Atmasphere Class D monoblocks and AGD Audions GaNTube monoblocks.I’m a recent convert to the new breed of Class D amps. I’ve long been a valve amp fan with an Atmasphere OTL amp being my favourite. I‘ve recently retired and keeping a valve amp on all day was getting costly. My speakers are very efficient at 107db/W (Avantgarde Duo Omega horns) and also very revealing of any changes in the system.
When I read this, I thought I was reading one of my own posts as it exactly expressed my own situation 3 years ago. Then I was using valve amps (PX-25 and 845-based SETs) powering Avantgarde Unos.
I too had recently retired and was curtailing my listening hours because of the valve amps. I decided to switch to ss if (and only if) I could find an equally good or better sounding a ss amp. I was looking at Class A, AB and D and home auditioned a dozen amps and was expecting one of the Class A ones to win my affection. However not so, although the Accuphase A-36 is a great amp, but a little too civilised and slightly lacking in impact. The dozen included the NAD M32 and I decided upon this great amp in the end, despite it being one of the least costly.
This was upgraded to M33 when it became available and the Unos upgraded to Duos (pre-Omega) and currently Duo XDs. I'd now like to try the M33 against the Atma-Sphere Class D monos and the ADG Audion monos to see if either offered better sound than the NAD.
Did you home demo these 3 amps with your Duos, or was the decision after research, reviews and showroom demos? I did my tests at home after buying used amps, one new one and the rest were dealer demo units. But all were tested against the 845 mono SETs and other ss amps I had at home at the time.
Are you UK based? I guess not as the other amps you mention are unlikely to be available here - not yet anyway! If you are, I'd like to invite you to visit, bringing your miniscule but lovely Audions and we could do a NAD vs AGD workout with Duo XDs!
PS- Do you leave the Audions on 24/7 or switch them off? I'm sorry they don't have a trigger option so they could be powered up from the preamp.