Calculating output wattage at 4 ohms

[T.I.K. 10+ year member]

My rubi2500 is only given a rating down to 2 ohms, and I was wondering if there was any way to calculate the amount of watts it would produce at 4ohms.

Click to read more...

 

[trumpet 5,000+ posts]

You'd need to measure the current to know for sure. Since it's 2,500 at 1 Ohm and 1,700 at 2 Ohms it's safe to estimate ~800-1,000W at 4 Ohms. Are you trying to set your gain with a DMM?

 

[T.I.K. 10+ year member]

You'd need to measure the current to know for sure. Since it's 2,500 at 1 Ohm and 1,700 at 2 Ohms it's safe to estimate ~800-1,000W at 4 Ohms. Are you trying to set your gain with a DMM?

I was trying to see if I could use this amp at 4 ohms to safely power a pair of Memphis HPO10's.

I know how to set gains with a DMM, that's not a problem. I just wanted to see if the 4 ohm rating would be close to what I'd want to push those 10's with.

 

[trumpet 5,000+ posts]

I had to look up that sub and I couldn't find official specs, but it seems that amp may be fine with 2 HPO 10s.

 

[T.I.K. 10+ year member]

I had to look up that sub and I couldn't find official specs, but it seems that amp may be fine with 2 HPO 10s.

Yeah, the amp should have plenty of power. I'll be starting a build log sometime in the next two weeks.