Question about high current amps versus "not high current amps"


Recently I read a reply to a post about a certain speaker, and the person who replied typed that (and I am going to paraphrase somewhat) the speaker required a high current amp to perform well and it wasn’t the WPC that was important.

Sorry as I am afraid that these are probably going to be  "audio electrical questions for dummies," but here goes:

I vaguely remember being taught the PIE formula, so I looked it up online for a quick review and if I am understanding it correctly,

P (power/watts) = I (current/amps) x E (electromotive force/voltage) .

My first question would be: if I am understanding that correctly, how can wpc NOT matter since watts are the sum of current x voltage? I mean if you have so many WPC, don’t you then HAVE to have so much current?

My next question would be, if I am understanding PIE correctly, is E/voltage going to be a fixed 110 vac out of the wall, or is that number (E) determined by the transformer (so it would vary by manufacturer) and it is that (different transformers that are used in different amps) going to be the difference between a high and a lower current amp?

Or am I completely off base thinking that P is wpc and P is actually the spec in my owners manual that lists "power consumption as 420 watts operate 10 watts stand by"?

And lastly, what would be an example of a high current amp and what would be an example of a low current amp?

Thanks.

 

immatthewj

Showing 12 responses by thecarpathian

@atmasphere ,

One more quick question:

What do you mean specifically when you say ’output devices’? The amp itself or certain components within the amp?

Thanks

@erik_squires ,

To your weight lifter analogy;

I would liken the weight lifter to the amplifier, the weight he's lifting to the speakers, and the power supply to how much muscle (power reserves) he has.

Theoretically, the more muscle he has (capacitance), the more weight (low impedance speaker) he can lift with minimal strain.

Is this reasonable? I hope so, because now I need an aspirin...

 

"And lastly, what would be an example of a high current amp and what would be an example of a low current amp?

Thanks."

My take;

If you’ve got a bunch of big honkin’ capacitors in your amp, you’ve got a high current amp.

If you don’t, you’ve got a low current amp.

Hope that’s not too highly technical for everyone!😃

@atmasphere ,

I’ve always thought the higher the capacitance reserve an amplifier has, the more amps it can deliver when needed. This isn’t correct?

I read what you wrote, but frankly really didn't understand it!

"In short- its complicated."

For me it sure is!

Thank you for correcting my mistake. You guys are light years ahead of me with this stuff.

@atmasphere

Thanks again.

I don’t know if you get told this often, but I really appreciate that you take the time out from what I’m sure is a full dance card to offer your insight here and to educate.

Now I get why you said it the way you did.

A couple more aspirin and I may have this partially figured out..

That’s it, I’m out of aspirin...

Plus I use a leg press machine, better on your back...

@mclinnguy ,

Not hypothetical ones, that’s reserved specifically for us in the flesh he-men!

😎 💪

@erik_squires ,

Nice and simple, I actually followed along!

So, an amplifier shouldn't even be called an amplifier. Isn't it just a  big fancy switching regulator?