The Cornwall I and Cornwall II are both good sounding speakers, so based on your current choices I would pick the one that is in excellent condition. Also, be aware that there is an early version of the C II and a later version of the C II. The early version is physically more similar to the Cornwall. The later version (1986-1990) has the flush surface mounted mid horn and tweeter horn and the crossover is attached to the rectangular speaker wire cup on the back of the speaker, which is easy to remove. If you plan to buy a larger style high end crossover for a later version C II, you will need to remove the woofer to install the bigger board and to snip and splice some wires, then re-install the woofer. https://2d73e25b29782b6d6766-9c8af5cbfef16739445bc76457060528.ssl.cf2.rackcdn.com/CW_Time_Line_MK_070522_635120773187750000.pdf
Any listeners with lack of bass from Cornwalls may have a speaker wire polarity problem between the amp and speaker, or between the internal crossover and the woofer, or possibly a room acoustics condition. I like my Cornwall II's.
Later version Cornwall II pictured below.
Hi Khornukopia...I'm new to this hobby and just picked up my first set of '76 Cornwalls. Haven't done anything to them yet but I'm definitely not getting the bass response that I should be based on comments on this thread. I'm guessing its for one of the reasons you mentioned above or maybe my receiver just isn't powerful enough? I just bought a Denon AVR-X1100W which was about the most I could afford and I also wanted to get into the surround sound arena. Do you think I'm just under powered? I've checked the polarity amp-to-speakers but haven't looked at the crossovers yet (I am planning on replacing the caps from Crites shortly). Thanks in advance.
Adam