GM-416-8B MLTL Corner Cabinet

[srivenkat]

have you considered laminating a panel?

Phil-G,

I like to laminate and sure it will look really nice. I'm new to the woodworking and learning the angle cuts now, getting prepared for the actual build once GM finalizes the design/internal details.

Thank you,
Sri

[Phil-G]

it would look nice, but it would also be very strong.

[GM]

have you considered laminating a panel?

Took the words right out of my mouth. All this angle design is good experience, but folks, remember when I noted that with [ML]TLs the primary acoustic pressure was along its axis? This reduces the need for massive walls per se as long as its braced.


Now what is the most rigid, efficient shape? A cylinder. Combine the two and with some bracing along its axis, the wall can be as little as an 1/8" thick if you use a section out of sheet metal, bending wood, an appropriately large diameter cardboard concrete forming/structural tube such as 'Sonotube' or just laminating cardboard sheet over a form.


Anyway, there's myriad ways to do this and don't require fancy tools, etc., so let your imagination/needs decide how you want to do this; leaving bracing as the 'final frontier' and while all this [multiple] angle stuff would seem to be needed if octogon/whatever multiple flat panel construction is desired, the reality is that the easy/lazy/cheap way now that powerful, cheap, thick, adhesives to fill large voids are available in caulk tubes, using dowels or similar of the appropriate diameter for the intended app [closet rod for large cabs is my choice] are the 'no-brainer' way to brace, tie together any angle cylindrical, stepped, slatted, cubic/whatever construction.


GM

[VolvoHeretic]

And just in case you want to build a true round-back speaker with bending plywood. We used to build round drywall shower enclosures like this after laying 1/4" gypsum board on dampened concrete overnight.

[Phil-G]

mighty fast on the raw there pardner

[Elitopus1]

And just in case you want to build a true round-back speaker with bending plywood. We used to build round drywall shower enclosures like this after laying 1/4" gypsum board on dampened concrete overnight.

Thats pretty sweet lookin!

[VolvoHeretic]

Thanks, I forgot the running horizontal dimensions. The gross volume includes the radial 2"x.75" verticals.

[VolvoHeretic]

Full round-back.

[srivenkat]

Full round-back.

VolvoHeretic,

Simply Amazing! Very detailed.

For this full round-back option either 1/4" or 3/8" bending ply can be used. Front, top & bottom are 3/4" ply.

For bracing, if I understand right,

- full round-back design, with 15 of (2"X.75") braces there is no additional bracing required inside the cabinet

- curved back (octagon) design, with 7 of (2"x.75") braces no additional bracing required inside the cabinet

Hope I am right please correct otherwise.

Thank you,
Sri

- - - Updated - - -

Took the words right out of my mouth. All this angle design is good experience, but folks, remember when I noted that with [ML]TLs the primary acoustic pressure was along its axis? This reduces the need for massive walls per se as long as its braced.


Now what is the most rigid, efficient shape? A cylinder. Combine the two and with some bracing along its axis, the wall can be as little as an 1/8" thick if you use a section out of sheet metal, bending wood, an appropriately large diameter cardboard concrete forming/structural tube such as 'Sonotube' or just laminating cardboard sheet over a form.


Anyway, there's myriad ways to do this and don't require fancy tools, etc., so let your imagination/needs decide how you want to do this; leaving bracing as the 'final frontier' and while all this [multiple] angle stuff would seem to be needed if octogon/whatever multiple flat panel construction is desired, the reality is that the easy/lazy/cheap way now that powerful, cheap, thick, adhesives to fill large voids are available in caulk tubes, using dowels or similar of the appropriate diameter for the intended app [closet rod for large cabs is my choice] are the 'no-brainer' way to brace, tie together any angle cylindrical, stepped, slatted, cubic/whatever construction.


GM

GM,

Thanks for the details, lots of options to consider.

I will explore little bit more on the bending plywood option for the full-round design - few stores here carries 3/8" bending ply but they are not BB, other sizes can be ordered. I found this during my 825 cabinet.

For both full-round design and curved (Octagon), based on the VolvoHeretic drawing, the vertical braces (2"x.75") should be enough and no additional bracing required. Hope I am right, please correct me otherwise.

M-19 foam link is very helpful, thanks.

-Sri

[VolvoHeretic]

Sri, correct on the vertical bracing, except I bet that there will be a vertical handrail pole tying the middle of the top and bottom 3/4" plywood right next to the horn driver. I will have to check and see if 3/8" bending plywood is correct, you would need (2-1/2) 4x8 sheets about 6'-2" long.