Ohm -The unit of electric resistance and impedance. One ohm is the resistance value through which one volt will maintain a current of one ampere.
Ohm's Law - Current in a circuit is directly proportional to the voltage, and inversely proportional to resistance.It also includes the relationships of watts to amps, volts and ohms.
as your ohm load decreases, power from your amplifier will increase. because there is less resistence. heres an old one amp @ 8 ohms puts out 25 watts amp @ 4 ohms puts out 50 watts amp @ 2 ohms puts out 100 watts amp @ 1 ohms puts out 200 watts amp @.5 ohms puts out 400 watts amp @.25 ohms puts out....who'm i kiddin, usually smokes by now
so... if you have an amp that says it is 1000 watts at 2 ohms, but you hook up a 4ohm woofer to it....it will only put out 500 watts