In reply to:

Are the 4s 8 ohm speakers - IOW, are they also less sensitive than the 8s?


The 4's are 8 ohm and the 8's are a little more sensitive at 6 ohm. The 8's are a little fuller sounding, going a little lower in the frequency range.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70