Thank you for your interest and response. I should clarify, the C75's that I bought are 6323's, but don't have the cross-over found in the service manual for 6323's on this site (which is identical to the CX100 cross-over found in the manual on this site). I wondered if there was an earlier cross-over version which these speakers might

I am curious about the evolution of the 6321-6323-6343 series of speakers (C75, C75 and CX100 respectively). I couldn't find a service manual for the 6321. The service manuals on this website show the same, fairly simple cross-over for the 6323 and 6343, although Beocentral implies that the cross-over was simplified in the CX100 (in addition to