Originally Posted by zoomer
4 ohm. 2 ohm. it is the impedance (a fancy word for resistance that also included inductance and changes with frequency) that the speaker has and what the amp sees. There is a debate as to whether there is any audible difference. Some say that it is easier for an amp to drive 4 ohms. However modern amps are designed to handle 2 or even 1 ohm
It is not a matter of what is better but what you need for your amp. If you will have only 1 sub then you can pic 2 ohms to maximize the output from your amp. If you want 2 subs then teh best may be to get 2 4ohms subs and put them in parallel to make the amp see 2 ohms.
there is a lot of good info on the various car audio sites. just google it and do your homework.
Basically good info, but it's not exactly complete.
Personally I don't see much of a difference audibly, I look at it as being able to match your subs to your amp. If you wire in series (+ on amp to + of sub1, -of sub 1 to + of sub2, -of sub 2 to-of amp
) you will double the value. If you wire in parallel (all + together, all- together) you will halve the value.
If you take a minute and search for rockford fosgate's wiring wizard, it will show pretty pictures for the concepts I described.