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[chainenoble]

how do they make this speaker work?with what i read about comb effects,this speaker should sound like crap.but, there are other speakers out there with 2 dome tweeters,like dynaudio.does anyone know how they do this,or is it that comb effects are minor and not that noticeable.can anybody explain

[Stormrider]

You're right, bad comb filtering would be present in these speakers designs. 'Smooth', 'dull', or 'lack of air' are probably how non-technical people would describe them. Some people may even like that sound, and thats why they sell. Not something you'd want to strive for in a design, unless i'm missing some other factor.

[69stingray]

You can always just do the math and see where the combing will occur. If I recall, the freq. response has a dip at 1/2 wavelength of the distance different. If the difference in the distance from two drivers is 1”, then the first “dip” will be at 1/2 the wavelength of 1”. The remaining dips will be at odd-harmonics.

Lets assume the top tweeter is at ear height. The center of the second tweeter is 8” below that. The listener is 36” away. The difference in distance from the listener is 0.87”, which has a freq. of ~15,611 Hz. The first dip will be at ~7,805 Hz, the second at ~23,415 Hz.

For the woofers, I think the dips from comb filtering is outside their freq. range (above the low-pass crossover).

Also, it is my understanding dips are less noticeable this spikes in the response. If they are narrow enough, I wonder if they are audible. Maybe they add a time-delay circuit to prevent the combing.

It is late for me, hope I got this right and is logical.

[sreten]

Hi,

You can always roll off the bottom of a pair earlier than the top.
Still for tweeters that size spacing too much over most of the range.

3 good drivers are better than 6 average drivers.

/sreten.