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I thought that moving to mono blocks would be easy enough from where you are at now. Changing that was a big step forward for me. Mono block amps closer to the speakers, 2ft speaker cables and no pre-amp. I did end up increasing amp power from 60 - 250w as well, that sometimes helps with woofer control.
Then I started to hear what the speaker position was doing. I've still made compromises in terms of speaker position and I'm now running a digital desk which functions as a pre amp but it all still measures pretty flat at the listening position.
I have 2 pairs of speakers I'm swapping between so I can see pretty quickly what is room and what is speaker. Sometimes that helps, mostly it just doubles the amount of work required!
I have the possibility to move to mono amps - the cyrus power amps will comfortably run in mono and another will only set me back £300. Speaker cables are 3m. I could easily hack off a metre if necessary.
You've given me an idea though. I can try a different source to the power amp...that didn't shed any light :/