Posted January 21, 201015 yr Heys guys I will be building my sub box for 2-15inch NS subs come this summer and I had a quick question. first of all here is my box. see how the subs are firing DOWN and the full weight of the subs is on that one board, well i am going to need to support that board somehow. The 2 subs weight about 60~lb's each so 120lbs total will need to be supported. a friend told me to just use a piece of wood (dowel) and screw it from both ends and then glue it and not worry about it. but then i started to think over time due to vibration and temperature change would the screws start to lose their grip and potential come out or something of that nature? so i thought about threaded rod and some flat head screws to do the job!! take a look at the pic and let me know what you guys thing of itas you can see with the use of flat head screws and some threaded rod couplers (hex nuts) (the green things) i think that would be a better idea and i can even use 3/8 (0.375") thread rod as it is load rating is around 600lb'shere is what the coupler will look likeand screws
January 21, 201015 yr you could also do just a few long threaded rods and then drill a hole through each side of your box, run the threaded rod through and then put nuts and washers on each end to hold it in place. minimal displacement and threaded rod is fairly strong.
January 21, 201015 yr Author you could also do just a few long threaded rods and then drill a hole through each side of your box, run the threaded rod through and then put nuts and washers on each end to hold it in place. minimal displacement and threaded rod is fairly strong.um washers and nuts...what would ahppen if the bass hit and moved the rod and the road fell down? this is why i wanted the 2-flat head screws at the top to hold it in place, and to HOLD it together? plus it has to be flush with the surface fo the mdf as this will be goign into my trunk so if there any extrusion i am screwed
January 21, 201015 yr you could also do just a few long threaded rods and then drill a hole through each side of your box, run the threaded rod through and then put nuts and washers on each end to hold it in place. minimal displacement and threaded rod is fairly strong.um washers and nuts...what would ahppen if the bass hit and moved the rod and the road fell down? this is why i wanted the 2-flat head screws at the top to hold it in place, and to HOLD it together? plus it has to be flush with the surface fo the mdf as this will be goign into my trunk so if there any extrusion i am screwedwell if u tightened the nuts down together then they would not come loose...but if u dont want it extruding then yea u probably dont want to do that...ur idea would work great then.
January 21, 201015 yr You can put nuts on both the inside and the outside of the box and the threaded rod won't move anywhere. But I would definitely use the rod over the wood.
January 21, 201015 yr You can put nuts on both the inside and the outside of the box and the threaded rod won't move anywhere. But I would definitely use the rod over the wood.x2. When using threaded rod you always put nuts on both sides of the panel.
January 21, 201015 yr You can put nuts on both the inside and the outside of the box and the threaded rod won't move anywhere. But I would definitely use the rod over the wood.x2. When using threaded rod you always put nuts on both sides of the panel.Don't forget the loctite.
January 21, 201015 yr Don't forget the locktite.x2 on the Locktite, I used it on my motorcycle to keep everything tight after a couple parts kept falling off (chinese bike under $2k brand new) and have had 0 problems since.
January 21, 201015 yr How minimal is the displacement of a normal bracing size threaded rod? I doubt it would vary the tuning, right?Im liking the idea of these.
January 21, 201015 yr Use a lock washer AND a normal washer together.There's no thread lock like cross-thread CrazyKenKid, you could add some mdf panels to support the baffle against the bottom of the trunk.
January 22, 201015 yr Author yes a few things i forgot!lock washerslocktiteand cross threading! (cross threading is almost as good as contact cement or welding LMAO jk)and i think i will play around with that baffle idea!! and thanks everyone for your suggestions! they are awesome!!!Kenneth
January 22, 201015 yr IMO, the screws will pull right through the wood. Definetely a nut, lock washer and washer on each side of the wood.I would go with MDF or plywood braces 4-6" wide on two sides of each sub, with 2-3x 2.5-3.5" long screws on each end of the brace.
January 22, 201015 yr How minimal is the displacement of a normal bracing size threaded rod? I doubt it would vary the tuning, right?Im liking the idea of these.Well it's just pi*r^2 * length, which for a 3/8" rod about 20" long is only 2.2 cubic inches. I don't think you'd notice that in the sound, haha.
January 22, 201015 yr Author How minimal is the displacement of a normal bracing size threaded rod? I doubt it would vary the tuning, right?Im liking the idea of these.Well it's just pi*r^2 * length, which for a 3/8" rod about 20" long is only 2.2 cubic inches. I don't think you'd notice that in the sound, haha.? 20" = 20 feet? lol that is alot of rod! the max i will need is about 11.75 which is about 0.00075 ^3 lol as for the wood idea as a brace i am worried b/c right now my box is about 6.1~ at bestat about 40hz (not build yet but soon to be) so with wood i fear it would be to much and i would lose out on cubic volume. but will a flat head screw pull though the mdf? keep in mind the head is on a taper so it has a lot of surface area. o well i will keep playing with the idea!
January 22, 201015 yr How minimal is the displacement of a normal bracing size threaded rod? I doubt it would vary the tuning, right?Im liking the idea of these.Well it's just pi*r^2 * length, which for a 3/8" rod about 20" long is only 2.2 cubic inches. I don't think you'd notice that in the sound, haha.? 20" = 20 feet? lol that is alot of rod! the max i will need is about 11.75 which is about 0.00075 ^3 lol as for the wood idea as a brace i am worried b/c right now my box is about 6.1~ at bestat about 40hz (not build yet but soon to be) so with wood i fear it would be to much and i would lose out on cubic volume. but will a flat head screw pull though the mdf? keep in mind the head is on a taper so it has a lot of surface area. o well i will keep playing with the idea!20" = 20 inches20' = 20 feet
January 22, 201015 yr Author ya some nights i am slow! it happens lol! and i also jsut relized he said 2.2 cubic INCHES lol! i guess i was thinking cubic feet lol!!thanks for the correction though!How minimal is the displacement of a normal bracing size threaded rod? I doubt it would vary the tuning, right?Im liking the idea of these.Well it's just pi*r^2 * length, which for a 3/8" rod about 20" long is only 2.2 cubic inches. I don't think you'd notice that in the sound, haha.? 20" = 20 feet? lol that is alot of rod! the max i will need is about 11.75 which is about 0.00075 ^3 lol as for the wood idea as a brace i am worried b/c right now my box is about 6.1~ at bestat about 40hz (not build yet but soon to be) so with wood i fear it would be to much and i would lose out on cubic volume. but will a flat head screw pull though the mdf? keep in mind the head is on a taper so it has a lot of surface area. o well i will keep playing with the idea!20" = 20 inches20' = 20 feet
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