The C4's have a very nice midrange, lots of clarity. IMO the top and bottom end are a little rolled off but still able to provide good bass extension that you can feel. It does not have the speed or dynamics of the Watt/Puppy 7's. If I had to characterize the sound of the C4 I would call it tubey.
I would try a tube preamp and add cables and ic's that can enhance the systems speed.
I would try a tube preamp and add cables and ic's that can enhance the systems speed.