Spectral DMC 20 Series 2 vs, Spectral DMC 30 SL?


Any insights on these preamplifiers? Some comments made that the older spectral DMC 20 Series 2 is even better in some aspects??
thanks
umaasa
I auditioned a series 2 DMC 20 and a DMC 15 in a spectral/MIT system in my home and there was no comparison. The DMC 15 was the better choice. The 15 is in a different league! There was no debate. It was evident immediately. Both preamps had been on for 24 hrs. From what I have been told the new 30's sound even better.
What is the list price on DMC 15?

I called Spectral, and they told me the same thing---find a DMC 15 vs. buying an older 20.
I auditioned the 15 vs the 20 and went with the 15, no contest. I think the 30 was similar to the 15, but more $$$ and remote.