2ohm vs. 4ohm???

Systems

what is the difference between 2 and 4 ohm, other than the obvious 4 ohm. Is it just a larger amount of signal? Does it give better sound? If i have 4ohm subs and 4 ohm amps will it be fine?

I really jus need some good background info on differences and help with what is 'easier' and what sounds better.

Thanks for any help...

Jezma

Jstas

Some links that may be helpful:

http://clubpolk.polkaudio.com/forum/showthread.php?s=&threadid=10087&highlight=ohm

http://www.the12volt.com/ohm/ohmslaw.asp

http://webhome.idirect.com/~jadams/electronics/ohm.htm

PoweredByDodge

lowering impedance will only allow increased current flow, it will not increase the voltage across the load, which is completely "up to" the "decision" of the amplifier / source unit. current goes up, which makes power go up, but voltage stays the same.

as far as sound quality decreasing, that's something that depends on the setup -- if you buy an amp that is designed for a 2 or even a 1 ohm load (regardless of class), it will perform at its best through that load. buy an amp that's designed for a 4 ohm bridged load, and sure it'll degrade at a lower impedance -- but hell it might blow up before you notice it...

impedances have very little to do with the characteristic sound of the woofer. two dual 4 ohm coil subs (parallelled to 2 ohms each sub) running in parallell (down to a single 1 ohm load) running off a 1 ohm bridged class AB amp that is designed to function at that impedance will not sound of any less quality than two 8 ohm subs parallelled on a 4 ohm bridged AB amp.

damping factor will drop - sometimes drastically, and this is why (again i stress) it is important to buy an amp / sub combination that were "meant for each other". as long as your amp is running within specifications then dont sweat it.

also keep in mind that a 2 channel AB bridged into a 4 ohm load is actually running (sound quality wise / power wise / efficiency wise / damping wise.. yada yada yada) like its in 2 ohm stereo mode.

and since the quality of some off the shelf 2 channel AB's these days tend to look worse and worse, you might as well just run a D at 2 ohms mono because the numbers are going to get pitiful anyway.

however, in the end, putting aside the kind of 2 channel AB's that you can actually run at 1 ohm bridged or 2 ohms bridged and get their top performance level, and putting aside the kind of subs you'd want to run on those amps... then i'd have to agree w/ kim, in general, if you're shopping circuit city / best buy / crutchfield / sounddomain, etc etc... then ya -- for the "creme de le creme" sound quality go with a mid sized 2 channel AB bridged at 4 ohms to a single 4 or dual 2 ohm coil sub... or go with a large 2 channel AB bridged to two single 8 ohm coil subs or two dual 4 ohm coil subs wired to present a 4 ohm load.

Systems

wow thanks alot for all the feedback!
I'm new to car audio, so the info was kinda overwhelming.
But as far as i understood, if i buy subs that are recommended on a particular 2 channel amp then i will be ok, and i can have a play around trying it at 2ohm and bridged at 4.