Woolmer: If you check my numerous posts, you will see I am a big ARC fan. Even owned the SP-17 a while back. It's a nice pre.
Having said that, I recommend searching the Forum for posts about the HD 220. I seem to remember some mixed comments.
As for me, I'm a tube head. I think the HD 220 is a Class D SS amp. Don't know about the synergy between ARC tube gear and Thiel, but a good match for the SP-17 would be a pre-owned ARC VS-110, or even better, the VS-115. I own the VS-115 (w/ KT-120 tubes) and it's a sweet amp.
Good luck and let us know how you make out.
Having said that, I recommend searching the Forum for posts about the HD 220. I seem to remember some mixed comments.
As for me, I'm a tube head. I think the HD 220 is a Class D SS amp. Don't know about the synergy between ARC tube gear and Thiel, but a good match for the SP-17 would be a pre-owned ARC VS-110, or even better, the VS-115. I own the VS-115 (w/ KT-120 tubes) and it's a sweet amp.
Good luck and let us know how you make out.