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Old 23rd November 2009, 04:17 PM   #1
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Default 2 Drivers to enhance low freequencies?

I have a question about multiple drivers and producing low freequencies.

Lets say I have 1 Driver that has an effective range of 60hz - 300hz. at 60hz it plays -3db. If I took a 2nd driver of the same type and set a 2nd order low pass filter at 50 hz its natural roll off would be -3db at around 60hz. So if I allowed driver 1 to just play with no hpf on it, and add a 2nd driver with a lpf of 50hz would that allow the sound to go down to around 40hz at -3db? Or would it not work that well?
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Old 23rd November 2009, 04:37 PM   #2
badman is offline badman  United States
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Pretty common approach but you have to be careful with 2nd order filter- make sure you don't wind up cancelling rather than reinforcing
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Old 23rd November 2009, 04:39 PM   #3
Glowbug is offline Glowbug  United States
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Why not use a dedicated subwoofer instead of the same midbass that's covering 60-300?
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Old 23rd November 2009, 04:50 PM   #4
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The same driver again is a .5 way system, where a 2-way speaker, with an extra mid/bass added, XO somewhere low to help with bass would be a 2.5 way system.

Go for it - you'll learn more from your own experience than from us telling you.
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Old 23rd November 2009, 09:13 PM   #5
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The reason I want to go this rout is for space, and making it all look hidden. I think I will just try it and see. I really am curious about learning how to get it all to work. Is there anything I should keep in mind when looking at the 2nd order x-over to avoid frequency cancellation?

Also, if I take 2 full range speakers (L & R) can I take the outputs from the LPF of both, and play both into the 1 bass speaker, or would I need some diods to keep the 2 outputs from conflicting?

I'm designing to build a very small sound bar. Thats why its all small stuff.
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Old 23rd November 2009, 09:47 PM   #6
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Only things that occurs to my mind are the terms "Isobaric" and "2nd Harmonic distortion reduction"
Bye
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Old 23rd November 2009, 10:09 PM   #7
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If you are connecting it passive no it won't get you any more extension.
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Old 24th November 2009, 12:24 AM   #8
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OH, so it would need a seperate amp not setup as a x-over on the same channel?
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Old 24th November 2009, 11:01 AM   #9
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It will need more signal than the other driver in order to achieve any extension, the only real way of doing this is to power it by another amp.
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Old 24th November 2009, 12:43 PM   #10
Glowbug is offline Glowbug  United States
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Quote:
I'm designing to build a very small sound bar. Thats why its all small stuff.
You're running up against Hoffman's Iron Law here. Small enclosure size, efficiency, low frequency extension. Pick two
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