if i have two 4 ohm subs and connect them parallel, would they each be 2 ohms then??

Question

i need any advice on ohms, when it comes to subs and amps...what does 200 watts rms x 2 @ 2 ohms mean?? what can i do with that?

Answer 1

If you have two 4-ohm subs and connect them in parallel to the same amplifier channel, each sub will still be 4 ohms. The combined load at the amplifier will be 2 ohms. The power produced by the amplifier will be split evenly between the two subs.

With a 2-channel amp and two 4-ohm subs, you won't be able to use the 2-ohm output of the amp. Your best option is to connect one sub to each channel for a 4-ohm load.

The ohm rating is a measurement of how much the subwoofer resists the power running through it. A higher rating means more resistance. An amplifier can produce more power when the resistance is low than when the resistance is high. Therefore, amplifiers will usually have different power ratings when they're connected to different ohm loads: an amp rated at 200 watts into 2 channels at 2 ohms may only be rated for 100 watts into 2 channels at 4 ohms. The only way to change the resistance (the actual term is "impedance") for the amplifier is to change the impedance or the number of speakers connected to it.

When you connect two subwoofers in parallel, it creates a lower impedance for the amplifier even though each individual sub's impedance stays the same. Think of the amplifier as a big tank of water, and the subwoofers as water pipes. When you connect a water pipe to the tank, water starts flowing out. The amount of water flowing is determined by the thickness (impedance) of the pipe: a thicker pipe allows more water (power) to flow. A narrow pipe has a higher impedance and results in less water flowing. When you add a second pipe, it doesn't change the amount of water running through the first pipe. However, there will be twice as much water flowing out of the tank.

A good starting place for learning about car audio is this web site: http://www.bcae1.com

Answer 2

o.k. heres the thing ohms is a measure of speaker impedance, nothing more nothing less... the ohms mentioned in amp specs means when your speakers are configured like this... then the amp will provide that amount of power. a amp canot create a different load. so when a amp says 200watts x 2 @ 2 ohms that means that amp can provide 200 watts to two independant 2 ohms speakers. in your case you have 2 sperate 4 ohms subs, which if hooked up in parrelel would create a single 2 ohm load not two seperate 2 ohm loads. you cant change the load of each. . the amp rating and sub ratings you mentioned above do not match. if you have two 4 ohm subs that amp, likely you would have to hook it up in stereo which would only give about 100 watts to each sub.
If you bridged the amp it is only stable to 4 ohms, so it could run one of the two subs with 200 watts to 1 sub, but cannot power both, because that would be a 2 ohm load. in series 2 subs would be a 8 ohm load and each sub would only get 50 watts. Look at the link i provided to see some sub wiring options. understand your amp would have to "support" thoses ohm ratings, if the ohms are two low for your amp it will shut down, or potentially even fry.

Answer 3

No, in basic terms a million, 4, or sixteen. Now, in case you degree the voice coils with a meter, its in no way even. So, 4 ohm subs would meter out at 3.5 ohms, a 2 ohm sub would meter at a million.7 ohms, and so on. yet no, you incredibly cant get a 2 ohm load from a pair of twin 4 ohm subs, sorry.

Answer 4

200 watts rms x 2 @ 2 ohms means theres 200 watts of continuous power being produced from an amp on two channels with an impedence of 2 ohms. Depending on how many voice coils your subs have your choices for wiring are as follows:

Single voice coil:
http://www.crutchfield.com/learningcenter/car/subwoofers_wiring.html?suboptions=2%2DChannel%5F2%2D4ohm%2DSVC&type=2%2DChannel

Dual voice coil:
http://www.crutchfield.com/learningcenter/car/subwoofers_wiring.html?suboptions=2%2DChannel%5F2%2D4ohm%2DDVC&type=2%2DChannel

Answer 5

Correct, if you were to connect them in series, that would make 8 ohms :)