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I had a NAD3020, one morning it decided with no pre warning to destroy the decent speakers it was connected to and itself. The magic smoke escaped from everything. I guess it was some kind of DC that it shouldn't have been sending the speakers. Eventually the whole lot (except cables) went in the bin because the cost of repairing the bass drivers was prohibitive and the amp maintained a permanent fault light. I usually fix electronic gear down to component level but looking in this amp it was like a lot of class d, impossible to diagnose.
Airhead
I’ve owned both a NAD 3020v and an SMSL AD18 and I felt that the SMSL was subjectively better from a usability point of view but also sound quality. Obviously it’s set up dependent but they had more headroom with my speakers and it showed. I had to run the NAD at 90% volume and the SMSL at like 50%. Value for money was a no brainer too. $130 vs $400...
The SMSL has a huge power supply hence its small size versus the NAD, but the amplifier housing itself is metal, whereas the NAD is plastic which disappointed me. I’d say either go for something as small and as cheap as the SMSL, or go full size (which I ended up doing in the end). I got an Onkyo A-9150 and it’s great. Multiple digital and analog inputs. Only thing it’s missing is a USB input, but that isn’t the end of the world.
This is of course my opinion, completely subjective and your mileage may vary.