Hello RWD:
The RS1x crossover box is required for the proper operation of the mid/tweeter panels. The xover in the bottom of the panels IS NOT FULLY PASSIVE. You MAY damage your mid/tweeter panels running direct. For your info, please check this PDF I put up for you at my site:
http://www.tiac.net/users/ltm/RS_I_technical_sheet.pdf
It clearly shows caps in the line to the hi-pass outs.
EMIM mylars are no longer available, I'd hate to see you ruin a fine speaker. Lord knows, I must have owned and tweaked 5 pairs of RS1x over the years! Please RWD, proceed with extreme caution!
beemer