Hello, I have a pair MA GS20's (plus matching centres and surround) hooked up to an Arcam AVR450 home cinema amp, which I bought second hand last week. When playing two-channel music there's just something missing in the mid-range, it really lacks warmth. Is there anything I can do to improve the situation or am I stuffed? I believe the (pristine!) amp has been stood a good while, could this be a factor? I've maybe given the amp 30hrs of play since buying it. I'd read that MA and Arcam was a good match, now I'm not so sure. Any thoughts or words of advice greatly appreciated.