Need a preamp with tone controls!

Some great advice, thank you all! I will end this post someday with what I chose to purchase.
Sincerily,
Steve

Yes, I have the 802s, all drivers are in great shape. I bought the Parasound Halo A21 under many recommendations. Very happy with it! Currently using an NAD integrated amp for the preamp. It has tone controls, is probably the last item stopping total sound refinement. I agree that 70s and 80s music is the golden age...at least for me. Thus the desire for tone controls to correct room acoustics and poor recordings. The Parasound J2 would be my first choice if it had tone controls. I am looking for that level of quality, but used from Agon/ebay, or store demo pricing. I haven't seen tone controls on Vincents either, which model/s? Classe CP800 also has them but I'm not very fond of how those look...too retro-futuristic, allhough great performance and quality. I like the idea of trying a tube preamp to soften, a bit, the sound of my entirely solid state system.

I'm currently using the NAD C-352 integrated as my preamp, lot of flexibility, but it definitely feels like it's holding back all my Halo A21 amp has to offer. What I really need is to try boths preamps I truly want in my home, the McIntosh C-50/52 and the C-2500. But I don't know how to do this without paying some restocking fee or more shipping costs. 

Thanks for the tip audioman58! Spread Spectrum stuff is very notable gear, never thought to look there.  There are so many brands, ya know...can't think to check them all. I will take a look!