Ok folks, as anyone who has been to an Empty Fortune or Duress pub gig lately may have noticed, Our PA sometimes feeds back due to the close proximity of amps, mics & speakers. was thinkin about buyin a feedback destroyer but want to find out if they are any good and if it would work on my PA head. Its a carlsbro Marlin PA amp/mixer combo thingy (im not good with techincal terms).