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Old 19th May 2012, 12:26 AM   #2101
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Looks great!
What element?
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Old 19th May 2012, 04:21 AM   #2102
Carlp is offline Carlp  United States
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Looks an awful lot like a commercial Tang Band speaker design I've seen (Tang Band D4-1 DIY Back Horn Speaker Kit). Is this really DIY?
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Old 19th May 2012, 11:27 PM   #2103
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How do those Diatones sound to you?
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Old 1st June 2012, 02:47 PM   #2104
IG81 is offline IG81  Canada
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Here's some small folded TL's I quickly put together to have something for Netflix and YouTube on the bedroom PC. Driver is the 4.5" Pioneer A11. The box has a 2 liters coupling chamber and a ~30" line about 4 liters in volume. It's damped on the initial 2/3 with polyfill quilt batting. Finish is gloss black Tremclad and a cork sheet in front.

Click the image to open in full size.

Click the image to open in full size.

Response, with mic ~8" away from the cone and pipe output, speaker on a stand and "baffled" with a 20"x30" foam-core sheet to minimize front-back interference a bit.

Click the image to open in full size.

They do well enough for their intended purpose, the aim was compact. The variable loudness control on the Denon receiver that drives them makes for a decent ersatz-BSC. They are playing roughly in quarter-space though, especially if seated in front and nearfield, so they don't need much of it.

IG
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Old 1st June 2012, 04:40 PM   #2105
TerryO is offline TerryO  United States
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IG,

Again you've done a great job. A "little" different from your Karlson's, but very nice all the same!


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TerryO
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Old 1st June 2012, 04:59 PM   #2106
IG81 is offline IG81  Canada
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Quote:
Originally Posted by TerryO View Post
IG,

Again you've done a great job. A "little" different from your Karlson's, but very nice all the same!


Best Regards,
TerryO
Thanks! Seems like I go for real big or real small, to my scale at least. Though I am cooking up something on the large side of things, to be built in coming months hopefully.

IG
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Old 1st June 2012, 06:27 PM   #2107
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Looks nice IG! Any chance of seeing what the internals of the enclosure look like?

Kyle
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Old 1st June 2012, 06:31 PM   #2108
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by KyleinCowichan View Post
Looks nice IG! Any chance of seeing what the internals of the enclosure look like?

Kyle

posted elsewhere:

Click the image to open in full size.

As Jeff noted, really more of an aperiodic than a critically damped TL - but should still work just fine
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Old 1st June 2012, 06:32 PM   #2109
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Ah, thanks Chris! Very cool.

Kyle
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Old 1st June 2012, 07:14 PM   #2110
IG81 is offline IG81  Canada
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Quote:
Originally Posted by chrisb View Post
posted elsewhere:

Click the image to open in full size.

As Jeff noted, really more of an aperiodic than a critically damped TL - but should still work just fine
That was a test setup and the final iteration has the first two thirds of the line damped with poly-fill batting, that is to say, the last vetical section was left empty. The coupling chamber is only lined with some thick felt, something called "Maxolite".

I've yet to check the impedance profile for this little speaker, but IMO it will be close to a single peak, much like a closed/aperiodic box. Sticking my ear close to the pipe exit, there is more to be heard than a true aperiodic box though. I stuck enough polyfill to kill some upper-band ripples along with two deep notches.

IG
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