EveryCircuit - 10 watt RMS audio amplifier

10 years ago

Very high THD% :P

rich11292000

10 years ago

How does a company advertise 1500 watts rms and 1000 watts peak. These arnt exact values, but I'm not getting how rms exceeds a peak value. Is this advertising catches like Maxwell super capacitors. Digital amp. The rating is for 1 ohm subwoofer, from product comparison a couple years ago. I didn't get that amp I got a cheapo that didn't have overload protection so it technical was 1 ohms stable for 15 minutes until the thermal protection was triggered.

UncleRick

10 years ago

When you are talking watts, I believe peak watts is double rms watts. So that 1500 should have been 3000 peak. Then... You can come across an old one called Music Power. That one was higher than RMS & lower than peak. It was determined based upon the power supply capacitors and how much they could supply (instantaneously) above what the power supply could supply continuously. That was for loud drum hits and other rapid draws of power like that. I don't think it is used anymore because ppl were being confused by it and because it just isn't needed with the state of the art, these days.

UncleRick

10 years ago

Geese... I just looked at it. That must be close to 100% THD! A square wave, and not even a good square wave. That puts a LOT of power to the coils with little (good) sound to show for it. Can you say "blown speakers"?

rich11292000

10 years ago

Well these subwoofer amps for cars have similar ratings that are all proportional until they get to 1 ohm. Then the rating is what ever. Example: 4 ohm speaker gets 250 rms and 1000 peak, 2 ohm speaker gets 500 rms and 1000 peak. 1 ohm speaker gets anywhere from 750 rms to 1500 rms. So never knew how to compare the proportions when it gets down to 1 ohm as far as overzealous manufacturer specifications.

barron

10 years ago

That spec seams to be saying 1500rms at first then as it heats up it proportionally deduces output to maintain cooling. The part's maybe able to pass the amps but the cooling is inadequate to maintain that output level indefinitely so as heat goes up power out goes down.

UncleRick

10 years ago

It sounds like we are talking about two different sorts of "peak". The peak that I was talking about is like RMS AC volts & peak to peak volts. They are the same value. The same with RMS watts & (2 x RMS)= Peak watts. They are the same value just with a different rating term. But it sounds like you guys are referring to "peak" as in peak being "the most it can put out". A peak amount. Those two "peak" terms are not the same meaning. Is this the situation?

UncleRick

10 years ago

The RMS value of a sine wave of peak X is (1/√2)*X or 2 to 1. But they are both the same value, simply a different term/rating for the same level of amplitude/value. All of this is using a sine wave. Complicated waveforms is whole different animal. (Lots more complicated math involved.)

rich11292000

10 years ago

I thought i was talking about peak with rms but the actual rating for 'peak watts' is maximum watts in a short time frame. while 'rms watts' is continuous watts in a long time frame.

UncleRick

10 years ago

No. You are talking about "Music Power". That is how much power can be supplied for a very short amount of time, depending on the power supply reserve. A matter of a second or so. Peak watts and RMS watts are the same amount of power, referred to with different terms. Like 1 mile vs 1.6 kilometers is the same distance, referred to by different terms. It is just a calculated value. The formula is listed above & that formula is right out of the books. AND ONLY when a sine wave is used. No hard feelings I hope. :-)

UncleRick

10 years ago

I would hate to have spent nearly 40 years doing it all wrong. :-(