Were to get fuse box for dedicated line?

Here's your source for the good ole' fuseboxes & Buss W20 ceramic edison base fuses:
http://www.renewalresources.com
You can still find ceramic W30's at the hardware store, but the W20's are now plastic. The new plastic based W20 fuses seem to sound alright, & although I've been using ceramic myself & never have done a shoot out between them, they both work much better than glass fuses which do sound harsher. Actually those fused disconnect boxes would probably work well also, but I would probably wire around (bypass) the internal switch contacts.

If your going to run a dedicated line for your audio system,don't sell yourself short-run 2 dedicated(at least)Its only more wire and it will fit in the conduit. I ran 2 dedicated lines to my system,and its one of the best tweaks you can possibly do. If you do it yourself,or get a reasonable electrician its not that expensive. Don't skimp on the outlets either. Do some research in the archives on A-gon. There is a ton of threads,and some very good information. PS-Change your electical panel to breakers. It makes life alot simpler(and probably safer)

Breakers vs. fuses are very bad advice; not at all recommended. Fuses are the superior protection device above & beyond any lousy circuit breaker.

Use of more than a single dedicated circuit is setting yourself up for possible ground hum issues, due to ground potential imbalances, & is also not recommended.