Instruct: Classify the given review as either positive or negative.
Query: sorry Infinity, this one does not sound good.

I have owned a pair of Infinity Beta 20 for 4 years, and I am not a happy owner, not at all.First, the good ones - their high frequency reproduction is pretty good, and they do have little resonance.Now, the ugly, they have very poor mid-range, it is muddy and unclear, at any volume level. This is especially apparent for low pitched vocals. Just how bad does it sound? Well, my $15 Altec Lansing desktop speaker sounds clearer, and I paid $400 for them.Because of this experience, I have lost confidence in Infinity speakers. The C.M.M.D. is more of a marketing scheme, than real benefit.