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Originally Posted by cytokinesis /forum/post/19592470
...You could go nuts and spend a ton of money on a powerful AVR, but when it comes time to replace that unit, either for new features or because it broke, you're going to have to pay that same cost again. Amps, on the other hand, rarely change, and good ones are generally very reliable. This means that when you need a new processor, you don't have to take power into account, and save a little money by opting for cheaper, less powerful models. You also open up the option of buying stand-alone pre processors, though, surprisinglyh, these cost more than receivers. ...
Originally Posted by stegen /forum/post/19592375
On the back of my receiver there are pre-amp outputs (I think thats what they are, im at work now so doing this off of memory), what are those for? also if my receiver puts out 120 watts or so per channel why use amps?
|Originally Posted by MichaelJHuman |
Large towers may be more efficient than small speakers, so I don't think that's a reliable way to think about the problem.
google 'amp power calculator' and punch some numbers in to get an idea of how much power is needed. You will need to know your approximate listening distance from your speakers and speaker sensitivity.
I can play music on my system very loudly while measuring an average (RMS) voltage of 5 volts. At this level it's louder than I would normally listen to it. If the peak to average ratio of the song was 15 dB, I figure I need 5 times the voltage peak, or 25 volts. That would be 78 watt into 8 ohms.