I have been auditioning the Spectral DMC15 SS preamp. I have been looking for a great SS preamp around $5k. The DMC15 SS has everything I'm looking for in a preamp. I took home a new DMC15SS for an audition and spent 3 days with the preamp. It had a very dark closed in almost choked presentation. Does this choked presentation open up after a prolonged break in period? Perhaps this presentation is just an effect of the new Super fader technology. I must say that I love the design and engineering principles behind Spectral, but could not come to grips with the presentation. If anyone has long term experience with the 30SS or 15SS please let me know your thoughts. My current preamp is a Nagra PL-L that is long in the tooth and needs service. My amp is a Nagra PSA that has adjustable input of 1v or 2v. I noted the Spectral preamps have a 1.6v output.