I'm presently playing thru a Road 440 Bass Amp [375 watts RMS ]with 2 large cabinets with an 18" speaker in each cabinet. The sound is earth shaking to say the least. But I'm looking for something smaller, lighter and more portable. The 18's weigh 90 LBS each and the Head weighs in at 35 LBS. and I'm getting tired of moving around this "artillary" from gig to gig. A friend of mine who WAS using a Sunn Collisum Top and 2 cabinets with 2-15" speakers in each one recently purchased an Acme Low B-2 cabinet[acmebass.com]and an Eden WT 400 head. VERY VERY PORTABLE!!!and It sounds GOOD [he loaned the set up to me for my last gig] But IMHO it does not have the LOW END the 18's give and I like. I was considering a Gallien-Krueger 1001RB-210 or the 1001RB-115 Combo, but I'm still not sure. Another bass player suggested to use 2 Hartke KickBacks. A KickBack 12 and a KickBack 15. He said to run my bass thru the KickBack 12 and use the XLR jack out on it to the input on the KickBack 15, this way the 12 will give you punch and the 15 will give the low end. Any suggestions? Portability is a Priority.