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DIY Sub Questions (Atlas 15)
15 replies to this topic
Posted August 12 2005 - 01:33 AM
I'm going to start my Atlas 15 project in the next few weeks. I have a few questions that I can't seem to find the answers to... I was going to use a 6" PVC port. When subtracting the port volume from the internal volume do you figure the port as a solid cylinder or just like it is (with a big hole in the middle)? For some reason I got the impression somewhere that you figure it as a solid cylinder... How long should the legs of my sub be for a downfiring sub? The Atlas 15 will probalby not be flush mounted. Is cabinet grade Oak plywood ok to use for the enclosure? I'm sure it probalby is, I just wanted to check to be safe. And one more general woodworking question. If I use the oak plywood should the grain be running up and down or is side to side ok? I'm guessing whichever I choose it should all be going in the same direction? Thanks in advance! Troy
Posted August 12 2005 - 02:27 AM
The best choice is Baltic Birch ply it's void free. The sides walls of the cabinet should be 1.5" thick. The baffle board should be 3 layers of 3/4" and the insides should be adequately braced. The leg length has been ask and answered dozens of times, so a search will get you that answer and more...
Posted August 12 2005 - 03:25 AM
Thanks for your replies! I've searched and I can't find a solid answer, I've seen anything from 2-4 inches, or more. And a lot of those answers were based on a flush mounted driver... Thanks again!
Posted August 12 2005 - 05:22 AM
Troy I have cabinet plans for a ported atlas 15 from ascendant audio. I believe it recommends 6" for the legs. I can email them to you if you want. Its a pdf file. Has CAD drawings and cut list. Its a 6.0 cu. ft. tuned to 18Hz uses 2 4" precision ports.
Posted August 12 2005 - 06:02 AM
Posted August 12 2005 - 06:33 AM
For a down firing sub, the minimum leg length is typically half the diameter of the driver. IE a 15" down firing sub should have 7.5" legs.
Posted August 12 2005 - 07:18 AM
That would be great! Thanks! email: trrglr at columbus.rr.com (that's a lower case "L" in glr) sorry about my email address format, but you can never be too careful.
Posted August 12 2005 - 12:54 PM
Troy, You got mail.
Posted August 12 2005 - 01:17 PM
I built my Atlas 15 with 4" legs. No science involved, just wanted a common furniture reveal. It sounds outstanding to me. It is the 8ft3 with two 4" precision ports and a downfiring sub running off of rythmik 250 watt amp. I will post some pics when I can figure out how to.
too broke for sound
Posted November 02 2005 - 12:09 AM
I've started building my box out of MDF. I happen to have some 1/4" furniture grade oak plywood laying around. Would it be OK to use the plywood as a veneer?
Posted November 02 2005 - 03:38 AM
Posted November 02 2005 - 04:38 AM
Thanks for the reply, Thomas! Is wood glue OK to use to apply the plywood or should I use something else, like contact cement?
Posted November 02 2005 - 07:28 AM
If you can get even pressure on the boards I'd recommend TiteBond II over contact cement
Posted November 03 2005 - 12:18 AM
Thanks again, Thomas.