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post #1 of 11 Old 07-15-2019, 11:26 AM - Thread Starter
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Anyone know what this is?

The material seperating the tweeters? On my DIY center channel Im thinking of adding something to help with reflections on the top and bottom pieces of bare mdf. Its 6 speakers, and the speakers are recessed concave-ly-ish(yep i said it), 2 about 2.5-3" and 2 about 1.5", and 2 less than that.

Thats a M&K speaker if anyone couldnt tell.
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post #2 of 11 Old 07-15-2019, 12:08 PM
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It’s similar to the foam inserts used on certain Raal tweeters.

It helps control dispersion.

Leave it at 8 ohms and call it a day :)
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post #3 of 11 Old 07-15-2019, 12:22 PM
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I think they are simply SPACERS that help to keep the "grill cloth" (or whatever M&K uses) from damaging the delicate tweeter when inquisitive little fingers "look" for the source of that great sound. Note that it makes little sense to try to limit the extreme ELEVATION response. Also note that they are NOT used in their current series of speakers:
https://www.mksoundus.com/collections/speakers-1

PS: THIS is what happened to my DIY Center Speakers when my grand-kid's inquisitive little fingers "looked" for the source of MY great sound:

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post #4 of 11 Old 07-15-2019, 12:22 PM - Thread Starter
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Quote:
Originally Posted by Russdawg1 View Post
It’s similar to the foam inserts used on certain Raal tweeters.

It helps control dispersion.
Thanks, where would you buy it?

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post #5 of 11 Old 07-15-2019, 12:29 PM
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Quote:
Originally Posted by trilkb View Post
Thanks, where would you buy it?

Usually they aren’t commonly sold as generic pieces. I don’t know of any other brand of tweeter that uses these other than the MK you just posted and Raal.

This is because they are made to do a specific job for that specific tweeter. I’m sure you could just buy some foam and cut some yourself as they are just simple shapes lol.

What exactly are you trying to accomplish with these?

Leave it at 8 ohms and call it a day :)
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post #6 of 11 Old 07-15-2019, 12:57 PM - Thread Starter
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The center channel I built has bare MDF top and bottom and some speakers recessed. I just bought a 96pack of 10x10x2" acoustic foam pieces to put all over on my wall to help with sound reflection instead of the black sheets. But since the speakers are recessed im curious if I should try anything to help sound bouncing off the MDF before it leaves the box. BTW, wired to 12ohm this center speaker is still the best thing Ive heard, even over the Fusion 10 pures I had. the depth of voices is insane. I was watching Tom Cruise "The Mummy" yesterday and Russel Crowes voice was vibrating my ottoman, and that was before I realized I forgot to turn the subwoofers on!
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post #7 of 11 Old 07-15-2019, 01:16 PM
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Quote:
Originally Posted by trilkb View Post
The center channel I built has bare MDF top and bottom and some speakers recessed. I just bought a 96pack of 10x10x2" acoustic foam pieces to put all over on my wall to help with sound reflection instead of the black sheets. But since the speakers are recessed im curious if I should try anything to help sound bouncing off the MDF before it leaves the box. BTW, wired to 12ohm this center speaker is still the best thing Ive heard, even over the Fusion 10 pures I had. the depth of voices is insane. I was watching Tom Cruise "The Mummy" yesterday and Russel Crowes voice was vibrating my ottoman, and that was before I realized I forgot to turn the subwoofers on!

Is that the Bill Fitzmaurice center?

I heard it’s amazing.

I don’t think you’ll see any improvement with foam inserts, as Bill probably would have thought of this when making the design.

You are welcome to try though, do let me know how it goes.

Leave it at 8 ohms and call it a day :)
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post #8 of 11 Old 07-15-2019, 05:55 PM - Thread Starter
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It's based off of his but mine uses 6 Boston acoustic cr6 speakers. They are rear ported so I left the back open. Have 2 cr8s on the way for left and rights to better match the center over the arc speakers.

I may just put fleece there for now.

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post #9 of 11 Old 07-15-2019, 06:35 PM
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@hol l-ands

have you tried the "vacuum cleaner' dust cover restoration trick?


If the foam were to dampen off axis output,
wouldn't the horn have been shaped accordingly?

while different drivers than BFM specifies for his SLA,
comparative off-axis response charts would be informative
it just may be that extreme off axis output is not a significant factor in a cleaner/ better sound stage . . .
Let's just say, Bill doesn't seem to address that issue
related-ly, what do you have for primary room treatments?

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post #10 of 11 Old 07-15-2019, 07:20 PM
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Quote:
Originally Posted by Russdawg1 View Post
It helps control dispersion.

Can reduce diffraction (though only vertical in this case) by absorbing the high-angle sound that finds its way to edges.

Noah
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post #11 of 11 Old 07-15-2019, 07:51 PM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
@hol l-ands

have you tried the "vacuum cleaner' dust cover restoration trick?


If the foam were to dampen off axis output,
wouldn't the horn have been shaped accordingly?

while different drivers than BFM specifies for his SLA,
comparative off-axis response charts would be informative
it just may be that extreme off axis output is not a significant factor in a cleaner/ better sound stage . . .
Let's just say, Bill doesn't seem to address that issue
related-ly, what do you have for primary room treatments?
I have 6 24x48x2 oc703 panels on my walls, carpet, fleece everywhere (ceilings and walls). In my center channel build thread I did measurements. It works well.

We all know speakers do better on the edge of a shelf and not pushed back, I was thinking of that when asking if I should try something on my box

- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -

Last edited by trilkb; 07-15-2019 at 07:55 PM.
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