Foam Core Board Speaker Enclosures?

[xrk971]

No baffle step correction needed as the speaker is 'flat' and against wall so infinite baffle. Direct drive from amp is always cool. No waste, nothing added. Don't have condensation problem with my window, but may spray with artists varnish at some point.

[overtheairbroadcast]

Inifinte baffle, no need for baffle step correction... got it! Thank you xrk971.

[Cal Weldon]

I can't see my spirals.

[overtheairbroadcast]

And just in case anyone doesn't have a copy shop that is nearby (like me -- I am in the no man's land of large sheet copy places). When I am alone and have spare time, I rasterbate...

That didn't come out right.

I am using an old and trusty program called the "Rasterbator". It is pretty good and very cool, input your jpeg image and select your output size. It spits out a single .pdf file that when you print on your printer, prints it as tight to the edge as your printer allows, it then collates the pages, and you just have to tile them like so and add tape.

You can get it here:

The Rasterbator 1.2 at arje.net

You can also read about it on Wikipedia and google it to make sure you are within the system requirements (and that you aren't downloading malware of some sorts).

[xrk971]

Cal,
Your wood facers look awesome though. Home Depot has sheets of acrylic (1/8 in thick I think) but size is 24 x 24 in. You may need to contact place that fabs custom acrylic display cases and they get you a sheet of quarter inch for next build. Clear on both sides for window mount. A see through window speaker... Heck, make the faces out of glass! Fragile but would work well I bet.

[planet10]

Originally Posted by overtheairbroadcast

... with this being a single full range driver, why is there no snubber thing-a-majiggy on the back end where other single full range driver speakers often do?

None of those around here. Use of a Zobel is more an amp related thing, helping adjust the top end to the amp's output impedance.

dave

[badman]

Originally Posted by planet10

Use of a Zobel is more an amp related thing, helping adjust the top end to the amp's output impedance.

dave

Certainly true for fullrangers. Not so much in multiways, where impedance compensation is critical to making passive XOs work.

[6L6]

The other horn coming along, it took about 1.5hr from a bare board to here -

Layout is quite fast once you have holes in the paper. I wish I figured that out on the first one. Yes, this spiral is mirrored from the first.

[Cal Weldon]

Nice to see the progress. To do the trace, I used one of those tiny Philips screw drivers and made about 100 pokes per divider. When the paper was removed it was easy to follow and do the trace but as xrk said, make sure you do one spiral at a time.

[xrk971]

6L6,
You have some really nice bends/curves - I can't tell where the scores are. Great progress. The second one goes so much faster because you know what you are doing. Is the black stuff the same as the Dollar Store white foam core? It looks really nice and thick facing paper.
Did you power up the first one with a driver yet?