You want some links to reputable sources?
You are all ears, and eyes?
Watch this:
And stop the nonsense of comparing musical instruments to loudspeakers.
That guy?
Unfortunatly you have to know more than him when he misses stuff or repeats untrue generalizations. Some stuff is solid but you have to pick them out.
Suck in everything. There will be truths imbedded with misleading or incorrect information. You have to sift, keep an open mind, see what makes sense, experiment.
dave
Unfortunatly you have to know more than him when he misses stuff or repeats untrue generalizations. Some stuff is solid but you have to pick them out.
Suck in everything. There will be truths imbedded with misleading or incorrect information. You have to sift, keep an open mind, see what makes sense, experiment.
dave
Here is a discussion that started 2007 on the subject. Much solid information and solid debate.
https://www.diyaudio.com/community/...hat-materials-to-build-speakers-out-of.98834/
dave
https://www.diyaudio.com/community/...hat-materials-to-build-speakers-out-of.98834/
dave
My point is this is just that, a hobby, I am citing facts from real world experience using pallets and pallets of materials, ordered directly from mills, not just working in my garage.
Have you had “premium materials” come apart where they shouldn’t have on the router table, or even a table saw? I have.
Do you even know how they are made?
Sorry gramps, not teaching me much🙂
Attachments
The golden rule of watching youtube experts.
Unfortunately, when the content creators are 95% right we let our guard down and start quoting them; sometimes with the 5%.
I might give this a try in future builds:
Steve
ABOUT BAMBOO PLYWOOD
Bamboo plywood is a strong building material that has become one of the most important alternatives to hardwoods. Thanks to the fast re-growth of plants, Bamboo plywood is a sustainable, renewable resource. Engineered Bamboo can be divided into two main groups; laminated bamboo and strand woven bamboo. To construct laminated bamboo, strips are glued and heat-pressing so the pattern and characteristics of the bamboo nodes are clearly visible. For strand woven bamboo, the strips are turned into strands and then pressed together. This displays a varied patterned appearanceSteve
Stranded is the best, vertical us what most use, avoid horizontal.
It only needs a clear coat to look fantastic, and tricks can be done with care on the dados.
dave
It only needs a clear coat to look fantastic, and tricks can be done with care on the dados.
dave
Ah, well I'm just a drooling hobbyist who don't know much about mass production...of course I did spend 40 years working as an automotive engineer but, y'know, that can't be nuthin' compared to the complexity of your gig. When workpieces "come apart" during fabrication it's more often an issue of inadequate fixturing, poorly maintained tooling, feeds and speeds not appropriate or well controlled, trying to remove more in a pass than is appropriate and safe and so forth. If you are truly sourcing premium material and having issues safely machining it perhaps you need the to consult someone knowledgeable in the field of production engineering. Just because you've shoved pallets of wood past a router bit or table saw blade don't mean you are following best practices kiddo!
Sorry buddy, not going to get into details, but I can assure you that I wasn’t running a router. And my composites experience exceeds farther than you are implying, some of that experience included supplying Lamborghini with equipment and processes, who care, right? I don’t care if you made washing machines or whatever either.
There’s a reason that ultrasonic testing has been used for decades in the manufacturing of plywood.
To each their own!
There’s a reason that ultrasonic testing has been used for decades in the manufacturing of plywood.
To each their own!
Calm down, I did this, you did that - who cares! How about some positive input into the subject?
Anybody tried to determine speaker enclosure resonance with impedance measurements? If so please describe procedure.
Steve
Anybody tried to determine speaker enclosure resonance with impedance measurements? If so please describe procedure.
Steve
Measure the impedance,look for bumps. They may be an enclosure resonance.
A mechanics stethescope is a goto toll for finding resonances.
dave
A mechanics stethescope is a goto toll for finding resonances.
dave
Interesting. You’d have to be good with joinery. Two thin peices of veneer+3 ply plywood, sandwiching a damping layer.
Alot would depend on how good the ply is and how effective the damping layer is.
dave
Alot would depend on how good the ply is and how effective the damping layer is.
dave
You could simply stick LDPE or PU foam to act as a damper?
Use sticker glue, that works.
Easier than laminating thin pieces of ply, which could warp over time.
Use sticker glue, that works.
Easier than laminating thin pieces of ply, which could warp over time.
Interesting project /article about using an accelerometer for speaker box testing
https://sound-au.com/project181.htm
Steve
https://sound-au.com/project181.htm
Steve
Dave,
Have you read augerpro’s Monster construction methods thread or summary at his soma sonus website?
after viewing that in entirety; as of Feb 2022, it’s not entirely clear whether plywood is absolutely better than MDF.
At the same thickness: I’ve concluded that it resonates differently.
In fact, It looks like constrained layer damping improves things over regular plywood. I wonder then. whether, is this the multi-layering that is improving things.
Revel’s Ultima 2 series speakers use 9 layer MDF.
Now that’s a lot of work for the DIYer, but not impossible, but I wonder whether ply-MDF Is better than ply-wood.
Have you read augerpro’s Monster construction methods thread or summary at his soma sonus website?
after viewing that in entirety; as of Feb 2022, it’s not entirely clear whether plywood is absolutely better than MDF.
At the same thickness: I’ve concluded that it resonates differently.
In fact, It looks like constrained layer damping improves things over regular plywood. I wonder then. whether, is this the multi-layering that is improving things.
Revel’s Ultima 2 series speakers use 9 layer MDF.
Now that’s a lot of work for the DIYer, but not impossible, but I wonder whether ply-MDF Is better than ply-wood.
Seems to be mostly aimed at luxury boat builders so the ply would be top quality marine grade. The Okoume version certainly is but with birch you have the choice of the top 3 grades available. Can also be flame retardant or even fire proof.
The biggest problem I see is the minimum order of 10 or 20 sheets. That's an awful lot of boxes you'd have to build. 😉
I shudder to think of the price per sheet...
As for woodworking I suppose butt joints would be quite pointless.
The least resonant cabinets I've built, tested by listening and knocking techniques, have been a pair of small bookshelf Woden Bloodhounds for Alpair 5.3's, built in 12mm poplar core ply, then cased in 12mm travertine limestone floor tile material. A wet saw and drill stand with the appropriate bit made fabrication simple, if not easy or mess free, but they look good, sound very clean, and weigh about 15kg each!
Multi layering of different materials seems to work well. Cabinets for Alpair 12pw internally braced and covered in 2mm slate veneer over 18mm far eastern ply are also pretty inert, and volume for volume considerably lighter.
If you enjoy the construction process, which if you are going to bother building loudspeakers you should, then a bit of extra work to get the best from the design can be very satisfying. Not sure about 9 layers, though if creating curved shapes from flexible ply and/or bendable MDF that could be worth a go.
Multi layering of different materials seems to work well. Cabinets for Alpair 12pw internally braced and covered in 2mm slate veneer over 18mm far eastern ply are also pretty inert, and volume for volume considerably lighter.
If you enjoy the construction process, which if you are going to bother building loudspeakers you should, then a bit of extra work to get the best from the design can be very satisfying. Not sure about 9 layers, though if creating curved shapes from flexible ply and/or bendable MDF that could be worth a go.