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Midrange experiment with Auto sound panel deadener and high density acoustic felt..
Midrange experiment with Auto sound panel deadener and high density acoustic felt..
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Old 27th September 2020, 06:55 PM   #1
Remlab is offline Remlab  United States
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Default Midrange experiment with Auto sound panel deadener and high density acoustic felt..

Boy, that took a while. Around 60 individually cut pieces per box, and filled to the brim. It’s so full that the drivers actually sit Securely at the height they’ll be mounted at, and the felt continues all the way to the back of the speaker. The baffle will be made from two layers of 1/4” maple, with a central layer of sorbothane, and mounted to the speaker with sorbothane gaskets. crossover points will be 500hz and 2.5khz
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File Type: jpeg EFD35034-0027-44A5-A296-00C9D249006D.jpeg (107.5 KB, 1220 views)
File Type: jpeg 489C77EF-0FFB-4E75-9710-BDB93893F4FB.jpeg (74.4 KB, 1209 views)
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Last edited by Remlab; 27th September 2020 at 07:23 PM.
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Old 27th September 2020, 07:23 PM   #2
ga77a is offline ga77a  United Kingdom
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so how does it sound ?
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Old 27th September 2020, 07:32 PM   #3
Remlab is offline Remlab  United States
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The baffles are yet to be made (The baffle parts haven't arrived yet) , but measurements will come in a couple weeks
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Old 27th September 2020, 09:19 PM   #4
Remlab is offline Remlab  United States
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Drivers being used. The spec sheet states 84db on the mids, but they have been consistently measured by several users at around 87db, which is a much more usable efficiency rating. It actually makes sense because all of the other Peerless HDS drivers using this motor measure around 87 to 88db. Anyway, as you can see, it's extremely pistonic within it's operating range.
Attached Files
File Type: pdf 830881.pdf (81.4 KB, 65 views)
File Type: pdf d2608-913000.pdf (237.7 KB, 34 views)
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Old 28th September 2020, 05:44 AM   #5
pop4richard is offline pop4richard  New Zealand
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What are you using for the bass driver?
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Old 28th September 2020, 04:18 PM   #6
Remlab is offline Remlab  United States
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All peerless HDS based system(Not the midrange and tweeter you see here), Actually, the subs are Peerless XXLS but have the same cosmetics.
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File Type: jpg 8774861A-7E87-44BE-BD4A-1E9DF83D3C10.jpg (798.7 KB, 1088 views)
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Old 28th September 2020, 08:41 PM   #7
Remlab is offline Remlab  United States
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I actually love what's on top right now, but I had these other things sitting around, so what the hell, I may as well see if I can outdo it. The Scanspeak 10f/8424 needs a little more EQ in it's passband than I'm comfortable with. I'd like to see if I can get a flatter midband response without the tweeking from my current project. I may also go with two layers of 1/4" aluminum plate with a constrained layer of Sorbothane instead of the maple I wrote about earlier, because the 1/4" maple just wont be rigid enough for what I'm trying to achieve
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Old 28th September 2020, 09:33 PM   #8
Remlab is offline Remlab  United States
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Just bit the bullet. Four, 1/4" aluminum plates, 7" x 11" for the baffle.
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Old 6th October 2020, 03:06 PM   #9
Remlab is offline Remlab  United States
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Nice tight fit. Now it’s time to ‘machine’ the plates.
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File Type: jpg 4610FE87-9D14-43D3-BB3E-E7AB0C3DB354.jpg (382.9 KB, 952 views)
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Old 6th October 2020, 03:13 PM   #10
Remlab is offline Remlab  United States
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I have two more 1/8” aluminum Top plates coming(Equal to the outer dimensions of the speaker), so with the sorbothane, each baffle will be four layers and 3/4” thick.
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Last edited by Remlab; 6th October 2020 at 03:17 PM.
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