We have a Pioneer VSX1020 receiver and the Cambridge IV ensemble which consist of 5 satelitte speakers and a subwoofer and we also have 2 tower speakers that are set up as the main speakers.
We are toying around with the idea of upgrading out the center speaker. Space is limited. Anything you would sugest? I am sure it will be an improvement.
That subwoofer only accepts high-level inputs:
Cambridge SoundWorks Ensemble IV Speaker System Review price specs - Hi-Fi Classic
How are you connecting that to the receiver, which has an RCA preout (unamplified) like all receivers do? Does it come with a separate amp module?
Edit: I get it. The AVR is wired to the "sub", and the "sub" outputs to the speakers and does the filtering. The AVR is set to no sub and all speakers to Large. In that sense it's not really a subwoofer, but a bass module for the satellites.
This isn't really compatible with the LFE track in Dolby Digital 5.1 sound.
Plus, you have no control over the bass cutoff, which is only designed for the Kloss speakers and is not conducive to mixing and matching your own speakers with different capabilities into the system. Any normal speaker would be directly connected to the AVR and would bypass the bass module. That must be how your towers are wired?
I would consider updating everything and retire the Cambridge. It sounds like you got many years of service out of them, but it's probably time to move on. A real subwoofer will be the most impactful upgrade you ever make to the system.