NAD C275BEE break in period?

Thanks for the responses.. whats a proper way to break it in? At the moment I just leave it on with an average if 3 listening hours a day. It is preamped out from my Arcam AVR400 receiver.. the sound is definitely more bold and effortless.. but missing the sweet fluid midrange that the arcam has.. wondering if that gap will get filled over time.

I've been doing 2 sessions a day of 4 hours+ when possible.  You don't need high volume levels.

I had the C375BEE, BTW, and it clashed with my Totem Acoustic Rainmakers.  There was little in the way of a sweet midrange, at least in my case.  These NAD amps have a different approach that sees no increase in power going from 8 to 4 ohms, and I always wondered if that was why it sounded off with the 4 ohm Rainmakers.

Arcam is definitely in another class.

Receiver vs separate Amp = added *i/c.
Enough to account for the differences you are hearing.
Give the unit (and i/c) some time to settle~couple days.
Then can play around a bit *there to achieve the balance you looking for.