Just got back to town (Fresno) after a long weekend on California's central coast, temps in the 70's, awesome!
Thanks for the heads up on running the Sapphire's unfiltered, Mike. Fortunately, I have the option of keeping the borrowed 65Hz in place until I find another pair. I won't risk it unfiltered. It sounds like 85Hz would be preferable. The audio sound we are getting is beautiful - detailed and smooth, that's what I really care about. Movies are just occasional entertainment.
Thanks to all you for your input also. I'm on the hunt now for an XLR set of ACI highpass filters, 85 or 65Hz. If anyone has a set, I'll fork out $100.00 if they are in good condition. If anyone has used any other option with good results, I am all ears (eyes?). I won't be setting up a HT receiver, as I am content to view movies run through my two channel system, so filtering in that manner is not an option.