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Post subject: Explain the meanning of the "watts" of guitar amplifiers
Posted: Thu Jan 25, 2018 12:18 am
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Disclaimer: I know nothing about electronics or guitar amps.

(Actually, I do know one thing: that "wattage" is synonymous with "volume" when speaking about guitar amps and since watts are measured on a logarithmic scale, a 100 watt amp is only twice as loud as a 10 watt amp...I think.)

I am very confused.

My question applies to any guitar amp, but as a random example, I will use the Fender Blues Junior III amp.

According to the product description on the official Fender website (and all product descriptions of this amp online), it has 15 watts:

Screenshot:Fender "Blues Junior III" amp production description
Image
But, according to the plate on the back of the amp itself, it has 180 watts:
Image
File:Fender Blues Junior III manufacturer plate

How come there are two different watts numbers with guitar amps? What does each number represent, and how can they both simultaneously represent the amp's "wattage"?


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Post subject: Re: Explain the meanning of the "watts" of guitar amplifiers
Posted: Sat Feb 03, 2018 11:29 pm
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Welcome to the Forum triumph_85. Here is some info https://en.wikipedia.org/wiki/Watt. There are some guitar and amp guru's here. Some one should have an answer for you.

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Post subject: Re: Explain the meanning of the "watts" of guitar amplifiers
Posted: Sat Feb 03, 2018 11:49 pm
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I’m confused. Why was this same question with the same wording posted HERE in 2016?

Why don’t you just read the responses on the other forum? Here, I’ll copy/paste like you did:

“Although both values are in watts, they are referring to two different power quantities. The "15 watts" refers to the audio output power, i.e. the power delivered to the speaker. This is the power that generates the sound that you hear. The "180 watts" listed on the back of the amplifier refers to the power drawn from the AC input line.

Jan 19 '16 at 3:29

Barry”


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