The only thing I can think of is a little thing called a headphone amp. I'll show you a link. http://www.musiciansfriend.com/product/Live/Sound/Signal/Processors?sku=180615 It may require some different wiring but it should help you out a bit. We used these things in the studio I worked at. I figure you can go from the mixer to this then to your monitors and still have an output for your phones.