[quote name='Gareth Hughes' timestamp='1371052421' post='2109189']
But.......the high pass filter is set at 150HZ, so depending on how steep the slope is it could take away too much low end.
[/quote]
Might depend on the room. When we played big rooms, we told the sound guy to dump from about 180 downwards as a starting point to avoid major feedback issues. There always seemed to be quite a bit of low end left.