There is definitely a market for Tc-50s in good condition. I own Spica angelus, and I will not part with them. I am more doubtful that there is a market for your subwoofers. I think you could possibly get $300 for the tc-50s.
Spicas excel at imaging and subtlety, but are not so good at bass, high volumes or dynamics. If your interest is primarily home theater and you're more interested in dynamics and bass then I think you should sell the spicas and get something more suited to your tastes.
If you really like the sound of the spicas and would like to fill in the bass and add a little more dynamics I can suggest a used REL strata subwoofer. I use this with my angelus. It is a self powered subwoofer, so it eases the load on your amplifier and mates perfectly with the main speakers. The only down side is that they cost upwards of $700, even when used.
I hope this has been helpful.
Spicas excel at imaging and subtlety, but are not so good at bass, high volumes or dynamics. If your interest is primarily home theater and you're more interested in dynamics and bass then I think you should sell the spicas and get something more suited to your tastes.
If you really like the sound of the spicas and would like to fill in the bass and add a little more dynamics I can suggest a used REL strata subwoofer. I use this with my angelus. It is a self powered subwoofer, so it eases the load on your amplifier and mates perfectly with the main speakers. The only down side is that they cost upwards of $700, even when used.
I hope this has been helpful.