The MiniDSP DDRC-22D room correction software has received many good reviews, which you can find on the internet. I purchased this in May 2017 and connected it up with great excitement, only to find that it was not compatible with my DAC (my stupid fault for not reading the DAC manual properly!!). To resolve the problem would have required that I spend considerably more money on a new streamer, cables, etc., and it was more than I was prepared to do. I put it back in the box where it has remained since. What you get if you bought this:

• Dirac Series 24/96 high-resolution audio processor — DDRC-22D
• Universal 5 VDC power supply with interchangeable plugs (UK/EU/US/AU)
• License for Dirac Live Calibration Tool Stereo for miniDSP (Win/Mac)
• USB cables for Dirac Series audio processor and UMIK-1
• UMIK-1 calibrated measurement microphone
• Microphone tripod stand
• Remote

The licence and the remainder of the one year warranty are transferable. Total cost for getting it here (purchase and tax) was NZ$1450. It is in immaculate condition. I am hoping someone can get to use this to make the most of their audio experience.