I want to make this quick. After 2 days wrestling with the Hypex Filter Designer, the tool you must use for Hypex DSP products, I can confidently call it unfriendly.
I am using a Hypex FA 123, 3 channel DSP + Class D amplifiers on a single plate. Thank goodness their tech support is so friendly and responsive. When I first got it the firmware was misset and the interface kept imagining it was the 2-channel version, the FA 122. This left me unable to use the 3rd channel which was intended for the tweeter.
To make a long story short, after getting the firmware patched up (thanks Jeffrey!) I then had a long slog through the channel configurations and filter settings. The biggest hassle with the HFD is that nothing is instant. Experiments take about 10x longer to make than they would with say miniDSP. You must hit upload, wait 20 seconds, and then fix the bug where it resets all of the mute settings.
This makes it very hard to ease up into the right filter settings. Once you even get close you want to stop and leave it alone.
It is seriously about 10-30x more work to set up a filter here than in miniDSP or Roon by comparison. Otherwise, great hardware, guys!
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