one thing that was vital for my in ears experience was running a system where i monitored my unmolested sound directly from a headphone output in my rack,
and blended the monitor mix from FOH into my mixer/ears. eliminating the need to send my signal to FOH first and via round trip be erroneously altered before returning back to my mix/ears.
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the rocktron rack interface blends my rack’s wdw mix on its internal dual stereo mixer,
adds analog cab emulation,
and puts it on a headphone jack where i can listen to my rig right from the source exactly as i set it.
my signal also gets sent to the house on separate XLR outputs.
a monitor input on the rack interface receives the monitor mix sent from the FOH on a stereo trs 1/4” jack, minus my signal.
a “HEADPHONE MIX” knob adjusts the balance between the monitor mix v my rig sound and the “HEADPHONE VOLUME” set overall level.
the quality of the venue’s FOH monitor system and your earbuds are important too.