I upgraded from a 30SL GEN ONE to the 30SS. After 300 plus hours or two weeks, the unit starts to open up. I ran the audio out of my Plasma set box through the 30SS 24/7 and the CD player in another input. After 1500 plus hours I feel the 30SS is fully broken in. The 30SS has a lower noise floor, with greater resolution, less colored, etc, then the 30SL. I use one MIT ISO-HC with Z-Cord 2 pc's for the 30SS and one HC for the CD player on separate 20 amp circuits and a 4 circuit sub panel. With this isolation you can here the improvement of the 30SS. I can still here a noise floor issue of dimming or setting the display at the normal setting. At the normal setting the 30SS has a slightly fuller mid range presentation. With the display dimmed the presentation has greater resolution but with less body,( slightly leaner mid presentation,( speaking, vocals, etc). I think the 30SS was voiced with the display set in the normal position. I prefer the normal display setting and don't feel the slight improvement in resolution warrants the trade offs. My previous 30 series preamps had similar display change effects. because the 30SS has a lower noise floor, you can here the effect more clearly.