W3BL4Z3D4NK Posted March 23, 2019 Report Posted March 23, 2019 So I'm building a common chamber box for two of the new Alpine R series D4 12" subs and wanted to know what you guys think. I believe it's all planned out to recommended specs but I didnt have any 3/4 laying around so I'm just using some 5/8 MDF Here are the specs 32Wx15Hx16D For an internal volume of 3.4cf after woofer displacement of .1 per sub (so .2 total) but before port displacement which I'm having trouble calculating.. Port is 3.25W (3-1/4) for 14.5" from the front of the box towards the back and splits to each side at 1.63W (1-5/8) for 11" for a total port length of 25.5" It should be tuned at 35Hz I believe Does this sound correct?
W3BL4Z3D4NK Posted March 23, 2019 Author Report Posted March 23, 2019 36 minutes ago, DiBo said: ⅝ MDF is very flexible. Brace well. But are the specs good? Haven't glued it yet just wanna get some input first.
Triticum Agricolam Posted March 23, 2019 Report Posted March 23, 2019 How much power are you running? "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
DiBo Posted March 23, 2019 Report Posted March 23, 2019 26 minutes ago, W3BL4Z3D4NK said: But are the specs good? Haven't glued it yet just wanna get some input first. Specs are off. I'm getting 2.86ft³ before woofer displacement. 32x15x16 Port would be 13¾x 3.25x25.5 2 common port walls ( center port) .625 baffle .625 port thickness .625 material =3.61 gross volume 44.69 port area, 15.62 port area/foot Net volume 2.86ft³ before woofer displacement.
W3BL4Z3D4NK Posted March 23, 2019 Author Report Posted March 23, 2019 22 minutes ago, DiBo said: Specs are off. I'm getting 2.86ft³ before woofer displacement. 32x15x16 Port would be 13¾x 3.25x25.5 2 common port walls ( center port) .625 baffle .625 port thickness .625 material =3.61 gross volume 44.69 port area, 15.62 port area/foot Net volume 2.86ft³ before woofer displacement. Okay well they call for 1 to 1.5cf per sub so that's still within specs tho at 1.33 each after woofer displacement. Should be good right? Port and tuning sound correct?
W3BL4Z3D4NK Posted March 23, 2019 Author Report Posted March 23, 2019 Here's the spec sheet on the woofer. It's the numbers on the right for the 12"
W3BL4Z3D4NK Posted March 23, 2019 Author Report Posted March 23, 2019 10 minutes ago, DiBo said: Tuning would be 37.22hz+/- What length would I need for 35hz?
W3BL4Z3D4NK Posted March 23, 2019 Author Report Posted March 23, 2019 11 minutes ago, DiBo said: Tuning would be 37.22hz+/- How are you calculating all of this? Direct math or a box building calc?
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