How much power you need, depends on how loudly you want to play.
Quote from: KozmoNaut on 05 December, 2017, 03:42:40 AMHow much power you need, depends on how loudly you want to play.Exactly, I actually measured it once and apparently my comfortable level that sounds good is about 2x0.1 watts peak. 100W would be much more than enough.
You don't really need any complex measurement, it's more about estimation:Set suitable volume then play 1kHz full scale, measure RMS voltage.Using nominal impedance is probably accurate enough (it's measured @1kHz, isn't it).
Your suggestion would give a useful estimate, but I would like to be more precise for two reasons...
QuoteYour suggestion would give a useful estimate, but I would like to be more precise for two reasons...Speakers are not measured/specified that way. If your 8-Ohm speaker is rated for 90dB at 1W and 1M, that's based on the nominal rated impedance, with an applied voltage of 2.83V RMS. The actual power consumption may be higher or lower as the impedance changes over the frequency range. And, amplifiers are rated for the nominal impedance.
I am trying to determine how much power I need for a stereo integrative amplifier.
I have heard that it is better to have an amp with lower power that is within clipping than a large amp running at low power. Is there any truth to this?
I also want to use the headphone amp in the integrated amp. Does anyone know how much the impedance is common? I heard that it is around 100 or more ohms. Is that going to be a problem; do I need to get a headphone amp instead?
That is exactly what I said. To calculate the average electric power absorbed in a speaker in the general case,
QuoteThat is exactly what I said. To calculate the average electric power absorbed in a speaker in the general case,It's a speaker not a heater... Nobody cares about the "power absorbed". We want to know how much sound we get out when we connect a 100W amplifier and we don't care if we're getting exactly 100W. And, we want to know if we are going to fry the speaker with a 100W amplifier.
I have a question about high current amplifiers. What makes an amplifier put more power into lower impedance? Why doesn't an amp put more current into a speaker of lower impedance out of its power supply and just run within its power specification, and have less overall volume?