Speaker placement and first reflection points - of course. Isolating the tube amp was huge for me. Following many of the Jim Smith/Getting Better Sound recommendations also very helpful, for me the biggest was getting rid of the rack on the front wall - gobsmacked. Makes sense though, that's the closest first reflection point in one dimension. Got the Ghia speaker feet yesterday and can't wait to try them this weekend.
Most surprising - the chair. On another thread, I was tipped off by a certain pizeo-electric specialist that my prized Ikea Poang chair has very poor acoustic properties. Trials proved he was right, I have a new chair ordered, but in the meantime, now I can actually feel the resonance vibrations in the chair pad when spls exceed 85-90 dBs, and this is not a good thing, for the SQ or anything else.
Oh, and speaker grills stay on for me.
Most surprising - the chair. On another thread, I was tipped off by a certain pizeo-electric specialist that my prized Ikea Poang chair has very poor acoustic properties. Trials proved he was right, I have a new chair ordered, but in the meantime, now I can actually feel the resonance vibrations in the chair pad when spls exceed 85-90 dBs, and this is not a good thing, for the SQ or anything else.
Oh, and speaker grills stay on for me.