Re: Yorkville U15 processor settings
When using mine passive, which I do a good amount of the time now-a-days, I hang each box of the side of a PLX3402. So up to ~1100 watts per box. I have actually never used a real limiter on mine, (short of a basic clip limiter on the amp), and have never had any big issue. I have noticed that with these boxes you will hear very noticeable power compression so you will plenty of fair warning to not push them any further. (I've noticed this probably 3-4 times in 4 years.)
In my gigs though, I usually don't have any problem keeping them out of any type of clipping/limiting of the amp. It is only in the several loud many hours long festival settings that the power compression really can start to kick in.
Take Care,
Phil
P.S. Good to see that my 'by ear' processor settings are very close to Evan's measurement tweaks. I usually also have a 300-350hz PEQ setting that I will either leave flat or take a couple dB out depending on the room.