Hi, hopefully someone can help, ive recently switched from playing electric bass to UDB and have come across a problem when playing through a PA, especially at high volume. I am using a good bridge pick up and going through a pre amp with eq then into my aston bass amp. I then mic up my amp and put it through the PA system...the problem arises when we try and turn the double bass up...the result is a harsh distortion of the speaker but only from open E string...ive tried loads of things including turning the gain down and volume up in my amp..same result, changing the mic..same result, leaving all the settings the same and turning up the active speakers..same result..it appears there is a level that i can reach and get a great sound but anything above that level results in a horrible sound...do i need to buy a bass sub to deal with the low frequency? or am i missing a trick here...any advice would be amazing.. at the moment its quite disheartening when ive spent hours learning a 30 song set specifically to play on the double bass to not be able to play it at a gig! please help!