power & impeedance

[`daj0pe]

hey all.

What is the difference between running 2 150wrms subs, at 4 ohm at relative power, to running them at 2 ohm?

thanks

[Joe Peeps]

The difference will depend on the amp, which is...?
Generally, most amps will make more power at lower impedances (Ohms law is your friend) Some amps, like the pdx alpines, JL audio from memory. can make the same power at different loads. The trade off is usually higher THD, but you probably wont be able to hear the difference.

What coil configurations do your two woofers have that will allow you to run at either 2 or 4 ohms? You can only present the amp with the load that the impedance of the woofers in the circuit will allow.

Edit: Remember to ensure that your amp is stable at the load you are presenting. most amps arent stable bridged at 2 ohms, and not all monoblocks are 1 ohm stable.

[`daj0pe]

thanks for the help Joe.
Basic scenario,
I have 2 150wrms amps(2 ohm stable), and 2 150wrms subs (4ohm).
From what i understand, i'll get more power, by powering them at 2 ohm off of the 1 amp..

sound right to you?

[Joe Peeps]

Ahh, youve got two amps. Make and model?
Edit: Basically, it depends. The amp might not make 300 at 2 ohms, in which case you may get more power running both amps, but the difference is not worth the hassle of setting up 2 amps. It should say the power output at 2 ohms on the amps spec sheet. more details required for a concrete answer PS if they are two channel amps, you cant run them bridged unless your amp is stable at 2 ohms bridged, which is unlikely.