Picked up a Spectral DMC-5 preamp and a modified Carver 1.5t amplifier from a friend of mine for my music system. I was using a B&K Reference 50 preamp and an Adcom 5500 amp and those sounded good together, but I can't believe the difference the Spectral preamp makes over the B&K, it's almost like it lets too much through. And for as small and light as it is, the Carver amp definitely has more oomph than the huge Adcom. Next will be building a bar, with this built into it, rather than the table it's on now.
Doing this freed up my old system, so I put it in my shop. Overkill for a shop system for sure, but I love it.