GM-416-8B MLTL Corner Cabinet

[GM]

The initial expansion is a conical round to rectangular transition to cover most of its BW, then an expo flare AFAIK [haven't reverse engineered it] to cover the low end, overall pattern control.

GM

[VolvoHeretic]

The initial expansion is a conical round to rectangular transition to cover most of its BW, then an expo flare AFAIK [haven't reverse engineered it] to cover the low end, overall pattern control.

GM

Thanks GM, so I can assume that it is one quarter of a truncated ellipse (math is not my friend)(AutoCAD will only draw Arcs and Ellipses). That bulge just in front of the 90 degree flare is interesting. I should take my 511 outside and take zoomed in pictures of its front, plan, and side views, import them, scale them. and draw 99% accurate drawings just for giggles. I could always use the digital calipers from work and make poster board cutout templates of the interior horn flares and make manufacturing drawings, except nobody likes these horns.

I would show my Volvo front suspension drawing from photos, except that Photobucket is OFF LINE!

James, the Heretic

[Phil-G]

there's a lot to said for paper and graphite.

or even a ball point pen and an envelope

[VolvoHeretic]

there's a lot to said for paper and graphite.

or even a ball point pen and an envelope

Or bar napkin and beer.

[Phil-G]

Or bar napkin and beer.

don't you mean bar napkin and lipstick?

[VolvoHeretic]

My latest version of the front baffle.

My idea of using flat rings of brass for the bass speaker and the 5"-9" dia. adjustable port grill cloth frames hit a snag. I have figured out that you could cut both rings out of the same piece of flat plate so you would need two for both speaker. A quick search found a place selling 24"x24"x1/8" 260 brass sheets, except the price is $400, so $800 total. They also sell 2'x2'x3/16 3003 aluminum for $30, I suppose it could be painted with a bronze finish.

[srivenkat]

My latest version of the front baffle.

My idea of using flat rings of brass for the bass speaker and the 5"-9" dia. adjustable port grill cloth frames hit a snag. I have figured out that you could cut both rings out of the same piece of flat plate so you would need two for both speaker. A quick search found a place selling 24"x24"x1/8" 260 brass sheets, except the price is $400, so $800 total. They also sell 2'x2'x3/16 3003 aluminum for $30, I suppose it could be painted with a bronze finish.

VolvoHeretic,

Great diagram, thank you. Interesting thought on brass rings, or, I thought of using removable port boards.

Also, for the curved back, I spent more time today trying (smaller boards and logs) on the cuts to make the joints. It is getting simpler, I initially took that as semi-circle and counted the number of boards (# 8) but the 22.5 degree cut (on the edges) didn't align to get the depth (26-1/2) and width. So, each piece edge requires different angle cut to align for this measurement. Not sure whether the CAD diagram can suggest the required angle for each board on both edges.
Now, I am planning to cut different angle edges (15, 22.5, 30 and other sizes) to try to get the right shape. Once I figure out the right angles, things can get better.

Thank you,
Sri

[Phil-G]

[QUOTE=VolvoHeretic;1966957]My latest version of the front baffle.

My idea of using flat rings of brass for the bass speaker and the 5"-9" dia. adjustable port grill cloth frames hit a snag. I have figured out that you could cut both rings out of the same piece of flat plate so you would need two for both speaker. A quick search found a place selling 24"x24"x1/8" 260 brass sheets, except the price is $400, so $800 total. They also sell 2'x2'x3/16 3003 aluminum for $30, I suppose it could be painted with a bronze finish.QUOTE]

powder coat is an option here a link for a metallic brass
BRASSY GOLD Powder Coat PPS-6530 | Prismatic Powders