What help do you think you need? Is this an AV7005 or an SR7005?
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"The speakers have to be cranked up to get good sound out of them. The output from the marantz drops off in direct mode."
Sounds like an voltage gain/input sensitivity mismatch somewhere. Are both your Naim and Oppo players hooked up to the Emotiva DAC and then on to the Marantz? Maybe a problem in the chain/s. I am no techy but just a thought.