Quite tricky one this.Im cant give you anything technical well i will try. Do you have anything stored behind the speaker in question - IE other HI-FI? could be a reflection? - Possible amplifier fault or balance issue....I would try swapping speakers to see if the problem persists then you will know if its the speakers - or amplifier - or source? could be any number of things....
We are here to help Ben.....
Ahh bugger just read the thread again
Bi Amplification
Quad 33 with current Mod for CD
2 Quad 303 Bi Amped
Turntable
Thorens TD 125 MK1 , SME 3009 S2 Non Improved , Shure V15 II , SME 2000 Plinth
CD Transport & DAC & PSU
Marantz 6005 , Beresford Caiman , Paul Hynes SR4
Loudspeakers
Tannoy 615 MK2
Cassette
Goodmans GSW 435