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Old 12-08-2009, 05:22 PM   #4
Propeller Head
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Join Date: Jan 2008
Location: Toronto
Posts: 283

The H/K 6x9s are 2 ohms, if memory serves, which is what the BMW H/K amp is expecting to see. Your typical aftermarket car speakers are 4 ohms impedance.

If you hook up a 4 ohm speaker to your H/K amp, with the doubled impedance, your speaker will only see about 12-15 watts of clean (less than 5% THD) power from the amp, so it really doesn't matter what you pop back there- they will be running at well below their power capacity.

As for audio quality, these are rear fill speakers, and the amp has a built-in cross-over which will send the woofers ONLY mid/ low frequencies. You need therefore be concerned with only three things; efficiency (how loud they go for a given amount of input), size (you need a 6x9), and cost (as little as possible).
'97 M3

SOLD- Now Enjoying Honda Civic
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