4ohm vs 2ohm

[Jacobman 10+ year member]

Here is my situation, I am getting a system for my car. This includes a new deck which i have decided on the Kenwood Excelon KDC-X589 and 2 front speakers which would be the Alpine SPS-130A's. I am wanting 2 12" Alpine type-r's but i have too small of an amp to power them, the Phoenix gold M25. I would like to buy 1 sub and later on getting another sub and bigger amp, but i was told for some reason you cant have onle 1 4ohm sub. If your getting 1 sub then it must be 2ohms and getting 2 then they must be 4ohms. Why cant you just get 1 4ohm sub?

If that is the case then should i just get the 2ohm one and when im ready to upgrade getting 2 4ohm subs, a new amp and then selling the 2ohm and amp on eaby or something?

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[bri487 5,000+ posts]

get whatever configuration of subs that you amp put the most power out at.

ex: if your amp put out the most power at two ohms, you want a single two ohm speaker or dual four ohm.

for more help use the woofer wiring wizard on rockford fosgates site under tech support.

 

[skmfkr 5,000+ posts]

just get an amp that puts out about 1200-1500wrms @1ohm and about 600-1000@2ohms, so when you have one sub you can wire it to 2ohms and when you had the second sub. it will be 1ohm

 

[Jacobman 10+ year member]

I cant get an amp on my budget, I can only get one sub. So should it be a 2ohm one or 4 ohm one. But i do believe the amp puts out the most out of 1x2ohm.

 

[skmfkr 5,000+ posts]

dvc4 wired to 2ohms then

 

[Jacobman 10+ year member]

dvc4 wired to 2ohms then

Whoa! That just went way over my head, lol. Does that mean the 2ohm sub then?

 

[foddercom 10+ year member]

Dual 4 ohm voice coils; 2 voice coils that each have an impedence of 4 ohm, wire the sub in parallel with the amp and it will go down to 2 ohms.