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Old 12th March 2013, 10:12 PM   #1511
xrk971 is offline xrk971  United States
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You have a point Cal, as I don't think anyone has done a direct A/B test of same speaker in wood and foam core. Do you think the cornu sounds better in wood? I know you have built both but they weren't the same speaker as sizes and drivers were different. But then the spiral channels were foam in both, if yo ahd to make it out of all wood, you may have not made it at all. You will have more 'passive' radiation from the foam core walls but that is not necessarily bad. It is different. I have built about 7 different speakers out of foam core now maybe I need to try an identical one in wood? The MLTL would be an easy one to do.
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Old 12th March 2013, 11:18 PM   #1512
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Quote:
Originally Posted by xrk971 View Post
if yo ahd to make it out of all wood, you may have not made it at all.
Bingo.
Quote:
maybe I need to try an identical one in wood?
I wouldn't. You don't really want to know do you?
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Old 13th March 2013, 12:56 AM   #1513
guangui is offline guangui  Puerto Rico
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Finished my latest Foam Core project...Designing Tang Band 881si Enclosures
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Old 16th March 2013, 08:03 PM   #1514
xrk971 is offline xrk971  United States
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Default The World's First Full Foam Core Audio System

I finished my foam core amplifier and ran it with my foam core micro-Cornu's. I guess this makes it the world's first foam core audio "system"?

Anyhow, the TI TPA3118D2 sounds great! A lot of fun to do and I learned a new skill: microsurgery! Soldering those tiny leads (0.6 mm pitch) to 0503 SMD components was quite the challenge!

You can read more about it here:

TPA3118D2


Click the image to open in full size.

Click the image to open in full size.

Last edited by xrk971; 16th March 2013 at 08:10 PM.
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Old 16th March 2013, 08:59 PM   #1515
KLBIrd is offline KLBIrd  United States
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Nothing like the combo of foam and electrons!
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Old 16th March 2013, 09:32 PM   #1516
guangui is offline guangui  Puerto Rico
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Not much grounding issues, that's for sure!
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Old 16th March 2013, 09:35 PM   #1517
xrk971 is offline xrk971  United States
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Grounding issues???
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Old 18th March 2013, 03:06 AM   #1518
BWRX is offline BWRX  United States
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I've never seen anyone crazy enough to do a deadbug solder job on that kind of IC. Congratulations on actually getting it up and running without shorting anything out.
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Old 18th March 2013, 03:23 AM   #1519
xrk971 is offline xrk971  United States
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Thanks BWRX!
I am kind of crazy but really glad I did it because this amp rocks! It sounds so good you would not believe your ears. To see this little fleck of an IC without a heat sink pumping the kind of bass and volume into the speakers with sound that fills the room is just amazing. I am sold on Texas Instruments class-D TPA's now. They are great sounding amplifiers.
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Old 18th March 2013, 03:35 AM   #1520
BWRX is offline BWRX  United States
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I've designed, built, and listened to small class D amps years ago and they still sound just as good as commercial amps that cost many times more. Their efficiency is definitely a wonderful bonus.
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