Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
Hah, well that is a bold statement ;-)
Hah, well that is a bold statement ;-)
Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
- Thread starter Mark DeArman
- Start date
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
Why do you say that?
Why do you say that?
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
I saw them on a tripod with the horn asymmettrically placed, and he says it's a 60x60 degree horn. Doesn't spell frontfill to me at all.
I saw them on a tripod with the horn asymmettrically placed, and he says it's a 60x60 degree horn. Doesn't spell frontfill to me at all.
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
What I'm not getting here is using an efficient 400w driver for a very narrow band and a less efficient 200 w driver for everything up to that narrow band. Even crossing it half an octave lower it will handle system power of 2KW, so why limit the box by such a weak bottom woofer?
What I'm not getting here is using an efficient 400w driver for a very narrow band and a less efficient 200 w driver for everything up to that narrow band. Even crossing it half an octave lower it will handle system power of 2KW, so why limit the box by such a weak bottom woofer?
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
Well,
1) The NTR08 was all that I had laying around which was Neo. Same goes for all the components actually.
2) Whether it is true or not, the NTR08 and MDN51 have the same rated power handling as per the AES2 test.
3) As shown in the drawing of the crossover topology, a few posts back up, both the 8in drivers cover the low band. The outside 8in, which I am calling the LF driver, is crossed over way lower than the inside MF driver. The MF driver has a lattice filter to compensate for the phase difference between the MF and LF drivers.
Well,
1) The NTR08 was all that I had laying around which was Neo. Same goes for all the components actually.
2) Whether it is true or not, the NTR08 and MDN51 have the same rated power handling as per the AES2 test.
3) As shown in the drawing of the crossover topology, a few posts back up, both the 8in drivers cover the low band. The outside 8in, which I am calling the LF driver, is crossed over way lower than the inside MF driver. The MF driver has a lattice filter to compensate for the phase difference between the MF and LF drivers.
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
I, like Per, had thought that by 3 way you meant the mid 8" was not covering any of the same passband as the lower 8", hence the confusion and his question.
Obviously that was just a misunderstanding which you've now cleared up, making the driver choice and XO points much more understandable now, thanks
~~:smile:
Cheers,
David.
I, like Per, had thought that by 3 way you meant the mid 8" was not covering any of the same passband as the lower 8", hence the confusion and his question.
Obviously that was just a misunderstanding which you've now cleared up, making the driver choice and XO points much more understandable now, thanks
~~:smile:Cheers,
David.
Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
Totally get the design now, you are cutting the outer element just before you get any lobbing and interference (probably could go a bit lower unless the filter is extremely steep)
Sort of suspected that, I guess you'll be using identical elements in the finished product.
Just had a quick look, one seemed to be 400W and the other 200W, didn't look closer than that, (but thought that a 200W speaker with a 4.5 dB sensitivity seemed a waste of money :twisted: ) Anyway, even for testing purposes, will not the lower sensitivity of the Celestion (looks like more than 3 dB in most of the band they work together) affect the results you get?
OK, I misinterpreted this sentence: .
and couldn't get my head round the crossover. Not being able to recognize anything but the simplest design, I found it impossible to tell what was resistors and what was the actual load, and therefore didn't move on to try to figure out what the filter actually did :blush:
Totally get the design now, you are cutting the outer element just before you get any lobbing and interference (probably could go a bit lower unless the filter is extremely steep)
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Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
Here's the annotated network drawing.
Of course, it's not exactly right but would get someone started if they wanted to try the same thing. It really takes a good measurement system and experimentation to make the right value choices and the correct order for the x-over sections. The lattice network is balanced so that L1=L2 and C1=C2.
If you were going to DSP the passive I would leave out the pad circuits. The HF notch depending on the horn choice might be better implemented as an series tank on the HF leg only, instead of the parallel tank in series with the whole network.
Here's the annotated network drawing.
Of course, it's not exactly right but would get someone started if they wanted to try the same thing. It really takes a good measurement system and experimentation to make the right value choices and the correct order for the x-over sections. The lattice network is balanced so that L1=L2 and C1=C2.
If you were going to DSP the passive I would leave out the pad circuits. The HF notch depending on the horn choice might be better implemented as an series tank on the HF leg only, instead of the parallel tank in series with the whole network.
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Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box
It does if you turn it on its side. What am I missing here?
It does if you turn it on its side. What am I missing here?