we recently bought a Studiolive 16.0.2 to obtain an individual (mono) monitoring mix. Therefore, I connected the aux via 1m cables to an additional headphoneamp (not a cheap one) and we either use ~10m long extension cables, or an IEM system to reach our headphones. The problem is now, that the sound quality is horrible (somehow similar to a highpass) in comparison to the main out which sounds perfect on the headphone out (the GEQ is not activated!). The internal effects are not really usable that way as it just creates an annoying mess. Is that just a consequence of the mono signal chain, maybe in combination with the length of the extension cables, but that should rather generate a low pass, right? (And it's the same via the IEM)
Right now, the 3 band EQ does not affect the aux and the main equaly, which makes it a little hard to achieve a useful mix. Is that the normal behaviour, or am I missing something? I hope that I described the problem detailed enough and would really appreciate your help!