# Question about Ohms

• 01-22-2013
brooklynjoy2008
If I take a 3000 watt amp that does rated @1 ohm 14.4. Set it correctly to 1500 rms @1 ohm. Then set it correctly to 1500 @ .5 ohm. Would there be a difference? Like if I took a saz1500 and set it to [email protected] .25 would there be a difference from 1 ohm? And this is in a situation where your electrical can handle 1000-1500. Or do you take losses from your equipment by running them at a lower impedance, but not trying to take more from the amp? This is a hypothetical question to better understand this hobby.
• 01-22-2013
hispls
Re: Question about Ohms
Gain will need to be adjusted when you change the load. Keep in mind impedance is dynamic and your 1 ohm nominal load may or may not ever even show 1 ohm load to the amp when it's playing music, and if it does it will only be at 1 frequency.
• 01-22-2013
brooklynjoy2008
Re: Question about Ohms
Quote:

Originally Posted by hispls
Gain will need to be adjusted when you change the load. Keep in mind impedance is dynamic and your 1 ohm nominal load may or may not ever even show 1 ohm load to the amp when it's playing music, and if it does it will only be at 1 frequency.

I know I have to reset it. My question is, is there a difference? Would 1000 watts @1 ohm be different than 1000 Watts @ .0625?
• 01-22-2013
brooklynjoy2008
Re: Question about Ohms
What I mean is. As far as the amp is concerned, would that matter given that the amp can handle 1000 rms. For example, an amp that can do [email protected] 4 ohms, then set it to 1000 @ 1 ohm. Would the amp be less efficient, and working harder?
• 01-22-2013
Chriszle
Re: Question about Ohms
it is harder on your amp to run it at lower impedance. The amp gets hotter.
• 01-22-2013
hispls
Re: Question about Ohms
Quote:

Originally Posted by brooklynjoy2008
What I mean is. As far as the amp is concerned, would that matter given that the amp can handle 1000 rms. For example, an amp that can do [email protected] 4 ohms, then set it to 1000 @ 1 ohm. Would the amp be less efficient, and working harder?

Yes, running lower impedance is much more stressful on the amp and loses efficiency. If you half the impedance, your MOSFETs are doing 4X as much work.