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That said, jean is correct about the preout situation -- but this has always been a pandora's box situation that I have argued for and against in many a thread...here's the scoop: You would think that at a price point like Onkyo's "600 series" of receivers, taking into consideration their relatively low power output specs, that these units would come with preouts as a no-brainer, so the user could add amplification down the road...however, on the flip side of that coin, the company also knows that at this level of the game, not many buyers are even aware of what "external amplification" is or means, nor would they looking to add more power to their systems -- so, in some ways, it makes sense that Onkyo doesn't include this feature in this level of receiver.
But...then again...there ARE enthusiasts like me who wanted to stay within a certain budget who bought a model from the 600 range (in my case, the 605 when it came out) who could now definitely benefit from adding external power but don't have the preouts to do it...in my case, I'd like to keep the processing and features of the 605 and use it as a pre/pro, but add a lot more power to feed my Polk RTi12 mains...but I can't do it with the 605...