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      11-24-2012, 01:38 PM   #10
taibanl
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Drives: BMW
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Yes, your theory is wrong.

Generally amps put more wattage in to a lower resistance (like the XD which puts 100w (rated) into 2 ohms but 75w into 4 ohms) generally its linear.

However the HD series have switched voltage rails. In which case, as you posted it will put out 500W at anything between 1-4 ohms. If you take two 2 ohm speakers your options are a 1 ohm load (parallel wiring) or a 4 ohm load (series wiring). Result=500w.
For loads above 4 ohms, it follows the conventional wisdom. So two 4 ohm drivers in series would be 250w.

Now...

If you have decided for the XD, i would get the 2 ohm drivers to get a bit extra power out of it.