Foam Core Board Speaker Enclosures?

[KLBIrd]

This is the completed Tunnel Reflex hybrid. The front panel is 1/4" plywood glued over the foam front panel for rigidity and provides a better material to anchor the driver. The tweeter is housed in a foam box with the crossover cap and a SPST toggle switch so I can do both full range and two way testing, as I intend to try other drivers in the reflex. The sound is fantastic for such a small drive. The bass is more than adequate and the mid-range is superb. I think this size box is about the limit for this type of foam board. If I build any larger enclosures I am going to try the 1/2" insulation foam.

[xrk971]

Ken,
Fantastic job! I really like the plywood suprabaffle. Looks great and it sounds great too I bet. You have given me some ideas for the next driver to try. How does it sound without the tweeter? Can you tell me which tweeter you are using and the cap used for the xover?

Sounds like you are enjoying your foam core creation though. Oh, and can you show us the dimensions or plan for your box, maybe more detailed internals photos?
Thanks,
X

[KLBIrd]

he tweeter is a 3/8ths inch dome bought from PE in 2004. They had trailer loads of Delco and Nissan car speakers on sale and I bought 50 of the tweeters for.50 each. They are housed in a metal frame and work well from about 5K up. I've used them in many projects including a line array featured on the cover of Audio Express in, May, 2008. The cap is a 4.7uF. without the tweeter you do lose some higher dimensions, especially on orchestral triangles, bells, ect. Most people would be satisfied without the tweeter. The external dimensions are 16 in D, 12" high, 6" in. wide.

[Cal Weldon]

Great job Ken. I like the tombstone box for the tweeter.

[guangui]

Originally Posted by KLBIrd

This is the completed Tunnel Reflex hybrid. The front panel is 1/4" plywood glued over the foam front panel for rigidity and provides a better material to anchor the driver. The tweeter is housed in a foam box with the crossover cap and a SPST toggle switch so I can do both full range and two way testing, as I intend to try other drivers in the reflex. The sound is fantastic for such a small drive. The bass is more than adequate and the mid-range is superb. I think this size box is about the limit for this type of foam board. If I build any larger enclosures I am going to try the 1/2" insulation foam.

Really nice loo, where you always planning on adding a tweeter, or it was an afterthought?

[KLBIrd]

I pre-tested the FR 10 in a .4 cu ft. box and found liked it better with a tweeter. At my age, I need all the highs I can muster. It has a toggle switch so I can test other drivers with and with out the tweeter.

[guangui]

Originally Posted by KLBIrd

I pre-tested the FR 10 in a .4 cu ft. box and found liked it better with a tweeter. At my age, I need all the highs I can muster. It has a toggle switch so I can test other drivers with and with out the tweeter.

Nice idea (toggle)! I have a pair of Tang Band W3-1364SA, 3" Bamboo Paper Cone, coming in, as well as a pair of TB W3-881SI. I might leave the 881's in the uFonken, and design a similar enclosure to yours for the 1364's. Or, I might just keep going with the OB hybrid bookshelf (vented 5-1/4" woofer) that I wan to do and test with the 1364's.

[KLBIrd]

The attached would be a real challenge to build in foam or any other material. It is from an article in Radio Craft Magazine in 1938. They call it an infinite baffle but it looks like a labyrinth and the sound path is over 30 feet long. The two 12" drivers are filed coil types.
Anybody game for this one?

[xrk971]

For all you Foamers out there, I just started building a foam core class D amp with the new TI TPA3118D2 chip.

TPA3118D2

[xrk971]

Originally Posted by KLBIrd

The attached would be a real challenge to build in foam or any other material. It is from an article in Radio Craft Magazine in 1938. They call it an infinite baffle but it looks like a labyrinth and the sound path is over 30 feet long. The two 12" drivers are filed coil types.
Anybody game for this one?

I would sim it in Hornresp first, looks like a tapered TL. The WAF is terrible on this one!