I have put the speakers on the stands and immediately heard a single deep note at the bass register, whatever I listened to. It was so unpleasant that I had to turn off the subwoofer, Rel Strata. L96AB maplin code. If I fill the stands with sand, I wont be able to return them, but I dont find them an improvement. They make the speakers sound very "bass" but it does not do anythin for the music. Before I had the speakers on a shelf above the amp. The stand is heavy duty steel, and at 21in I have put the speakers upsidedown to get the tweeter at ear level when I am sitting down. Any thoughts on what I should do?