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      05-15-2011, 09:24 PM   #2
ctuna
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Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

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I don't know what technology the old amp is

But I would be guessing its a class AB amp as it was released in 06.
The newer amps are full range class D which means they can be much smaller
due to switching technology in the amp itself.
Much more power is packed in a much smaller package .
Do a search on the two technologies there are some trade offs.

The original HI Fi amp is rated at 25 per channel for the doors and 40 for the floors. (at 2 ohms)
I have read the Alpine is 85 per channel rms at 4 ohms.

A better substitute for the HI FI is the JL XD 600/6 as it has 6 channels but the speakers
should be upgraded to take the new power.

Last edited by ctuna; 05-15-2011 at 09:30 PM..
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