Thank you for your responses. I did reach out to Atma-Sphere and spoke with Adam, Ralph was taking a well deserved day off. The recommendation, based upon clients that have Quads, are the MA-I MkII.3 monos. However, in the interim another brand has been offered up to me for considration. This is VAC, specific recommendations are: Standard 220 Monoblock, Renaissance 140 or MKIII Signature Triode Monos. I'd like to get feedback on these as well from the community. If those that are so kind as to respond would please provide some insight into some of the issues originally raised in this email: sound, heat, customer service, etc. Please note that I am more than willing to expand my consideration set of amplification choices.
Thanks to all who respond
Thanks to all who respond