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Hey Tech Talk,
Long time no build thread. Trying something new here, thanks for checking it out...
So for a while now I've been wanting to build surround speakers for my home theater. They need to be small, wall-mounted, and toed-in quite a bit since the couch is only a few inches from the rear wall. They'll be crossed to a sub at 90hz.
After researching a number of really nice DIY "micro monitors" out there, I decided on the Choti HT Surrounds, a 1.7 liter vented enclosure using the Dayton RS100-4 and Dayton ND16FA . Big thanks to Navy Guy for sharing his design. See here for his original build thread:
http://techtalk.parts-express.com/fo...0-4-and-nd16fa
While the enclosures I've designed are obviously a big departure from the traditional mdf box Navy Guy used, the internal volume and port dimensions are the same. Hopefully I don't screw it up in some other way, no doubt Tech Talk will let me know
For a number of reasons, not the least of which is a big new resin printer in my possession, I decided to 3D-print the enclosures, with hollow outer walls that I'm going to fill with sand. Not sure if these qualify as "decoupled walls", as there are quite a few very strong ribs tying them together.... but perhaps some benefit will occur over a typical plastic speaker. That is the hope anyways.
The sand will be filled to within 1/8" of the top, and then I'll cap it off with epoxy. In order to make sure the sand is well packed, I'm going to somehow vibrate the enclosure as the sand is being poured.... I'm thinking I might hang the enclosure from a rope and tap it with a mallet as I'm filling it with sand. and then tamp it down as I go. This will no doubt take some experimentation....
The insides will be lined with 1/2" sonic barrier.
First are some screenshots from Solidworks. Note that I'm showing some cross-sections here so show what's going on inside better....
And now for the prints. Phrozen Transform Sonic printer with Epax Hard Resin. Print time 22 hours.
Long time no build thread. Trying something new here, thanks for checking it out...
So for a while now I've been wanting to build surround speakers for my home theater. They need to be small, wall-mounted, and toed-in quite a bit since the couch is only a few inches from the rear wall. They'll be crossed to a sub at 90hz.
After researching a number of really nice DIY "micro monitors" out there, I decided on the Choti HT Surrounds, a 1.7 liter vented enclosure using the Dayton RS100-4 and Dayton ND16FA . Big thanks to Navy Guy for sharing his design. See here for his original build thread:
http://techtalk.parts-express.com/fo...0-4-and-nd16fa
While the enclosures I've designed are obviously a big departure from the traditional mdf box Navy Guy used, the internal volume and port dimensions are the same. Hopefully I don't screw it up in some other way, no doubt Tech Talk will let me know
For a number of reasons, not the least of which is a big new resin printer in my possession, I decided to 3D-print the enclosures, with hollow outer walls that I'm going to fill with sand. Not sure if these qualify as "decoupled walls", as there are quite a few very strong ribs tying them together.... but perhaps some benefit will occur over a typical plastic speaker. That is the hope anyways.
The sand will be filled to within 1/8" of the top, and then I'll cap it off with epoxy. In order to make sure the sand is well packed, I'm going to somehow vibrate the enclosure as the sand is being poured.... I'm thinking I might hang the enclosure from a rope and tap it with a mallet as I'm filling it with sand. and then tamp it down as I go. This will no doubt take some experimentation....
The insides will be lined with 1/2" sonic barrier.
First are some screenshots from Solidworks. Note that I'm showing some cross-sections here so show what's going on inside better....
And now for the prints. Phrozen Transform Sonic printer with Epax Hard Resin. Print time 22 hours.
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