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Originally Posted by el_duderino
How much more efficient is the Rainbow midbass than the OEM midbass?
It has to be at least 3dB more efficient if it's going to make up the difference between 4 ohm and 2 ohm power delivery.
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About 2dB.
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So you use the OEM tweeter highpass crossovers? On top of the OEM active filter? What's the resultant slope on that? Are there attenuating resistors in the passive network?
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The factory amp crossover remains in place since, well, we're using the OEM amp. In addition, we use passive crossover networks AND attenuating resistors in line on our tweeters. The resistors provide the volume match, the crossover networks provide upgradability.
Ken (our Ken) asked for clarification on this information to better answer the original poster's question, and I guess the info got lost in translation.
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And you're saying that the OEM system needs more highs? Is there a rolloff on the OEM drivers, or are they too quiet in general?
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MOST customers want a slight boost in upper end frequency response and the SLIGHTLY lower impedance of the tweeter/resistor comb gives that. The new tweeter's not quite as efficient as the OEM unit, so the net effect is small, but it's there.