Perhaps the Circes' woofers are wired for hi-impedance (suitable for tube amps)... if so change them to the 4-ohm setting (done by dealer or mfg?)
Also the bass on these speakers is very well damped so you won't get great gobs of bass.
If you had better performance with your 4B, this is a puzzle.
I assume you have two 7Bs in mono config, not one as your post suggests.
Also the bass on these speakers is very well damped so you won't get great gobs of bass.
If you had better performance with your 4B, this is a puzzle.
I assume you have two 7Bs in mono config, not one as your post suggests.