Putting a Schiit Aegir in the same sentence as an MX-600/800/1000 is not fair on the Yamahas...
No comparison:
(my scans)
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Specs. I have an MX-600 here, it's an incredibly quiet amplifer (hiss). 16uV residual.
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And here, just for fun, here is the matching CX-1000 preamplifier. A lesson in how to build a preamplifier in 1989. Onboard D/A converter too.
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The design aesthetic unfortunately hasn't stood the test of time. Yamaha mixed jutting angles with clean lines, something they fixed in the next series, the MX-630/830 range of 1990/1. It had slightly rounded panel tops and bottoms, softer controls and a way nicer look. Trouble is, the performance took a hit.