DIY Subwoofer: Would like some feedback!

10988 Views 30 Replies 12 Participants Last post by hddummy, Jan 17, 2008

hddummy

Discussion Starter · Sep 12, 2007 (Edited)

Hey guys. I've been around here before, but I've never really been an active member. I recently built myself a sub and I wanted to get some feedback from you folks. This project is done, but I could apply suggestions and advice to the next DIY I am planning to build for my brother-in-law.

Anyway...I love the way this thing turned out...it has a tremendous amount of bass and it makes me grin ear to ear every time I crank it up.

The stats:
TC 12db-500
115 Liter enclosure
Two 3" x 17" ports
Tuned 21.8 Hz
Walls lined with fiberglass batting
Butt Kicker Amp with 25Hz HP

One of my concerns was whether or not I should have used more internal bracing. Questions/Comments? Thanks for checking it out!!

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Kermie

· #11 · Sep 14, 2007

hddummy,

I have been looking for a project just like yours for both my left and right front corners of the HT.

Can you tell me how you decided on the volume of the cabinet. I am looking at doing a down firing sub with the port facing forward firing towards the room (HT)

I have about 24 inches for the face of the triangle and about 17 inch for side A and B.

What are the dimensions of your sub?

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Kermie

· #14 · Sep 14, 2007

Mike P. said:
Hi Kermie,
I'm "uklit" from AVS. I'm glad this is what you were looking for. What sub driver are you thinking of using for your corner subs?

uklit, thank you for this link. i think the largest i could fit would be a 12 inch. I have to look into a brand. I will have one in each corner of my front wall and have a Crown XLS 402 to run them both.

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Kermie

· #16 · Sep 14, 2007

typically how much cubic feet do bracing take up and the port.

do subtract the about of wood used in bracing and the whole port (If concidered a solid) from the over all cubic feet?

also can you expand on the choices of drivers?

thank you

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Kermie

· #22 · Sep 16, 2007 (Edited)

Joe L. said:
Thanks for the clairification.
I understood it is Kermie who wants to build similar shaped enclosures for subs in the front corners of his Home Theater. He gave 17 inches for the left and right sides, 24 inches across the baffle, but did not specify the height. If the enclosures don't have a screen have above them, he may not be limited to 3.5 cubic feet volume, since the enclosure height may be adjusted accordingly.

I built a 260 Liter sonosub using an 18" diameter Sonotube and a 6" port out the top tuned to just under 17 Hz. It is not very much different in its footprint on the floor than his proposed enclosures with 17" sides. It is a lot more than 3.5 cubic feet internal volume since it is 6 1/2 feet tall.

I can tell him about one thing for sure. Corner placement will result in a LOT of bass coupling to the adjacent walls. If there are doors, pictures, or anything hanging on the walls nearby, they will rattle.

I had to weatherstrip my closet doors when I put my sonosub in the corner adjacent to a wall. They easily rattled in their frames until I put the weatherstripping in place. I even had to wrap the same foam around the doorknobs shafts, so they would not rattle as the door vibrated. (I was using a 15" Adire Tempest driver that displaced 2.5 liters of air.)

Moving my sub a foot or so away from the corner made it bearable in my room.

Joe L.

I am sorry, I didn't want to hijack this thread for my stuff. I just love the corner sub idea. the height i have to work with is 36 inches. I am limited. It will be roughly 3.2 cubic feet (17x17x36)/2 for volume

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