| Nuuk |
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 |
| 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 |
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 |
| Or you could use a Linkwitz Transform and low-pass filter... |
|
|
| phase_accurate |
Or you can add two resitors to the ELF and a lowpass.
Regards
Charles |
|
|
| Nuuk |
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 |
| 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 |
I'd just build a low pass feeding a LT personally. ;)
What's the in room roll off of the OBs? |
|
|
| phase_accurate |
| 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 |
| 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. |
|
|
| richie00boy |
| quote: | Originally posted by Nuuk
It LT is actually TL then that won't be small PM! |
You've lost me there. You wouldn't need to change the box if you Linkwitz Transform. |
|
|
| Nuuk |
| Sorry Richie, I thought PM had got the letters back-to-front and meant transmission line! :cannotbe: |
|
|
| moray james |
| have you considered using a Ripole design? cant get any smaller physically can be single or dual driver and they dont go up too high naturally. Least expensive box on the planet to build. Does it get much better? Regards. |
|
|
| Nuuk |
| quote: | | have you considered using a Ripole design? |
Moray do you mean ripole instead of the OB woofers, or as well?
And how low can you go with a ripole? |
|
|
|
