Hi,I,m with Nsgarch on this one.Harshness can often be tamed with different cabling.The first thing to try would be solid core copper speaker cable rather than stranded. Solid core lighting cable can sound excellent and is very cheap from electrical suppliers.I know people with very expensive and fantastic sounding systems that use this.Commercial alternatives would be Axon 4 or Kimber.
The next thing to try would be carbon fibre interconnects like Van den Hul the First.These are the last word in smooth,sweet sound without loss of detail.
JT