James W. Johnson
Screenwriter
- Joined
- May 26, 2001
- Messages
- 1,055
Yeah I know that specs generally mean nothing or at least not much but still I have to wonder how broad the UL rules are for listing these specs.
I know for a fact that Denon and Harman Kardon list the maximum current draw at the rated output for their receivers. The 7200 uses a max of 1050 watts and the Denon 5800 uses 12amps , 120v x 12 amps is 1440 watts.
On the other hand Yamaha does not say how they come up with their wattage rating , they simply have on the RX-Z1 "Power consumption 650watts"
Now what do we know about the Z1 and 5800? Hard evidence by Sound and Vision is this:
The Denon 5800 is rated at 170x7 and S&V measured it to put out 138x5/118x7 with all channels driven with .05% distortion.
The Yamaha RX-Z1 is rated at 130x6 and S&V measured it at
117x5/109x6 with all channels driven and a very low .015%
distortion.
How much power does the Denon put out at .015% distortion? I'd wager that these two amps are fairly similar if you were shooting to keep the distortion figures the same.
Yet the Denon uses 1440 watts and the Yamaha uses 650watts , so either they have a very broad range for rating their receivers or these two designs are very different. Perhaps Yamaha's amp is indeed nearly 3x more efficient then the Denon?
I know these are just ratings and should be disregarded for the most part but I would like to know a little bit on how these companies come up with these numbers.
Anyone care to comment?
I know for a fact that Denon and Harman Kardon list the maximum current draw at the rated output for their receivers. The 7200 uses a max of 1050 watts and the Denon 5800 uses 12amps , 120v x 12 amps is 1440 watts.
On the other hand Yamaha does not say how they come up with their wattage rating , they simply have on the RX-Z1 "Power consumption 650watts"
Now what do we know about the Z1 and 5800? Hard evidence by Sound and Vision is this:
The Denon 5800 is rated at 170x7 and S&V measured it to put out 138x5/118x7 with all channels driven with .05% distortion.
The Yamaha RX-Z1 is rated at 130x6 and S&V measured it at
117x5/109x6 with all channels driven and a very low .015%
distortion.
How much power does the Denon put out at .015% distortion? I'd wager that these two amps are fairly similar if you were shooting to keep the distortion figures the same.
Yet the Denon uses 1440 watts and the Yamaha uses 650watts , so either they have a very broad range for rating their receivers or these two designs are very different. Perhaps Yamaha's amp is indeed nearly 3x more efficient then the Denon?
I know these are just ratings and should be disregarded for the most part but I would like to know a little bit on how these companies come up with these numbers.
Anyone care to comment?