Time for another DIY Speaker project

Marantz offers at HiFiMART.com

keith_correa

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Another option for glue, which I found out with the help of the owner of the above website is: https://mccoymart.com/buy/essr-bond-ms-40-600ml-high-modulus-sealant/
(I have a bottle of this glue in hand but yet to try out in an actual build) It is supposed to have similar properties as Weicon Flex.
Brilliant, this! Thanks much!

The author of the above website has found through an extensive set of experiments that such a CLD construction (along with appropriate cabinet inner wall lining and driver mounting methods all given in website) significantly reduces panel resonances in the midrange band and can make audible differences in performance.
In the build the mid is open back so not sure how much of a +ve impact the CLD will have. If you are in touch with "augerpro" - can you ask him if he thinks it's worth going the CLD route with an open back mid? :p

Complicated stuff this and may be beyond my capability. Any pointers who could do this in Mumbai?
Were you going to build the box yourself?
 
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Vineethkumar01

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In the build the mid is open back so not sure how much of a +ve impact the CLD will have. If you are in touch with "augerpro" - can you ask him if he thinks it's worth going the CLD route with an open back mid? :p
Sorry, I didn't know that an open back mid is used in this project.
In my 3 way study build thread on diyaudio, augerpro has given many good suggestions so far. :)
I will ask him about what he thinks about using CLD when an open back mid is used.

Thanks
Vineeth
 

captrajesh

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If you are in touch with "augerpro" - can you ask him if he thinks it's worth going the CLD route with an open back mid?
What's open back mid? In this design, mid-woofer has its own enclosure I think. Correct me if I'm wrong.
Were you going to build the box yourself?
No. Someone else will do it sitting far away. Getting it done remotely by explaining is the complicated part. If someone is available locally, it can be done moch more easily I guess.
I will ask him about what he thinks about using CLD when an open back mid is used.
All inputs are welcome.
 
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Vineethkumar01

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This was Augerpro's reply when I asked whether a CLD box and/or CLD bracing scheme has any use in a project like this one with open back mids.

"I think there would still be benefit. Even if the woofer operates below the primary panel resonances, and the mid is open, they both still transmit energy to the panels through the driver frame so the box panels will still re-radiate that energy if nothing is done about it."
 

Kannan

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The mid has its own enclosure but that enclosure is open at the back (no back wall).
This prima facie does not seem to be a good approach.
If the rear of the mids opens into the main enclosure, then the back waves of the woofer will hit on the mid's cones and impact the sound.
I would suggest putting the mids in a fully sealed enclosure within the main enclosure.
 

Vineethkumar01

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This prima facie does not seem to be a good approach.
If the rear of the mids opens into the main enclosure, then the back waves of the woofer will hit on the mid's cones and impact the sound.
I would suggest putting the mids in a fully sealed enclosure within the main enclosure.
HI
I don't think the mid enclosure opens to the woofer enclosure in these type of designs. Rather it opens to the outside of the speaker cabinet.
For absorbing the back waves of the mids, probably a back-open mid cabinet with certain dimensions filled with absorption material maybe used (instead of a typical closed box filled with stuffing). Jim Holtz and Curt Campbell probably know reallywell what they are doing :p:D

Here is a link to enclosure construction details:

Here is a thread about a build of this particular speaker:

Thanks
Vineeth
 

keith_correa

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HI
I don't think the mid enclosure opens to the woofer enclosure in these type of designs. Rather it opens to the outside of the speaker cabinet.
Yes, the mid enclosure extends all the way to the back of the cabinet and is open at the back of the larger cabinet enclosure.
Jim Holtz and Curt Campbell probably know reallywell what they are doing :p:D
They certainly do!

The mid enclosure could be sealed too but that would affect the voicing and probably wouldn't be the "Statements" any more.

This is fine and essentially an open baffle design.
Not really. The mid enclosure is tuned to be a Transmission Line.
 
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captrajesh

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"I think there would still be benefit. Even if the woofer operates below the primary panel resonances, and the mid is open, they both still transmit energy to the panels through the driver frame so the box panels will still re-radiate that energy if nothing is done about it."
Thought as much. Sounds logical as well. Does the midrange tunnel needs to be of CLD as well?
For absorbing the back waves of the mids, probably a back-open mid cabinet with certain dimensions filled with absorption material maybe used
There are no details as to what damping material and how much to use.
 

Vineethkumar01

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Thought as much. Sounds logical as well. Does the midrange tunnel needs to be of CLD as well?

There are no details as to what damping material and how much to use.
Please take a look at this thread that I posted above.
Jim Holtz mentions some details regarding the damping material there, specifically in post number 28.

I think there is no harm in making the mid tunnels CLD as well, if possible. The idea is to dampen panel resonances, whose effects are more noticeable in the frequency range of 300 Hz to roughly 1500 Hz.

In a 3 way with a closed box mid, there could additional layer of absorption/ dissipation of energy due to the outer bigger box.

When I asked a similar question to Augerpro regarding my project, he told the full cabinet in a 3 way (with a closed-box mid though) could be made CLD. It is his opinion and he has not tested it specifically for 3 way speakers. I too have not tested all the above yet.

But in this case, since it is an open back mid and smaller box sizes, more audible effects maybe perceived my proper tuning using damping material in the mid tunnel.
 
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keith_correa

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There are no details as to what damping material and how much to use.
Please read the two floor standing Statements writeup too and don't limit your reading just to the Monitor writeup because the Monitors are an evolution of the floorstanders. It will give you more insight and reveal things that one/you may have assumed and will prevent much heartache later especially for the cabinet etc. From the floor standing Statements writeup, I quote:
"The transmission line enclosures are lined with 1" foam with the foam held back about 1 ½" or scalloped from the back of the W4 drivers."
This holds good for the Monitor too!
 
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