Mark Lanctot;187321 Wrote: > Isn't it supposed to run hot though? > > There may be problems putting it into a confined space with little or > no ventilation.
It get a little warm, though it's not that hot. I believe it will generate a lot less heat than a conventional class A/B amp, because it's much more efficient. It also has A/B speaker outputs. I'm pretty sure you can set the relative volume output to them too, though there's no independent real-time volume control. Skunk Wrote: > In a lame attempt to get back on topic, the $30 t amp is a low to high > level converter :-) Yeah, there's no amplifier in there, though the unit as a whole is arguably an amplifier, at least at an abstract, black-box, level. As I understand it, internally the T-amp is at some level an ADC connected to a DAC with speaker level outputs, where the digital intermediate signal is a form of PWM. The Panasonic and its ilk, on the other hand, with digital input, I think is not an amplifier in -any- sense (in spite of it having the word on the front). It takes digital bits, manipulates them, and directly generates speaker level analog output from it. There's no point when a small wiggle is made into a big one. Unless you could call a relay, switch, or DAC an amplifier... In my shaky understanding that's the -theoretical- benefit of digital amps. They take a pulse width modulation, where a signal level of 30% is presented as a single bit signal that's high for 30% of the time, and then apply a low pass filter to get an analog signal with a 30% level. Thus a simple digital stream plus a low pass filter sidesteps all the ugly quirks of a solid state transistor amplifier. Voilà, perfect sound ;). ahem. What I don't understand though (ok, I don't understand most of it), is how they do it without an extremely high clock frequency. To get the pulse codes to encode 16 bits @ 44.1kHz, I'd have thought that you'd need a PWM clock 44100 * 65535 Hz, or about 3GHz, and they don't. They use, I believe, 384kHz, and claim that can output 192kHz sound, which would be an appropriate clock for PCM, not PWM. If my simplistic understanding were right, the amp would theoretically only be able to output 3 bit resolution at 44.1kHz output, and so would surely sound rubbish. It doesn't, so there's a lot going on that I don't understand. That's not news :). -- jimmyfergus ------------------------------------------------------------------------ jimmyfergus's Profile: http://forums.slimdevices.com/member.php?userid=4323 View this thread: http://forums.slimdevices.com/showthread.php?t=33112
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