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Old 21st January 2003, 11:36 PM   #1
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Default is two full range drivers in one baffle a problem?

If you mount two small full-range drivers like the Fostex FE103 virtically in a narrow baffle, will it sound worse than just one? Meaning if one sounds good, will two sound the same, just louder? Or can adding the second one screw up the imaging? If so, how can you tell what kind of spacing (like D'Appalito) there should be between the drivers so as to not screw up the imaging?
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Old 21st January 2003, 11:54 PM   #2
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Default Re: is two full range drivers in one baffle a problem?

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Originally posted by bbaker6212
If you mount two small full-range drivers like the Fostex FE103 virtically in a narrow baffle, will it sound worse than just one? Meaning if one sounds good, will two sound the same, just louder? Or can adding the second one screw up the imaging? If so, how can you tell what kind of spacing (like D'Appalito) there should be between the drivers so as to not screw up the imaging?
Hey baffle-man

The answer is, in theory, yes. At some frequency related to the distance between the 2 drivers the HF will start to add & cancel. An MTM XOs the 2 mid basses low enuff low enuff to avoid this. With 2 FE103s as close as possible this is in the 4-6k region.

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Old 22nd January 2003, 12:06 AM   #3
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Default 1.5-way

One could slap a low-pass on the bottom wide-range driver, and thus make the speaker a 1.5-way.
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Old 22nd January 2003, 12:09 AM   #4
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Any way to remove or reduce this problem? Stagger the drivers with their centers not virtically alligned? Place them side-by-side?
Firing at different slightly different angles?
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Old 22nd January 2003, 12:20 AM   #5
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Quote:
Originally posted by bbaker6212
Any way to remove or reduce this problem? Stagger the drivers with their centers not virtically alligned? Place them side-by-side?
Firing at different slightly different angles?
You can mount them co-axially (quite difficult in 3-space ) or at an angle of at least 90 degrees (and if you are going that far you might as well do it 180 degrees and take advantage of push-push.

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Old 22nd January 2003, 12:45 AM   #6
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Does the cancellations happen in close proximity to the drivers or farther out? Would putting something like neoprene rings on the baffle around the drivers help to reduce this bad effect?
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Old 22nd January 2003, 02:15 AM   #7
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Quote:
Originally posted by bbaker6212
Does the cancellations happen in close proximity to the drivers or farther out? Would putting something like neoprene rings on the baffle around the drivers help to reduce this bad effect?
No

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Old 22nd January 2003, 05:49 AM   #8
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This thread has info and references you might find instructive:
line array with full range drivers?
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Old 22nd January 2003, 06:36 AM   #9
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Default 2 full range etc

Dave,

I always thought that if you have two drivers close together and feed them with the same signal, you can consider them as one driver with a double area. If there is cancellation, why isn't there cancellation with a single driver from signals from different parts of the cone? Or is there, what they call beaming?


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Old 22nd January 2003, 06:52 AM   #10
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Quote:
I always thought that if you have two drivers close together and feed them with the same signal, you can consider them as one driver with a double area. If there is cancellation, why isn't there cancellation with a single driver from signals from different parts of the cone? Or is there, what they call beaming?
Jan,

You could consider them one driver if you could manage to have both drivers exactly the same distance to your ears. However, this is practically impossible, since at higher frequencies, minute pathlength differences will cause cancellation. Slouching just a bit from the optimum seating position will destroy the tonal integrity at these higher frequencies. This is why one tweeter is almost always used, with the other drivers LowPassed.

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