A good pasive preamp would do this and have a better volume control than the Oppo.
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This box does exactly what you need, is expensive and has a distinct high end look to it.
If it is any good I cannot tell, but I would expect no audible degration from the box itself. In a real high end system you will hear some loss from the extra pair of cables. An alternative would be to ditch the sony, get a preamp with a true bypass (not unity gain), and run the Oppo through the bypass.