Best professional TEST CD?

The Sound Check/Test Gold CDs by MFSL, which have been out of print for years. Good Luck if you can find them. I was lucky and bought them when they first came out years ago. Much more accurate than the Stereophile Test CDs.

Try XLO's Test & Burn-In CD, it has everything you probably need. Sweeps, reference recordings, etc. I think you can get it directly from XLO. I found this disc better overall when compared to the Stereophile disc, which I used for a long time.

To the above, I would add Chesky's "The Ultimate Demonstration Disc".

Both the MFSL Sound Check/Test cd & the Chesky Ultimate Demo Disc have been very useful during auditions and setups.