Hi Steve,
I'm confused.
You wrote," I use pre DSP on all channels, having the same compression & EQ in monitors as the FOH."
A) Compression and EQ are always active on L/R House channels.
B) If you switch a monitor mix to Pre DSP, you have no channel EQ or compression in the monitors, only the monitor master EQ.
C) So how can you have a Pre-DSP monitor mix, and the same compression and EQ in Monitors as FOH?
Years ago a Split to House and Monitor mixers was common, as was a separate monitor tech.
Alternately, XLR-Y cables were often used for splitting some inputs to two channels for mixing monitors from FOH.
Enter, in 2003, the modest-budget Yamaha 01V96 digital mixer, which allowed one analog input to be sent to two or more channels.
Only Gain and Pad were shared on the split channels, allowing for a virtual House mixer and another Monitor mixer on one console.
These days I still do some shows with smaller input counts on a DL1608, and pull out the XLR-Y cables.
Once the gig gets over a few inputs, I switch to the DL32R, which allows one input to be split to two channels.
I work with some vocalists that can sing fairly softly, and then so loud it will take your head off.
Modest compression on the house mix channel keeps the audience happy, no compression in the monitor mix channel keeps the vocalist happy.
Another use for split channels:
I work with a Fiddler who is a State Living Treasure, who does not hear high frequencies very well, and wants them turned up in the monitor.
While at the same time, to make the Fiddle sound good in the house, I am turning the High's down.(Also,
this is the channel that gets sent to other musicians on stage.)
Whenever I do an open mic show, one channel goes to house and monitors ~ there just isn't time for dealing with separate channels.
Thanks and good health, Weogo