output Max Level

4 Vrms/4 Vrms

2 Vrms/2 Vrms

Frequency Response

20 Hz – 20 kHz ± 0.1 dB

20 Hz – 20 kHz ± 0.1 dB

Digital to Analog (input 1 kHz, 0 dBFS) / AES17 20kHz LPF


127 dB(A)

124 dB(A)


-120 dB (0.0001 %) / 120dB SINAD

-117 dB (0.00014 %) / 117dB SINAD


-132 dB


TRS Analog to Analog (input 1 kHz, 4 V RMS) / AES17 20kHz LPF


120 dB(A)

118 dB(A)


-114 dB (0.0002 %) / 114dB SINAD

-112 dB (0.00025 %) / 112dB SINAD


-130 dB

-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 (20 Hz – 20 kHz)

DSP Presets

Up to 4 presets

Dimensions (HxWxD)

41.5 x 429 x 236 mm


IR Remote

Power Supply

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

Trigger out

12V trigger out controls external ON/OFF powering of amplifiers, 3.5mm jack

CEC control

HDMI CEC command for Mute/Volume/Standby

Power Consumption

16.5 W (idle)
3.7 W (standby)

Application notes on the miniDSP Flex HT platform

In this application, we go step by step on how to use Flex HT with HDFury Arcana and Vrroom product. Stay tuned for more updates. 

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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