You need to list the whole system. The other components may play a factor. Also list exactly how everything is connected.
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I was thinking that you may have a combo of a very efficient speaker and a high gain source, or maybe even using a phono preamp by mistake. Given that you have no phono input and your speakers are anything but efficient, I'm not sure what the problem is. You may have a problem with your amp. Try using a different input on your amp, and also a different source. The Oppo by itself, without the DAC will be OK for a different source.