Since a couple of months I've decided I want some sort of sub for my rig: a hartke 3500 that puts out 240 watts in my Swr Henry Jr. 4x8. I use a yamaha bbg 5a 5-string trough it, and I have 2 reasons to get a sub: -So I would be louder( my hartke really pushes) -So I would have better defined lows: most notes below E (starts at D#) really suck, as in: there seems to be some kind of lag and it's all mud, it totally flaps(at lower volumes it's just great but we don't rehearse at practice volume). They're also a whole lot quieter, making me not cut-trough as good(which my henry is real good in for the E-string and higher). I've experience in cab-building: a while ago i built a closed 1x10 for my practice amp and last week I put the finishing touch to our band's 2x6, with purpose singing. It's got 2 eminence alpha-6, and it goes down to 80 hz at -3, they're placed in a 33,4 l box. Yes i've read the speaker cookbook(the dutch version) My goals for this sub: -max 600 l -flat or -3db(if there are other factors to compensate) at 31 hz. -not too much mud 16-20 ms groupdelay max, rules out a bunch of them. BUT... I'm limited on choises... The only site where i can get my speakers from is http://www.netzmarkt.de/thomann/gruppe-PASP-0.html so if anyone(Joris?) knows places in the Benelux where I could get them or a web-ordering site in Europe I would be very happy. Also, does anyone know if the fane colossus 24" is still in production?