Coolsat 5000 has been known to grab below that. I know my Pansat 1500 and 9200 can grab the stuff that is just below (1945, 1970) but never can grab the transponder for KFTL on AMC6 (s/r 1666) on a blind scan
I think the slower you (set the) scan, the better your chance will be? The faster scans will miss it, while the slower scans tend to do a more detailed search? So, get a receiver with slow scanning search engine.... I think?
One of my favorite peeves==Traxis 3500 I have has found channels with SR of 1505, that's the lowest I've seen yet. Seems like the best receivers for low-SR scanning are the ones that are a little older, or have the 'detailed' blind-scan feature. I have a Coship 3188C that also is older, simpler but has very good sensitivity, also will do a "under 2000 SR" scan. Seems the Merc II or the Traxis 3500 are two of the best for finding the low-symbol rate channels.