How can I tell?

[aussiek2000 10+ year member]

I have some off brand subwoofer amp. I used the gain setting formula to run it at 400wrms @ 2 ohms. It only has a 25 amp fuse though, which leads me to believe that it is not putting out enough power. How can I tell how many watts it is really putting out using a DMM? Theoretically, what is the max power it can put out @ 2 ohms with that 25 amp fuse?

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[JimJ 5,000+ posts]

You can't, using only a DMM...you also need an RMS clamp meter to measure current.

 

[Megalomaniac 5,000+ posts]

I have some off brand subwoofer amp. I used the gain setting formula to run it at 400wrms @ 2 ohms. It only has a 25 amp fuse though, which leads me to believe that it is not putting out enough power. How can I tell how many watts it is really putting out using a DMM? Theoretically, what is the max power it can put out @ 2 ohms with that 25 amp fuse?

25amps x 14.4v = 360 watts at maximum(100%) efficiency

To answer your question bluntly, sh!t aint making 400 watts

 

[aussiek2000 10+ year member]

So can I just turn the gain up until it doesn't get any louder?

 

[Megalomaniac 5,000+ posts]

What? the amp cant make the power, it wont get louder, it will start clipping, and it will sound nasty, if tries to make more power, you will blow fuse(s)

 

[shaneb 10+ year member]

What? the amp cant make the power, it wont get louder, it will start clipping, and it will sound nasty, if tries to make more power, you will blow fuse(s)

Hey could just throw a bigger fuse in it //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif