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Strangest Box Material You used or Have Seen?
Strangest Box Material You used or Have Seen?
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Old 29th January 2018, 02:38 AM   #21
Wayne1 is offline Wayne1  United States
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Strangest Box Material You used or Have Seen?
Take a look at Panzerholz
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Old 29th January 2018, 03:03 AM   #22
stephenmarklay is offline stephenmarklay  United States
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Originally Posted by planet10 View Post
If one is careful with the bracing, and one gets into a situation wher ethe panel resonantes (rare with music on my boxes) as long as the 2 subpanels are out of phase there is little output.

Constained damping works. But costs time & money. And if my cabinets don’t resonant then i see little point in guilding the lily.

Another trick is to load woofers in tightly coupled push-push so as to take advantage of active vibration cancelation… one gets dramatically lower box load. KEF does this in their Blades. As do a number of other makers.

dave
Thanks Dave. Have you done some accelerometer measurements on different techniques you employed? That is something I would like to play with.

I understand you have a commercial product so tinkering is not just a hobby for you.

I can get away with screwing around and not have to worry about the bottom line
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Old 29th January 2018, 03:08 AM   #23
planet10 is offline planet10  Canada
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Strangest Box Material You used or Have Seen?
I have an accelerometer but i find a mechanics stehoscope more useful.

dave
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Old 29th January 2018, 03:10 AM   #24
stephenmarklay is offline stephenmarklay  United States
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Originally Posted by Wayne1 View Post
Take a look at Panzerholz
That looks interesting
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Old 29th January 2018, 04:00 AM   #25
adason is offline adason  United States
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I have built subwoofer our of concrete. Its still in use by my brother for 30+ years...

Built small boxes out of plaster reinforced by wire mesh. Nothing special.

Made lots of speakers from foam core ready board, layered together with gorilla glue, works great.

Made square box for midrange out of bathroom tiles, worked great.

Rest is usual stuff, ikea cutting boards, small aquarium, birdhouse, all sorts of pipes and sonotubes, you name it.

Last edited by adason; 29th January 2018 at 04:18 AM.
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Old 29th January 2018, 04:15 AM   #26
scottjoplin is offline scottjoplin  Wales
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Originally Posted by Wayne1 View Post
Take a look at Panzerholz
That stuff is amazing
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Old 29th January 2018, 03:20 PM   #27
stephenmarklay is offline stephenmarklay  United States
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I have an accelerometer but i find a mechanics stehoscope more useful.

dave

Cool and thank you for the tip!
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Old 29th January 2018, 03:21 PM   #28
stephenmarklay is offline stephenmarklay  United States
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Quote:
Originally Posted by adason View Post
I have built subwoofer our of concrete. Its still in use by my brother for 30+ years...

Built small boxes out of plaster reinforced by wire mesh. Nothing special.

Made lots of speakers from foam core ready board, layered together with gorilla glue, works great.

Made square box for midrange out of bathroom tiles, worked great.

Rest is usual stuff, ikea cutting boards, small aquarium, birdhouse, all sorts of pipes and sonotubes, you name it.

Cool! Way to break the mld
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Old 29th January 2018, 03:49 PM   #29
Octavia is offline Octavia  United States
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I agree with Dave's comments. Just makes so much sense to move the speaker basket vibration away to the rear panel. We once did a very "ear opening" exercise by epoxying thick ply to the back of a mid woof and running a bolt to the back panel. Was shocking how much of an improvement it made vs the normal screw attachment to the front baffle.
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Old 29th January 2018, 04:50 PM   #30
stephenmarklay is offline stephenmarklay  United States
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Originally Posted by stephenmarklay View Post
Cool! Way to break the mld
Quote:
Originally Posted by Octavia View Post
I agree with Dave's comments. Just makes so much sense to move the speaker basket vibration away to the rear panel. We once did a very "ear opening" exercise by epoxying thick ply to the back of a mid woof and running a bolt to the back panel. Was shocking how much of an improvement it made vs the normal screw attachment to the front baffle.

I may do this next go around. I would try a viscoelastic coupling though. It will transfer some energy to the back panel but it will be attenuated.
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