HiFi or not HiFi? That is the question!

[DanielT]

I know them. I bought two blank boards
But:
1. it's not better than my own DIY (ground loop is not optimized)
2. because of Brexit, I paid half the price for custom taxes

Aha, interesting.

You may have already thought about this: MiniDSP? Crossover plus set EQ, which you basically always need to do with subwoffer.

Note #4 in the thread.

thomann t.racks DSP 4x4 Mini Review

This is a review and detailed measurements of the thomann t.racks DSP four by four matrix DSP. It was kindly purchased new by a member and costs just US $99. I really like the form factor here and inclusion of brackets for mounting in cars and such. Inclusion of balanced I/O is much...

audiosciencereview.com

Edit:
Plus a measuring microphone to do EQ setting (if you do not already have a measuring microphone). For example:

Order the miniDSP UMIK-1 Measurement Microphone

Buy the UMIK-1 online at SoundImports ✓ Same day shipping ✓ Low shipping rates

www.soundimports.eu

Maybe too much gadgets for your solution? Depends on what level you want to put it on.

 

[Larudakote]

You may have already thought about this: MiniDSP?

Of course! I used 2x4 for friends systems and a discontinued Nano AVR HD for my main system (which replaced a MiniDSP 2x8). I still have an amazing 2x4 HD in my drawer.
But, you know, make my own complete DIY system in a box is a goal... until hiss & hum will knock me down
If I fail, I know what to do with the unused MiniDSP 2x4 HD!

Plus a measuring microphone to do EQ setting

I have it too with REW software.
A disaster in my bad shape living room. But my 56 ears become more tolerant! Unlike my children's ears, which I trained in sound.

 

[gnat_leader]

The make or break for a Class-D amplifier is the output filter. Some of the really cheap ones use little bobbin style inductors that have rather high series resistance and do not carry output currents well at high volumes. Others use dirt cheap capacitors that really don't do the job of taking down the high frequency pulse chain, allowing it to leak into the speakers. So be sure you're looking at quality parts in the output filters...

what is a "high frequency pulse chain"?