Spectral DMA 150 compares to Rowland Model 6 and 8

Vtin-
I have a spectral DMA 180/DMC 20 connnected to Avalon Opus with all Spectral/MIT Cables. This system was jointly designed to work together. In my experience, the Rowland amps tend to be much warmer than the Spectral, which has a much cleaner, more neutral sound.
Good Luck

Tim
I completely agree. Unfortunately, I wasn't able to go for the spectral front end (too $$$). I opted for the Accuphase DP-75V-which works well within this system.
Carl

Matt
Both the standard DMA-150, and DMA-180 require a Spectral preamp. Spectral also requires the use of MIT interconnects, and speaker cables to keep the warrantee in effect.
It does limit your options, but as stated above, the synergy is incredible.

Carl