I have recently picked up a GKMB115II from GC. I bought it for a few reasons, moderate price, very low weight and GK reputation. However, I'm not sure I can get the tone I'm looking for out of it. No matter what setting I have the amp on there seems to be an odd overtone to the sound that I am not sure how to describe. Being a fussybugger when it comes to equipment I took my bass a SR250 down to GC and another music shop and tried out several other combo amps. I felt the GK products had this strange harmonic/overtone sound across the board to some degree or other. My bass I know is on the cheap end which may be contributing to the strangeness in the tone. The Ampeg and Acoustic combos I tried seemed to not have this issue or if it was there it was there to a lesser degree. I admittedly am a bass noob so perhaps there are some things that I'm overlooking. I also plugged in a 600 series Ibanez and ran it through the same amps, with fairly similar results. I am considering trading the MB115II in for an AmpegBA115HP 220 watt combo since I am still inside the GC 30 return period. Same price range speaker size, but rated 20 more watts. Unfortunately for me the Ampeg weighs in at a whopping 80 lbs, and I have had some health issues recently (hernia type) so the weight is a real factor. I'd really like for the GK to work out, but I'm not sure I can dial in the tone, maybe there are some other light-weight options out there?