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I have an mtx mono class d amp that says it can handle:

RMS Power measured at 12.5 Volts DC:
125 Watts x 1 into a 4 Ohm load with less than 1% Thd+N
250 Watts x 1 into a 2 Ohm load with less than 1% Thd+N


Now I have a subwoofer box with 2 10" subwoofers in it (some cheap *** subs that I have sitting around). It also looks like there are tweeters or something on the box. I don't know what brand they are or anything, I just know they are two 10" subs. I would like to test them out on my mtx amp, but am not sure if they will ruin the amp. How can i check if the impedence(ohms) are ok for my amp if I can't find the specifications for the subwoofers?

 
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I'd almost guarantee that both those speakers are 4 ohms each. Wire it in parallel and you get an overall load of 2 ohms. Perfect to get max power out of the amp.

If you really want to check, get an ohm meter and test the coil of each speaker. It should be about 4 ohms.

 
Rep Power: 311

You need to have some sort of idea what the woofers are. Look everywhere for brand name, model numbers etc is the easiest way.