I just picked up an Iamp 500 and am loving the tone. I do have a question about the input section of the preamp. I'm using a passive jazz style bass into the passive input and I can't drive the input to clipping. I'm concerned that I am not getting full power from the amp. When I turn the input level, output level and boost the bass all the way I can get the output clip light to barely flicker but the input overload light still doesn't come on. I've used this bass with other amps and never had a problem with input levels. I've emailed EA regarding this and am still waiting for a reply. Has anyone else had a similar experience? Do you think something is wrong with the amp?