I have recently acquired a number of square 1 inch soft dome tweeters. manufacturer is Philips of Belgium part number dd0100972. after some research roger russell confirmed them to be McIntosh units used in the xrt 20c McIntosh loudspeaker. they are supposed to be comparable to the round Philips AD 0163HE-T8. does anyone have basic specs on this driver? currently running a 1st order x-over at 3000hz and am quite surprised by their sound. While they may not be morel mdt33 (currently in my 2ch setup) they are darn close! any support for this driver is welcome as I am planning to use them in small mtm actively x-over for my computer system.