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Old 10th October 2012, 07:35 PM   #181
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Quote:
Originally Posted by Rullknufs View Post
But a wider baffle reduces imaging?
Could you please explain why a wide baffle reduces imaging. If it is due to diffraction from the edge, then rounding the edges and asymmetric placement of the FR driver on the baffle, with a mirror image for the second speaker can minimize ill effects of diffraction.
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Old 10th October 2012, 07:38 PM   #182
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Originally Posted by planet10 View Post

Now when we did the MTM with EL166 we did all those things you suggest. XO was much simplier and could be passive. About the same XO point as Tysen.

dave
Thanks Dave.
So if a passive crossover is chosen for the Tysen design, would it be better to mount the woofer on the front baffle....unless of course if WAF is of greater consideration than coherence !! Toeing in is perhaps always a good idea with most speakers (wide or narrow front baffle) anyway , to widen the sweet spot.

Last edited by soundaatma; 10th October 2012 at 07:53 PM.
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Old 10th October 2012, 07:58 PM   #183
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Quote:
Originally Posted by soundaatma View Post
Could you please explain why a wide baffle reduces imaging. If it is due to diffraction from the edge, then rounding the edges and asymmetric placement of the FR driver on the baffle, with a mirror image for the second speaker can minimize ill effects of diffraction.
I'm sorry but I can't explainy why. It's just something I have heard elsewhere on the Internet. It might even be false, I don't know.
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Old 10th October 2012, 10:03 PM   #184
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Quote:
Originally Posted by soundaatma View Post
Thanks Dave.
So if a passive crossover is chosen for the Tysen design, would it be better to mount the woofer on the front baffle....unless of course if WAF is of greater consideration than coherence !! Toeing in is perhaps always a good idea with most speakers (wide or narrow front baffle) anyway , to widen the sweet spot.
WAF was a big consideration. The woofer used is not really efficient enuff to be passively XOed. And if you moved the woofer to the front it would no longer be Tysen.

If i find myself with sufficient number of left over SDX7 we may do an MTM with the new FF85wk.

dave
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Old 10th October 2012, 10:05 PM   #185
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Quote:
Originally Posted by soundaatma View Post
Could you please explain why a wide baffle reduces imaging. If it is due to diffraction from the edge, then rounding the edges and asymmetric placement of the FR driver on the baffle, with a mirror image for the second speaker can minimize ill effects of diffraction.
The key word there is minimize. And to truly minimize the round over should be on the order of 1/4th the total box width (or more). A skinny baffle usually gives better imaging. A skinny baffle with a big roundover/champher is even better.
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Old 11th October 2012, 03:53 AM   #186
JZatopa is offline JZatopa  United States
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IMO Imaging would be further improved if you placed the fullrange driver in a sphere. The problem is finding a simple way to build a sphere or finding a sphere that will work. The best I have found in my searches has been a pair of IKEA salad bowls.
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Old 3rd December 2012, 04:54 AM   #187
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Here is a visualization of the next iteration of "Tysen", with the new FF85wk augmented by an ML-TL with 2 Peerless 4"
After a successful test run at last diyFEST with a set of mules + my uFonkenSET and a PLLXO, we (Chris) built a dedicated set for working on a passive XO (a work in progress).

Click the image to open in full size.

We haven't stopped there. This teaser got some interest when posted (somewhere on the multi-way forum).

Click the image to open in full size.

Chris got the cabinets to the test phase, i need to finish the matching FF85 , but here is one with the drivers loose in the box.

Click the image to open in full size.

We are also working on an Alpair 7 with a pair of SDX7.

dave
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Old 3rd December 2012, 05:08 AM   #188
zman01 is offline zman01  Bangladesh
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Cool Dave!

The 3 drivers all have seperate chambers within the enclosure? Or is the FF85WK in a small chamber within the larger box for the woofs (which would be sharing the space)?

Alpair 7 with SDX7 sounds even more exciting. But isn't the SDX7 also on the "nearly gone and no more production" list?

- Zia
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Old 3rd December 2012, 05:35 AM   #189
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... is the FF85WK in a small chamber within the larger box for the woofs (which would be sharing the space)?
Yes. FF85 in a TL exiting out the back.

Quote:
Alpair 7 with SDX7 sounds even more exciting. But isn't the SDX7 also on the "nearly gone and no more production" list?
The original copper MA cone colour (in the A5, then the A7/12, then A10.2 and A6m) was intended to be a match for the phase plugs in the SDX7.

Someone had to do this before it wasn't possible (we will be using copper A7)

THis one is also significant in that the enclosure will be a bit different (shape & construction). Chris & i are keeping details & pictures until done.

dave
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Old 7th December 2012, 08:39 PM   #190
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Holy cow! What woofers are you running in that trapezoidal cabinet? I guess I missed the post in the multi-way forum.

KM
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