Unfortunately, I've never tried my IEMs that way.
What I have done is to use my practice mixer when there was only one or two monitor mixes for everyone. I'll take the mix (which has even been the complete house mix before. Not ideal, but it certainly worked and was better than nothing) into one channel of my little mixer and my bass (and vocal, too, if I'm singing) into the other channels. I have a little Alto 4-channel mixer that was, what, $60? And I can send all of that stereo to my IEMs. I pan everything straight up, but it's still very effective.
It's a little more money to spend but since you are using the EW300, I think you'll be happier and have more flexibility for your, err, mix.
What I have done is to use my practice mixer when there was only one or two monitor mixes for everyone. I'll take the mix (which has even been the complete house mix before. Not ideal, but it certainly worked and was better than nothing) into one channel of my little mixer and my bass (and vocal, too, if I'm singing) into the other channels. I have a little Alto 4-channel mixer that was, what, $60? And I can send all of that stereo to my IEMs. I pan everything straight up, but it's still very effective.
It's a little more money to spend but since you are using the EW300, I think you'll be happier and have more flexibility for your, err, mix.
