regalma1;187649 Wrote: > You measure the total power level going in and the total going out. If > the latter is greater than the former there is gain. You have an amp. > The fact that the Panasonic also has a DAC doesn't really change that. > If that was the case then a standard amplifier with a digital input > (feeding a DAC) would not be an amp.
It doesn't "also have a DAC", it -is- a DAC. That is the point. The digital PCM input is converted to a PWM stream in the digital realm, and then the pulses are smoothed out directly for the speaker output. This is definitely an over-simplification, as I originally pointed out, and in fact that was the truly interesting area for discussion. To reiterate: this unit is not a DAC and amplifier integrated into one box. On the contrary, to provide analog inputs, it runs them through an ADC to generate _PCM_ input. In that case it, in composite, forms what is effectively a variant of a class D amp, but with digital conversion into the PWM stream. I can't imagine you're suggesting that, you can compare a digital input power and the output analog, with a higher powered output than input represents gain- that the gain of the Panasonic can be measured in terms of the power of the S/PDIF input vs the speaker output? The issue is that there is nowhere in this amp where you could find an analog signal to compare with the output, to measure gain. That's one indication that this isn't an amp. As I said before, there will be a place where a binary digital signal is turned into another, higher power binary digital signal, but that's never really been considered amplification in the past has it? - that's switching. So, to call these amplifiers, needs a new and very loose interpretation of what an amplifier is, no matter what people's gut feelings may tell them about what it looks like, or the what position it sits in in their hifi cabinet. -- jimmyfergus ------------------------------------------------------------------------ jimmyfergus's Profile: http://forums.slimdevices.com/member.php?userid=4323 View this thread: http://forums.slimdevices.com/showthread.php?t=33112 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
