Understanding Ohms (audio)

[jpsimm]

Originally Posted by Jrew

I am confused as to whether or not i should purchase a subwoofer with a 4 ohm impedance or a 2 ohm impedance. I understand the basic concept of wattage in relation to ohms, however which will deliver the best sound quality/spl? Also, if i am understanding this correctly a dual coil sub can be wired in parallel/series? fill me in on your audio knowledge!

This kind of "ohms" is different than the kind you just add up like in a battery circuit. They are to be considered as "units of compatibility" as in "coupling" circuits together. input or output. If you put a 8 ohm speaker, for instance, on a 4 ohm audio output there will be a mis-match resulting in reflected audio power back to the amplifier where it translates to heat and eventual damage.

No matter the equipment be sure to match the values of "impedance" for best performance. And, yes there are devices which can match up otherwise uncompatible equipment but they reduce effeciency a bit. Stay away from them if you want a good boomer.

In your question above you need to see what the output impedance of the amplifier is then buy a woofer of the same value for proper operation. Any other value will result in the reflected power scenario as I described above.