I've recently noticed that on my Eltax Jupiter speakers, the high frequencies (particularly female voices) produce a strange distortion that sounds almost like you are listening underwater (hope that makes sense). I notice it mainly on the rear speakers (as they are closest), but I can also hear it in the front speakers if I place my ear fairly close to the tweeter. Is this simply because they are dirty cheap speakers that can't handle high frequencies? Or could the speaker cable be to blame (I plan to investigate this tonight if I can pick up a short length of decent cable)? Or are they blown? Finally, does anyone else have the same speakers notice this effect? I'm using a Sony STRDB790 amp, with Sky+ for the source (I get the same effect using the optical connection or the normal phono connection). Thanks .