In following review they have some interesting internal pictures of the A51 and C2. Its in norwegian, so I can't read it 
Parasound A51

Parasound C2



Parasound A51
Parasound C2

Luke: "Hey, I'm not such a bad pilot myself, you know"
CHRIS
Half of why I'm using those are just because the C1 can, and the other half is that I bought the C1 BECAUSE I had those things and needed something that could handle all of them.
Luke: "Hey, I'm not such a bad pilot myself, you know"
CHRIS
I am a great admirer of those who share what they know "for fun and for free", you folks are terrific. 
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