I have anice pair of 123A-1's. I did a calculation on them using the WinISD programme, and have put them in some big 7cu ft boxes. Gives the flattest response, with best timing. It is acting pretty much as a fullranger here, and I am experimentiing with adding on midrangers and tweeters. I have tried crossing over some tweeters at around 1K (well 24uF cap) and at higher ponts. (eg 8F cap, and much higher with a very eficient super tweeter. Sound is very nice, but I am wondering if I am missing out on some midrange? Whereddoes the driver start to roll off?
Hope someone knows!