My experience falls in line with Tbg. I had read about computer isolation but pretty much figured the difference would be small at best. When I ordered the Ultra 5s for my speakers the Ultra SSs that were under speakers were freed up to sell or test elsewhere. I then remembered writings about computer vibrations and so I decided to test them on external hard drive where music is stored and computer. The difference was shocking, especially under firewire external HD with music. When playing familiar music when I set Ex. HD on top of Ultra SSs I could not believe what I was hearing. You could literally hear the vibration draining out and the sound become much clearer,detailed and engaging. I have repeated for many others for shock value. Some more improvement was heard after doing same with imac. After all this gain I went for all the gusto and bought a AQ Diamond firewire cable for external HD and it also had marked improvement. It was an ear opening experience.
