Hello fellow bassists. I own an SWR Studio 220 .I L-O-V-E the tone...AWESOME. One of my favorite features is the Transparency knob (pull out treble knob to activate). Playing a passive J-bass, this knob gives my instrument's high an end an "active" sheen. I use this function when the strings have a couple of gigs on them....NICE. I find, (unless I have brand new strings ), when I leave the Transparency off, the treble response is rather flat, even a little harsh...more of a high mid (1,2k) sound. I'm considering an SWR 350 ( the 220 is OLD and ready for retirement ). My question is : how is the high end response with a passive bass? I know the amp doesn't have the Transparency feature, I'm wondering if the high end is tuned high and bright, or, is it more of an upper mid sound ? I don't want to go the SM500,900 route, which I believe have the Transparency feature. I don't need that much power (weddings, corporate gigs), and I like to travel light. Thanks for your help.