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Old 26th March 2007, 12:50 PM   #1
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Default Making ELF/EAS work lower

By lower, I don't mean the bottom end but the top end. I want to build an ELF/EAS sub that would match up with my OB woofers that go down to around 27hz.

I've read Rod Elliot's article several times but still don't understand how to achieve what I want. Any advice please?
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Old 26th March 2007, 01:04 PM   #2
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This is one of the things I dislike about EAS, you have to change the box size to change the crossover frequency. Increasing size lowers the frequency.
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Old 26th March 2007, 01:06 PM   #3
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Call me psychic Richie but I just knew you were going to reply!

So I would have to make a bigger box to get lower which sort of removes the advantage of the ELF design. Oh well, back to the drawing board as they.
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Old 26th March 2007, 01:40 PM   #4
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Or you could use a Linkwitz Transform and low-pass filter...
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Old 26th March 2007, 02:18 PM   #5
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Or you can add two resitors to the ELF and a lowpass.

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Old 26th March 2007, 03:33 PM   #6
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Thanks Charles.

Just to clarify, do you mean that by adding the two resistors, I can make the lp filte? Or that I must make an lp filter and then add two resistors? If the latter where do I add the resistors?
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Old 26th March 2007, 03:39 PM   #7
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I was tryng to work out what he meant. I think he means add resistors to the integrators (in series with the existing caps) to give a shelving action at the present crossover frequency, then add a low-pass filter.
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Old 26th March 2007, 03:41 PM   #8
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I'd just build a low pass feeding a LT personally.

What's the in room roll off of the OBs?
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Old 26th March 2007, 03:42 PM   #9
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Quote:
I was tryng to work out what he meant. I think he means add resistors to the integrators (in series with the existing caps) to give a shelving action at the present crossover frequency, then add a low-pass filter.
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Old 26th March 2007, 03:53 PM   #10
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Quote:
I'd just build a low pass feeding a LT personally.
It LT is actually TL then that won't be small PM!

Quote:
What's the in room roll off of the OBs?
I haven't actually measured it but I would guess around 27-30 hz.
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