miniDSP Flex Eight

miniDSP Flex Eight, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, Optional Stereo Dirac Live license for room correction, Bluetooth LDAC/APTX/AAC streaming. Array
599 USD
Stereo (2ch) Dirac Live License (Full Range)
Add a measurement Microphone:
Add a Microphone Tripod:
  • Description
  • Specifications
  • Support
  • Application Notes
  • Reviews

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miniDSP Flex Eight
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miniDSP Flex Eight

miniDSP Flex Eight : miniDSP Flex Eight, 400MHz Sharc DSP audio processor, toolbox for subwoofer or multiway speaker tuning, Optional Stereo Dirac Live license for room correction, Bluetooth LDAC/APTX/AAC streaming..
USD599.00 InStock Customer Support
Active Crossovers
 MG 5072

The Flex Eight is the latest member of the miniDSP Flex family of advanced audio processors. We’ve taken advantage of our flexible hardware architecture to cram a full eight channels of DSP and a world-class analog output stage into the compact enclosure.

With multiple digital inputs and eight unbalanced analog output channels, the miniDSP Flex Eight can implement active speakers up to stereo four-way. Flexible 2x8 signal routing supports many other configurations such as two-way, three-way and multiple subwoofers. As always, a full suite of miniDSP’s tried and proven audio processing functionality is included: FIR filters and parametric EQ on the input channels, and parametric EQ, crossovers, advanced biquad programming and delay on each output channel. 

The Flex Eight has USB audio, S/PDIF (RCA and optical) and Bluetooth (LDAC/aptX) stereo digital inputs. An OLED front panel display and volume control/encoder knob provides easy control. Last but not least, it is easily software-upgradable with Stereo Dirac Live® for full range correction (20~20kHz), the world’s premiere room correction system.

The miniDSP Flex Eight is the perfect solution for a modern compact integrated active speaker/subwoofer system. You just need to let your creativity do the rest!

Hardware Features

  • Processor: 32-bit floating-point 400MHz Analog Devices SHARC DSP
  • Multi-Core USB Audio processor (XMOS)
  • Bluetooth streaming: LDAC™/aptX™ HD/aptX™/AAC/SBC
  • Optional upgrade to Dirac Live® 3.x Digital Room Correction, Stereo 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 (USB Audio/SPDIF/Optical/Bluetooth)
  • Outputs: Unbalanced (RCA)
  • White/Black OLED front panel controller with IR control
  • Control and configuration by miniDSP Device Console (DC)

SHD 1200x174


 Flex Eight


Product Downloads

What's in the box?

  • Digital Audio Processor - Flex Eight
  • 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 Stereo 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 Eight leverages miniDSP Device Console (DC), our newest real time control interface. Stay tuned to our product page and manual for more details! 

flex eight full screen


Understanding LDAC™ Wireless audio


LDAC™ is Sony's High Quality wireless audio streaming and we at miniDSP thought it would be great to showcase its benefits. By nature, Bluetooth audio streaming is very convenient but it's not without its limitations and until recently has not been an audiophile experience. LDAC is a new CODEC enabling 3 x the data to improve your enjoyment. You can read more on the Sony LDAC™ page Sony LDAC™ page.

Comparison between LDAC & SBC

These pretty graphs are great but how about some measurements? We took some measurements with our Audio Precision APx555 to compare AAC Bluetooth with LDAC. Shown below are our measured results with a 24-bit 96 kHz source file with the following audio chain: LDAC/AAC in - > Flex - > Digital out to APX555. The lower distortion and noise of LDAC is clearly evident, with the SINAD metric being over 50 dB better! This translates in better audio performance for your wireless audio streaming. Not convinced by this graph? Have a listening trial and share with us your feedback!




Digital Signal Processor Engine

Analog Devices Floating point DSP SHARC ADSP21489 @ 400MHZ

Processing resolution / Sample rate  

32 bit/96 kHz (32bit/48 kHz with Dirac Live® license)

USB Audio support

UAC2 Low latency Audio - ASIO driver support (Windows) - Plug&Play (Mac/Linux)

Input/Output Configuration

2 channels in / 8 channels out

Digital Stereo Audio
Input Connectivity

1 x SPDIF on RCA connector
1 x OPTICAL on Toslink connector
1 x USB audio (stereo)
1 x Bluetooth with support for: LDAC™/aptX™ HD/aptX™/AAC/SBC
Supported Sample Rate: 20 ~ 216 kHz

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 (Dynamic Range Enhancer)

THD+N (Digital to Analog)

-111 dB (0.0003 %) @1kHz

Crosstalk (Digital to Analog)

-120 dB

Filtering Technology

Flex Eight: IIR (10bands/outputs) + FIR (Stereo bank on input @ 2048taps for impulse response correction)
Flex Eight with Dirac Live®: Full Range correction (20~20kHz) + IIR (10bands/outputs) / (Note: FIR and IIR filters on the input channels are not available to the end user if the Dirac Live upgrade is installed.)

Software control

Control and configuration by miniDSP Device Console (DC)

DSP Presets

Up to 4 presets


150x180x41 mm


IR Remote

Power Supply

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

Power Consumption

4.0 W (idle)
2.5 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.

Saturday, 19 November 2022
I built some 4-way tower speakers with each having a 15" sub, 8" woofer, 5" mid, and 1.125" dome tweeter, all individually sealed, and all Dayton Audio Reference series. I was originally going to build 3-way passive crossovers and use a 2-way active to integrate the sub. Then I saw this product and figured it's cheaper that building the passives and a 2-way active. I ended up buying a used Rotel RMB-1048 for $300. This is an 8-channel class AB amp with 40 watts per channel at 8 ohms, all channels driven. I thought it would be underpowered, but for everyday listening it’s perfect and the subs will shake the house at -12dB (2.5 watts). Integration of this product was fairly straight forward following the application guides on here. All my measurements were in-place, so I did not flatten the response of each driver yet. At some point I'll take one of the towers outside on a nice weekend day and do that. Each tower is probably 120 pounds, so I'm in no hurry. For now, with a 4-way, I was able to select passbands in which I knew each speaker had a fairly flat on and off axis response. I did some by-ear tuning as well. My input device is a Yamaha WXC-50. I have the Yamaha set-up in pre-amp mode and connecting it to the Flex via toslink. In pre-amp mode the Yamaha handles the volume control in the digital domain via its ESS Sabre ESS9006 chip. I keep the Flex powered on 24/7 and have it set to 0dB. I control the Yamaha with my phone and the Yamaha has a 12-volt trigger out that I use to turn on the Rotel. All in all, I’m very happy with the way things turned out.
Wes H