Originally Posted by sdilley14
As far as power goes, there won't really be a noticeable difference between the 95 watts per channel the 673 is putting out as opposed to the 115 watts per channel the 475 puts out? I don't have any intentions of going the full 7.1, keeping it at 5 channels.
I don't think you're comparing apples to apples here. The 673 has more power than the 475. From the Yamaha website for the 475:
Rated Output Power (1kHz, 1ch driven) 115W (8ohms, 0.9% THD)
Rated Output Power (20Hz-20kHz, 2ch driven) 80W (8ohms, 0.09% THD)
Dynamic Power per Channel (8/6/4/2 ohms) 110/130/160/180W
And for the 673:
Rated Output Power (1kHz, 2ch driven) 105W (8ohms, 0.9% THD)
Rated Output Power (20Hz-20kHz, 2ch driven) 90W (8ohms, 0.09% THD)
Dynamic Power per Channel (8/6/4/2 ohms) 130/170/200/240W
The middle one in both cases is the more telling. Notice that for the first line the 475 is rated with 1 channel driven, while the 673 is rated with 2 channels driven. The 20Hz-20kHz, 2 channels driven spec is a more suitable comparison. Sometimes marketing and big box advertising blur these things together.
Either way, the power difference won't really translate into an audible difference, but it will add some headroom for the 673.