Mix Cube

Those are better than Avantones and possibly better than the Auratone reissues I have. I've had Avantones and they were bad except for PA purposes, and have Auratone reissues which work better mix-wise. Those will reveal the sound of your amp because there's so little to them. Single-driver speakers

see I thought this but I don't believe it anymore. The frequency response plots (ironic to even consider the mixcube worthy of such analysis) are terrible. And it's a grotbox I get it, but there are huge resonances from 5Khz and up. The plot I saw (I'll link it) has about a 13db difference from 4 to

Are you talking about Klipsch RP-402S surround speakers? Those are not intended for stereo listening. (And those types of speakers aren’t good even as surround sound speakers with the way multichannel codecs are designed these days. They should be regular direct firing (i.e. monopole) speakers.) Als

As already noted- Auratones are better for the midrange focus purpose than Avantones, which are a bit too full range. Not sure which version you have (there are quite a few), but they should be useful if you understand their purpose.