Behringer DR112DSP and DR110DSP. Problems persist after trying to work on the volume pots!

The Behringer DR112DSP and DR110DSP are proving to be a bit underwhelming. This powered speaker was promising and the demo and first shipment we got worked well. The next batch had problems with the volume pots being so noisy even after careful lubrication and trying to wear them in a bit. The limiter warning kept kicking in. Some just powered off by themselves at low volume levels after about 45 mins One DR112 tripped the power circuit at a house party rental which ruined the event an cost me the hire fee. All in all a bit of a waste of money, if you do decide to buy the go to a brick and mortar store and test the individual volume pots on the actual speaker you are buying not the demo floor stock to make sure that there are no immediate problems , the you might be lucky. I have tried to lube the pots with electrical grease which seems slightly better but not what you should have to do straight out of the box!!!