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Thanks, this is very helpful and motivating!

In this situation, I sit directly in front of the speakers with only a single listener. And the full-range cones are quite small (100mm?), we're not talking 4" here (it all has to fit on my desk with my monitor).

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4" are 101.6mm, though overall they're more like 120mm. The situation for me is quite similar (initially placed on/behind the PC desk) However my build is rather wide (20cm) due to the double MDF of the walls. Not sure they're necessary, though (would shave off 38mm).

The issue are usually the woofers, since these need displacement. 4" is already quite small. Maybe look for designs with passive radiators on the front and the woofers on the side? (I'm not deep in enough to make concrete recommendations).

Thanks. Turns out the speakers are actually only 2". You mentioned MiniDSP, which seems to be a collection of commercial products. It's not clear what exactly I would do here, my intuition says it might be fun to just take one of my existing ESP32s and use the ESP-DSP library to cobble together my own frequency filters, buy a 4" woofer, build an MDF enclosure and then just enjoy :)

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