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RE: "giant killing" class D amps?

Zetex was bought by CSR so probably no difference there. I was unaware that CSR is now part of Qualcomm.

The M32 has a very similar spec but it does have a great touch screen and it has a bit more power. The M32 has 4 MDC slots (2 large and 2 small) with 2 free slots for BluOS card, etc. The 390DD has 3 MDC slots (1 large and 2 small) but they all seem to be used if the photo on NAD's site is correct - which means you have to forgo the analogue inputs if you want to add the BluOS card - they are both large size. The M32 has a headphone socket.

I assume there's a step up in quality in areas such as casework and probably power supply to justify the higher price and perhaps explains the extra 2Kg in weight.

I'm very pleased indeed with the M32 and I'm sure you will be too. I have the BluOS card fitted so I can access my music stored on a NAS and internet radio of course - and streaming services such as Tidal and Qubuz. The M32 supports MQA - not sure about the 390DD. I'm looking to get an M50.2 soon in which case I won't need the BluOS card in the M32.


Edits: 12/30/17
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