Sinatra At The Sands, with Count Basie & the Orchestra
That's a good album for both sound, and judging a system, a good stereo image will also impart the dynamics of the room that are captured on this.
Just so happens I put it on last night but only got thru side 1, too much surface noise, I keep forgetting to run it thru the RCM.
Love all the Jack McDuff offerings, but 'Bringin' it Home' my fav.