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Re: Maggie IIIa 3-way Active Crossover Project (long)

Posted by andyr (M) on February 11, 2004 at 14:52:52

In Reply to: Re: Maggie IIIa 3-way Active Crossover Project (long) posted by akino on February 11, 2004 at 13:58:28:

That's a great idea, Andy. I would think this *should* give you the correct relative sound levels for each driver.

The problem is, though, what frequencies do you use for measuring the levels on each driver? If you feed a 100Hz signal though the base driver, you will get a reading which is almost the maximum which the base driver delivers (due to the LP roll-off curve) - 70Hz would probably be closer - but at 30Hz, the normal bottom-end roll-off of the Maggie base panel has reduced the output, so that's no good for setting relative levels.

In addition, the base driver's frequency range covers the octaves where room dimensions and speaker placements have an affect on the sound?

So, just feeding one frequency through the base driver will probably give you room interaction effects - ie. a peak or a cancellation caused by where in the room the speaker is and where in the room the dB meter is. So you cannot be sure you have the *correct* dB reading!!

Ideally, you should do this out of doors in a field!!

Regards,

Andy

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