As many have noted, these are speakers that can be easily modified to improve sound quality: vibration and internal resonances need to be reduced. What did I do? - Gluing the side walls and the bottom with STP Bomb Premium bituminous anti-vibration material. - Gluing the inner walls with STP Biplast Premium sound absorber - Replacing capacitors with K78-34 - Gluing the places of fastening the speakers to the body with soft rubber around the perimeter (circle). Materials in the amount of 2400 (2022). I published the results on the Internet, in Google Plus (if anyone is interested, I will attach the link). After the work, the weight of each column reached 9 kg. I felt a change in sound. 1) The bass became collected, clear, a striking difference "before" and "after". 2) Highs and mids sound very musical.
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