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Ok so i am not exactly comftorble yet with understanding ohms. let me run something briefly by you

so, amps do not have any say about what ohms a load is when a speaker is connect. only speakers determine it? right?

so a 8ohm speaker connected to 1 channel of a 2 channel amp is 8 ohms
a 8ohm speaker bridged to an amp 2 channels bridged to 1, is not 4 ohms, its still 8ohms right?

two 8ohm speakers p'ld to a bridged amp is 4ohm cuz they are p'ld but not 2ohm eeven though bridged right?

Also, if i know what the power of an amp is at 4ohm how do i know wht it will be at 2? like if it says 400w @ 4om. what would that be at 2. thankyou

 
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Yep, the impedance is only determined by the speaker. I don't know if you've taken any basic electricity in physics or whaver, but think of impedence as resistance [technically, impedence is for alternating current, like sound waves and resistance is for direct current].

You can think of the power output as being inversely proportional to the impedence. If your speaker is 8 ohms, and your amp puts out 100 watts at 8 ohms, if you connected a 4 ohm to the amplifier it should theoretically double the power output.

Don't worry about bridged and stereo, just look at the specs that the amplifier has. If it doesn't say it's stable at 2 ohms, don't connect a 2 ohm speaker to it.

 
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Just about everything you'd want to know is available here: http://www.bcae1.com/

 
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I read through that site. I'm just asking for simplification though. heres my example, you can answer it.

3 ohm sub.
2 channel amp.
amp says stable at 1ohm, stereo. 2ohm mono.

is the 3ohm sub connected to the bridged amp creating 3ohm load, or a 1.5ohm load. will this work.

 
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One 3 ohm sub is always 3 ohms, it never changes. Bridging an amp does nothing to ohms, but it does change what ohms the amp is capable of handling.

If it was a 3 ohm DVC sub, then it can act like:
1) Two separate 3 ohm subs
2) One 1.5 ohm sub (parallel wiring)
3) One 6 ohm sub (series wiring)

The thing with amps are when you bridge it, then usually the ohms it can handle changes. Generally in bridged mode it can only handle higher ohm loads, usually double the ohms of the lowest stereo rating.

If your 2 channel amp is 4 ohm stable only, then it most likely will only be 8 ohms stable when bridged (4 ohm stable x2 = 8 ohms bridged). If its a 2 ohm stable amp, then it most likely will only be 4 ohms stable when bridged (2 ohm stable x2 = 4 ohms bridged).

Most any amps currently produced are typically 2 ohm stable, but only 4 ohms when bridged.

 
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^^^ didnt actually answer his question, but yes it should be ok. If you have a dual voice coil sub or if you have two subs that are both 3ohms then your amp would see a 1.5ohm load into 1 channel. The amp says 2ohms x 1 but just dont crank your gains way up and i think you should be ok. Worst case scenario is that the amp will overheat. You'll notice this because it will either gradually get quieter or will shut off and then turn back on. If it does either of these then just switch how you have it wired.

If you only have one 3 ohm single voice coil sub or if you have 2 dual voice coil subs wired in series/paralell your amp will see a 3ohm load x 1channel which will be fine.