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Old 15th December 2013, 11:49 PM   #2081
jfresh is offline jfresh  Australia
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Hi X, just wanna say thanks for introducing foam medium, please don't flame me about calculation, I just made this for fun. portable light speaker with a tiny amp. cheers jeff.

http://s29.postimg.org/mlfhwt7bb/IMG_1761_1.jpg
http://s14.postimg.org/otdh3oe8x/IMG_1762_1.jpg
http://s28.postimg.org/v5saaijp9/IMG_1760.jpg
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Old 16th December 2013, 12:01 AM   #2082
xrk971 is offline xrk971  United States
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Jfresh,
On the contrary, those like fantastic! Nice work there. How do they sound?

X
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Old 16th December 2013, 01:54 AM   #2083
jfresh is offline jfresh  Australia
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interestingly they sound quite good, it's driven by PAM8803, battery life is insane, I use a spare mobile phone battery 3.7v li-on 1200mah. last about a week, till recharge. speaker ripped off and old imac, I figure if apple uses these speaker, must be decent enough.

still looking for a nice 1" FRDriver. work to do : add BT module, add bigger volume button. at the moment, i have to poke on the pcb for volume, theres a mini tactile button on the pcb to control up & down volume. but i love the weight it's soo light (thanks to u).
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Old 16th December 2013, 02:38 AM   #2084
xrk971 is offline xrk971  United States
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Try the Sure TPA3110D2 amplifier ($10 at PE). Great battery life on that too but requires 6 volts I think. Sounds really good though. If you go with BT, beware of the ground loop noise problem that requires an isolated DC-DC converter. Look in class D forum - several threads there discuss this.
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Old 16th December 2013, 06:30 AM   #2085
jfresh is offline jfresh  Australia
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I do own the Sure TPA3110D2. its too to big fit inside the enclosure, would be awesome though.

here's the size comparison, TDA3110D2, YDA148 & PAM8803 (the amp used)

Click the image to open in full size.

Last edited by jfresh; 16th December 2013 at 06:49 AM.
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Old 16th December 2013, 09:28 AM   #2086
xrk971 is offline xrk971  United States
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Jfresh,
Ok, you win the prize for smallest foam speaker - I did not realize it was so small. How do you cut that bead board foam so cleanly? It looks like it was laser/CNC cut?
Great looking build with the plexiglass. Someone really should do that with the Cornu.
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Old 16th December 2013, 10:47 AM   #2087
jfresh is offline jfresh  Australia
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X, thanks for the compliment. it was my challenge to make the smallest horn, even so small horn never disappoint. i do own a tiny cnc not laser. the cut is not as clean as you think, it would be perfect with laser.
the board is not actually foam core, just ordinary junk foam from packaging, i made a foam slicer from an old scanner, nothing fancy hot wire & arduino as controller.
yes, it could work with cornu.
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Old 16th December 2013, 11:02 AM   #2088
xrk971 is offline xrk971  United States
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You made your own CNC with Arduino - very impressive! I bet you could make a 3d printer with same technique. I am thinking a hot melt glue gun could be used to melt abs rod stock to lay down layers and print a horn. It could have very complicated 3d channels.
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Old 16th December 2013, 01:40 PM   #2089
xrk971 is offline xrk971  United States
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Default Sim of Nautaloss with floor and rear wall reflections

This seems to match the earlier measurement that showed a cliff near 300 Hz. Placing speaker at angle to room walls and adding foam on floor removed this effect.
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File Type: png Nautaloss-sim-with-reflections.png (28.8 KB, 4517 views)
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Old 25th December 2013, 02:43 AM   #2090
xrk971 is offline xrk971  United States
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Default Foam Core Sealed Push-Pull Quad Driver Sub

In case you have not seen this - This is my biggest foam core speaker to date. Each side uses a full sheet and the face where the 4 drivers are mounted uses 3 layers. It sounds really nice with clean tight bass. Extension is only 50 Hz but it reaches clear up to anywhere you want to cross over. Very fun build and measures very well.

The Nautaloss Ref Monitor

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