OK ---- I've shied a way from using a preamp between the mic and PA since the time I overheated the amp and it thermal'd out for 15 very quiet and embarrassing minutes as the singer was trying to sing in Braille. So what's the need anyway and what am I doing wrong? I've got two Peaveys, one is an 8-channel head and the other is a 4-channel combo. Neither like the extra oomph that the pre pushes out, but honestly before they self protect they sound a lot nicer. I might be imagining that though. Does the preamp go in line where I'm putting it, or should I put it into an effects loop or what? I've run some pedals in line for splatter, reverb and delay with my harmonicas and even though I am sure they toss some extra power at the input, they don't make it angry enough to thermal out. I could also dump the singer and solve the issue a lot easier too. That's an option. Peavey XR8600D w/Kustom 15s and a Mackie 18" self powered woofie. BTW- "SHE" also uses Digital Reference mics, and I'm really surprised that they have a much nicer response curve than 57s and don't drop off in the upper freqs where her range lives. I've reconsidered that my old go-to mics (Shure Beta 87As) may not be all that good for a female voice and the upper register of my harmonics at the same time.