Hey Folks, I was doing some research on my internal passive cross over circuits in my mains today let me go into a little depth as to what I have for mains. My Main L/R speakers are Acoustic Research AR-9 Towers from the Hi-Res line. They are "Near Full Range" and play down to 32Hz @100DB after that they start rolling off fairly fast. The driver compliment is a pair of Mag-Alloy hemisphereical 5.25" Mids a 1" Plasma Hardened Titanium Dome and a 10" high excursion side firing bass reflex sub. The Crossover Network allows Bi Amp and Bi Wiring and the Points are 100Hz and 3000Hz. My question is why would you cross the Mids so high? I think they should have been crossed at the THX standard of 80Hz they should easily be able to reproduce from 80Hz to 3K Hz and this would make seperate sub integration a whole lot easier. My goal is to integrate my own D.I.Y sub and basicaly not use the 10's in the AR-9's when my sub is complete. I have a continiously variable x-over on the sub amp I can set from 120Hz all the way down to 40Hz so I can integrate if I want, But I keep thinking my Mids would sound better crossed at 80 and letting the dedicated sub play down from 80.. What do you think? I plan on yanking one of the passive crossovers and examining it to see what value caps they have on the Mids and I could replace that cap with a foilized poly audio grade cap from Parts Express and see how it sounds. I know doing this is a hit or miss deal, crossovers are tough cookies to crack and I probably won't improve anything but I need to make some modifications inside the cabinents anyway (adding V-Blok to the mid's enclosures and adding acoustic tiles to the back of the mids enclosures to break up any axial standing waves that may exist. Do you think it's worth a shot? Hit me with your complete honest opinion, harsh or not!