There's a Dolby XP frame with 24 channels of SR on eBay right now for under $600, Buy It Now price. That's less than $25/channel for world-class NR. Yes, it's more channels than might be required, but what a deal! Keep the unused channels as hot spares. And, it's a long way from $1000/channel. If memory serves, there's enough input gain in an SR card to work at -10 and still calibrate. Output trims should go down as low as needed. As to calibration, it's not all that tight, there's a 2dB window, and, because of how SR works (Dolby A too), it doesn't multiply head bumps like dbx. For those unfamiliar with the term, narrow track heads like those found in 1/4" and 1/2" multi-tracks, have a low-end rise that relates to the narrow tracks - the "head bump". It's not always possible to equalize out, and can be several dB. Causes fits with dbx because it's a response anomaly between encode and decode. For dbx to track, the response between encode and decode should be as flat as possible, otherwise the 1:2 expansion goes a bit nuts and mis-tracks badly with audio in the head-bump zone.