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Below is the listed specs of my amplifier but I was hoping I could get some help understanding certain things.

1) What does "Rated Power at X Volts" mean? Is this the amount of power I will get based on the voltage supplied by my car battery? Is it right to assume my amp will be receiving something between 12.0 - 14.4 volts?

2) What determines which impedance (2 or 4 ohms) my amp will encounter when powering speakers? Is it simply the speaker? Speaker descriptions usually say " XX watts at X ohms". So if a speaker says it has 2 ohm impedance, is that the impedance my amplifier will see?

Thanks a lot for the help.




Rated Power at 12.0 Volts:

* Five Channel (4 ohms): 40 watts x 4 + 130 watts x 1 (20 Hz-20 kHz, 0.05% THD) + (20 Hz-200 Hz, 0.5% THD)
* Five Channel (2 ohms): 60 watts x 4 + 200 watts x 1 (1 kHz, 0.5% THD) + (100 Hz, 0.8% THD)

Rated Power at 14.4 Volts:

* Five Channel (4 ohms): 60 watts x 4 + 200 watts x 1 (20 Hz-20 kHz, 0.05% THD) + (20-200 Hz, 0.5% THD)
* Five Channel (2 ohms): 80 watts x 4 + 300 watts x 1 (1kHz, 0.5%THD) + (100 Hz, 0.8% THD)
* Three Channel (4 ohms bridged): 160 watts x 2 + 200 watts x 1 (1 kHz, 0.5% THD) + (100 Hz, 0.5% THD)

 
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Watts = volts * amps
you are correct in saying the amp will see between 12-14.4 volts. In most situations itll be around 12.6.

The impedence on the speaker is how much resistance they give. The lower the resistance the amp sees, the more power can flow to the speakers. You can wire a two 4 Ohm speakers down to 2 Ohms by wiring them in parallel, aka on the same wire from the same amp terminal. You can also wire two 2 Ohm speakers down to 1 Ohm in parrallel.