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bzdang 11th March 2005 03:13 AM

Food for thought - B3S
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Saw these cookie jars at the supermarket today, couldn't resist.

Dave Jones 11th March 2005 05:36 AM

How wide is the opening?

knorke 11th March 2005 05:43 AM

That looks promising...
You might consider to coat the inside of the jar
with something that damps the resonances of
the porcelain.....

bzdang 11th March 2005 10:04 PM

2 Attachment(s)
The opening was 4.5 inches with a roughly 5 inch step around the hole.
Here's a photo of it with the baffle installed, made from a threaded cap for 4" ABS DWV pipe. It helps to have a lathe or access to one. It's thoroughly stuffed with itchy fiberglass insulation and doesn't ring when I tap on it. It's the focus of my first foray into measurement so I will likely post some measurements when I figure it out.
Subjectively the thing sounds better than I expected for something so small and inexpensive.

knorke 12th March 2005 01:11 AM

I think they will measure quite good...
Keep us informed about the cookie jar speaker ;-)

bzdang 12th March 2005 02:06 AM

2 Attachment(s)
Here is a set of measurements by sine sweep, my family is feeling tortured ;) by my new apparatus.

I measured without EQ, with and without mic cal file, and after applying some BSC and two parametric filters to minimize the large peaks at 8.3kHz and 15.5kHz

I can't listen to music until morning so no opinions on the eq'd sound yet. I'm very very interested in learning how to measure phase and to see how badly the digital crossover affects it compared to passive crossovers.

bzdang 12th March 2005 02:08 AM

2 Attachment(s)
The EQ, brought to you by kxproject !

Shahin 12th March 2005 10:08 PM

This looks so good! I'm feeling inspired to something with an old fishbowl I have...

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