I have a 568.2mm, modified Clux and 3xM33 speakers.
I am not happy with the overall sound and suspect my room would benefit from room correction.

I have tried moving the speakers and believe the room is the problem.
Room size is 14ft wide, 9.5ft deep and 8ft high. The front speakers are positioned approx 7.5ft in front.

I listen mostly to music (Trifield)

I am considering buying a second hand G61r/G68 and hope the mrc would make an improvement.

Alternatively, would adding a HD621 to the 568.2 offer a sonic improvement over buying a G61R/G68 with it's mrc.
I can only afford either the HD621 or a G61R/G68.
Advice is much appreciated.

NUC i7, Roon, HQ Player, Lampizator L4G5, Meridian Explorer 2, MRendu + linear PS, EAR V20, Woo Audio WA22, Senn 800, Audeze LCD XC, PMC GB1i.