Open baffle headaches! (A.K.A: Spasticteapot is stupid.)

Spasticteapot · 24th October 2006, 05:22 AM

After much fiddling in The Edge, I think I found a half-decent design for the Foster woofers on sale for 3$ at Madisound. It's got a sorta-flat curve (no more than +/- 1.5db) from about 100hz up to 10khz; much as I'd like it to go lower, that's not likely an option.

However, my design, which is essentially a triangle with the point facing twoards the listener, and the driver near the point. (See the picture below). The little circle is the tweeter; the big circle is the Foster woofer.

These are designed to be inexpensive speakers for use at a local coffeehouse. (They currently have tinny crap, and will pay in coffee. They also have REALLY good espresso.) I'd like to try a pair of the El Cheapo foster woofers, plus a pair of inexpensive tweeters (perhaps the 5$ ribbons from ApexJr?) and use them with a small Teac amplifier capable of 50w/channel.

Should I stick with these?

I've also heard of great results with a Hi-Vi B3s in an open baffle. If someone can explain how to make this work, I would be exceedingly grateful. (ESPECIALLY if you can do it with a 24"x36" piece of Acrylic.)

pinkmouse · 24th October 2006, 08:29 AM

I saw the title of this thread, and was about to consign it to Texas, then I saw it was your own work!

OK, my thoughts. Mount your cheap drivers on a triangle of acrylic, then supend that in the corner of the room, facing downwards at 45 degrees, so your triangle fits into the three planes of the corner. You can tweak the bottom end response by moving the baffle into or out of the corner, changing the gap around the outside. I'm not quite sure how you could model this, but it should work well and look very stylish.

Oh, and mine's a double espresso.

Spasticteapot · 24th October 2006, 09:06 PM

Odd. The .BMP was not included.

preiter · 24th October 2006, 10:00 PM

How big is this coffeehouse?

That Foster woofer has only 86dB sensitivity and only handles 25 watts.

Spasticteapot · 24th October 2006, 11:13 PM

Quote:

Originally posted by preiter
How big is this coffeehouse?

That Foster woofer has only 86dB sensitivity and only handles 25 watts.

About the size of my living room for the coffee drinking area. (The front room is even smaller.) Hence, nothing big is needed.

UNDERSTANDIN · 25th October 2006, 01:49 AM

What are your impressions of those Foster woofers? What type of circuit are you using or running them full range?

Spasticteapot · 25th October 2006, 04:44 AM

Quote:

Originally posted by UNDERSTANDIN
What are your impressions of those Foster woofers? What type of circuit are you using or running them full range?

I have'nt bought any yet; I don't own a car, and wanted to figure out how usable they'd be before buying them.

Spasticteapot · 26th October 2006, 05:52 AM

Bump for bump's sake!

sreten · 26th October 2006, 02:20 PM

Hi,

I'm confused.
Open baffle as shown will have no bass,
they are far too near the edges of the baffle.

/sreten.

Spasticteapot · 26th October 2006, 07:56 PM

Quote:

Originally posted by sreten
Hi,

I'm confused.
Open baffle as shown will have no bass,
they are far too near the edges of the baffle.

/sreten.

Only down to about 100hz; below that there's a sharp drop. I can send you my design in EDGE format, if you'd like.

24th October 2006, 05:22 AM	#1
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	Open baffle headaches! (A.K.A: Spasticteapot is stupid.) After much fiddling in The Edge, I think I found a half-decent design for the Foster woofers on sale for 3$ at Madisound. It's got a sorta-flat curve (no more than +/- 1.5db) from about 100hz up to 10khz; much as I'd like it to go lower, that's not likely an option. However, my design, which is essentially a triangle with the point facing twoards the listener, and the driver near the point. (See the picture below). The little circle is the tweeter; the big circle is the Foster woofer. These are designed to be inexpensive speakers for use at a local coffeehouse. (They currently have tinny crap, and will pay in coffee. They also have REALLY good espresso.) I'd like to try a pair of the El Cheapo foster woofers, plus a pair of inexpensive tweeters (perhaps the 5$ ribbons from ApexJr?) and use them with a small Teac amplifier capable of 50w/channel. Should I stick with these? I've also heard of great results with a Hi-Vi B3s in an open baffle. If someone can explain how to make this work, I would be exceedingly grateful. (ESPECIALLY if you can do it with a 24"x36" piece of Acrylic.)

24th October 2006, 08:29 AM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I saw the title of this thread, and was about to consign it to Texas, then I saw it was your own work! OK, my thoughts. Mount your cheap drivers on a triangle of acrylic, then supend that in the corner of the room, facing downwards at 45 degrees, so your triangle fits into the three planes of the corner. You can tweak the bottom end response by moving the baffle into or out of the corner, changing the gap around the outside. I'm not quite sure how you could model this, but it should work well and look very stylish. Oh, and mine's a double espresso. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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24th October 2006, 10:00 PM	#4
preiter diyAudio Member Join Date: May 2006	How big is this coffeehouse? That Foster woofer has only 86dB sensitivity and only handles 25 watts.

25th October 2006, 01:49 AM	#6
UNDERSTANDIN diyAudio Member Join Date: Apr 2005 Location: New Jersey	What are your impressions of those Foster woofers? What type of circuit are you using or running them full range?

26th October 2006, 05:52 AM	#8
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	Bump for bump's sake!

26th October 2006, 02:20 PM	#9
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, I'm confused. Open baffle as shown will have no bass, they are far too near the edges of the baffle. /sreten.

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