Thank you guys for the great information. Now I understand why there is a BIG difference between the sound I was hearing from my studio monitors and headphones versus the sound through the PA and amp. Now I have to work on dialing in the sound on the PA speakers & amp. The studio monitors I am using are small Mackie CR3s which I use in a very small room. I primary use the Helix with the studio monitors and headphones. The PA speakers are only used when I jam at my friend's house. I'm only an amateur and do not play out. Never understood the big difference in sound until now. Thanks again to all who posted replies, really appreciate it.