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-   -   Making ELF/EAS work lower (http://www.diyaudio.com/forums/subwoofers/98880-making-elf-eas-work-lower.html)

Nuuk 26th March 2007 12:50 PM

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? :xeye:

richie00boy 26th March 2007 01:04 PM

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.

Nuuk 26th March 2007 01:06 PM

Call me psychic Richie but I just knew you were going to reply! :D

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. ;)

richie00boy 26th March 2007 01:40 PM

Or you could use a Linkwitz Transform and low-pass filter...

phase_accurate 26th March 2007 02:18 PM

Or you can add two resitors to the ELF and a lowpass.

Regards

Charles

Nuuk 26th March 2007 03:33 PM

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?

richie00boy 26th March 2007 03:39 PM

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.

pinkmouse 26th March 2007 03:41 PM

I'd just build a low pass feeding a LT personally. ;)

What's the in room roll off of the OBs?

phase_accurate 26th March 2007 03:42 PM

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.
The candidate has 100 Points !

Regards

Charles

Nuuk 26th March 2007 03:53 PM

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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