1. ## difference in power output of amp at different voltages, what to expect?

Hi, all, I have a couple questions about the watts rms differences that amps put out at different operating voltages? I was looking at specs on some of my amps, and some are rated at 12.5v and 14.4v.
My mtx 250x is rated 25 watts rms at 12.5volts while my coustic amp is rated at 45 watts rms at 14.4 volts.
How much power % wise is typically lost going from 14.4 volts to 12.5 or vice versa how much power is gained by going to the 14.4 voltage (if there is anyway to really compare). I am just trying to get an idea of how to better rate/compare the amps that I have.
Thanks for all the help!
SHawn

2. ## Re: difference in power output of amp at different voltages, what to expect?

This is a really hard question to answer because different amps will repsond differently to an increase in power from 12.5 to 14.4 volts. Is there anyone that can help him?

3. ## Re: difference in power output of amp at different voltages, what to expect?

Hey, thanks for the fast reply! I figured that this might be a hard question to give a general answer to. I have looked around the net for more info but havnt really found anything. Thanks for helping out.

4. ## Re: difference in power output of amp at different voltages, what to expect?

lol your welcome. If I had to guess you can usually expect about a 15-25% increase in power if I just had to guess what you could expect. But im not really sure. Sorry I couldnt be of more help though.

5. ## Re: difference in power output of amp at different voltages, what to expect?

You would have to know how well regulated the amps in question are. Based on MTX's ratings I would say they aren't considered regulated amps so you're going to get a pretty good power rise with a higher voltage supply, and I would assume the same with Coustic.

However, it's important to realize that the difference in power between 12.5 and 14.4V is probably going to be 20, MAYBE 30% which is a minor enough change that any audible difference would be pretty slight, possibly undetectable.

On the other hand, if you have a regulated amp. Such as the ones I use - with typical voltage fluctuation the output of the amp will change so little there is no possible way to hear a difference. As long as my amps are getting enough voltage to stay powered on their output won't fluctuate by more than 10%, and there is virtually NO change from 12.8-14V.

Plus - as long as your car is running and you have a sufficient charging system your voltage shouldn't be dropping below about 13.5v anyway - and the difference from there to 14.4v certainly wouldn't be enough to hear.

Basically - if you're wanting more power - get a bigger amp. It's really not worth the trouble of trying to maintain 14+V at all times.

6. ## Re: difference in power output of amp at different voltages, what to expect?

its true, overkill is your friend

7. ## Re: difference in power output of amp at different voltages, what to expect?

thanks guys. I am not worried about trying to maintain 14.4 volts. I was just trying to get an idea of how my amps would compare with each other if they were tested at the same voltage. It looks as if they would be pretty close to one another.
Thanks again
Shawn

8. ## Re: difference in power output of amp at different voltages, what to expect?

so if someone were to have the hifonics bx1500d which is rated 1500 watts @ 14.4 it most likely be much less at around 13 volts?

9. ## Re: difference in power output of amp at different voltages, what to expect?

That's less than a 10% voltage fluctuation. You'd never hear a thing.

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