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New member Username: Spyder22Post Number: 9 Registered: Mar-07 | I have a one 12 in. Alpine Type E subwoofer. I want to build a box myself. I will build a sealed box made from 3/4 inch plywood. My problem is i dont know what size i should make the box. Can anyone help me out and tell me what i need to do to build the correct size box for my sub. The specs for the sub are listed below..... SPECIFICATIONS Power Handling • Power Handling Capacity (Peak) : 750W • Power Handling Capacity (RMS) : 250W General • Diaphragm Material : Kevlar Reinforced Pulp • Spider Material : Dual Oversized Nomex • Voice Coil Diameter : 38mm • Mounting Depth (top mount) : 159mm (6.4") • Mounting Diameter (top mount) : 274mm (11") • Magnetic Weight : 64oz. • Recommended Box Types : Sealed/Bandpass • Recommended Sealed Box Volume : 0.6 - 1.25 cu. ft. Thiel Small Parameters • Impedance (Nominal) : 4 ohm • Frequency Response : 28Hz - 1kHz • Sensitivity : 89 dB/W/M • D.C.Coil Resistance (Re) : 3.6 ohm • Inductance (Le) : 2.78mH at 1kHz (0.8mH at 20kHz) • Free Air Resonance (Fs) : 31Hz • Equivalent Suspension Stiffness (Vas) : 61 liters(2.3cu.ft.) • Mechanical Q (Qms) : 9.68 • Electrical Q (Qes) : 0.70 • Total Loudspeaker Q (Qts) : 0.66 • Linear Excursion (X linear) : 11.7mm • Maximum Excursion (X peak) : 23.4mm • Mechanical Excursion (Peak-to-Peak) : 40mm • Gap Height (Hag) : 10mm • Coil Height (Hvc) : 33.4mm • Cone Area (Sd) : 490.87 sq. cm |
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Silver Member Username: The_image_dynamicSan Diego Post Number: 522 Registered: Dec-06 | This will be the first of dozens of "don't use plywood" posts. Use MDF and search for free box building programs online, or get one of the guys here to build you a box. We have at least 3 resident box-builders. |
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Gold Member Username: JohnfiacIL My wangers b... Post Number: 1847 Registered: Mar-06 | why plywood? Recommended Sealed Box Volume : 0.6 - 1.25 cu. ft. Plywood might give you problems.. im not sure but IMO go with mdf or birch or somthing. |
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Gold Member Username: Mr_keboAlbertville, Al USA Post Number: 1330 Registered: Nov-04 | most birch you will buy is actually a plywood like i use a 13ply birch sheet |
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Bronze Member Username: Spyder22Post Number: 13 Registered: Mar-07 | Thanks for the info. How do you figure out the box volume? |
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Gold Member Username: JohnfiacIL My wangers b... Post Number: 1848 Registered: Mar-06 | nvm i was thinking of particle wood for some reason lol, to get the box volume you do lengthxwidthxhieght (interior measurements) if you measure form the outside you need to subtract the wood thickness from all sides... also you need to figure out the displacment of the sub... and make the box big enough so the size is right after the sub is added. and if you port the box... more displacments to add |
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Silver Member Username: Smoke05Tucson, Arizona U.S. Post Number: 161 Registered: Jan-07 | http://www.the12volt.com/ http://www.subwoofertools.com/forum/ported-box.asp?Ew=33&Eh=14&Dia=6&Xmax=10.2&V d=0.07&NumW=2&Vb=3.0&Fb=35&Qts=&Vas=&Fs=&CE=0 some good links it may help you... |
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Gold Member Username: BernymacCambodian Post Number: 2207 Registered: Sep-04 | go to www.cruthfield.com , if you look around for one of their tutorials on how to make a box. they made a box for a sealed type E, but i think it was a 10 inch. but you can go there and get an idea or w/e. fasho. |
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Bronze Member Username: Rob1083Post Number: 20 Registered: Mar-07 | just make it 13x13x13, use 3/4 mdf and seal if up well. |
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Bronze Member Username: Rob1083Post Number: 21 Registered: Mar-07 | ^^^that's assuming they include speaker displacemt in there reccommended size |
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Bronze Member Username: Spyder22Post Number: 17 Registered: Mar-07 | i actually just got done an hour ago 14x14x14 perfect fit, hookin the amp and radio up tommrow. |