Hello, I have a Stewart World Tour 2.1 that I run my Read pre with. It is has serious headroom and I love its power........but it seems noisy.....as soon as the lights come on my tweeter(s) buzz, as I increase the volume on the amp it gets worse. Are these amps just that way or should they be quiet? I understand any amp will have some noise if pushed hard, but its almost more than I can handle. In a live situation, I fear it will make a heck of alot of noise through the pa. Anyone??