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New member Username: William9000Madisonville, Kenntucky USA Post Number: 3 Registered: Apr-10 | Ok I have decided to build my own sub box for two Kicker CompVR 07CVR122. I wouuld like to get SPL over SQ from my box with aesthetic appeal coming in a close second. I want to know if a fiberglass container is inferior in sound to a fiberboard/plywood box. Also it is my understanding that I want a ported enclosure over a sealed one. Is This correct? |
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Platinum Member Username: GlasswolfColumbia, SC USA Post Number: 12809 Registered: Dec-03 | well yes if you just want it loud but musical, go with sealed. as for MDF vs glass, a lot depends on how many layers of FG you use, vs the thickness of the MDF. Generally, fiberglass will flex more, so it's not ideal for audio enclosures, but it is used because you can shape it nearly any way you want. If you want loud and not flexy, go with 3/4" MDF or HDF fiberboard. Also if you want flat out SPL, go with a 6th order bandpass enclosure, and tune it to about 55-65Hz. You'll gain about +15dB. |
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New member Username: William9000Madisonville, Kenntucky USA Post Number: 4 Registered: Apr-10 | Thanks Glasswolf I'm interested in the 6th order design but my specs wont plug in to any online calculators because my qts is to high. Here are my specs 2 x Size 12 -inch Impedance 2 ohms Cone Material Injection molded poly Surround Material Santoprene rubber Sealed Box Volume (cubic feet) 1 - 4.6 Ported Box Volume (cubic feet) 1.75 - 2.25 Port diameter (inches) N/A Port length (inches) N/A Free-Air No Dual Voice Coil Yes Sensitivity 86.7 dB at 1 volt Frequency Response 25 - 500 Hz RMS Power Range (Watts) 50-400 Peak Power Handling (Watts) 800 Top Mount Depth (inches) 6 1/4 Bottom Mount Depth (inches) N/A Cutout Diameter or Length (inches) 11 1/16 Vas (liters) 95.37 Fs (Hz) 26.1 Qts 0.527 Xmax (millimeters) 12.64 can you help me figure out the dimensions I need? |
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Gold Member Username: SouthernrebelMonroe, Louisiana Team Audible... Post Number: 7957 Registered: Mar-04 | In a '99 Jeep Grand Cherokee w/ 2 CVR12's, I would just go w/ a 4.5cuft ported box tuned ~35-38hz. That will get you relatively loud and still sound pretty good for daily bass. |
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Bronze Member Username: CwruckPost Number: 93 Registered: Feb-10 | ya i definitely agree with canaan, while glasswolf is correct in tuning to 55-65 hz for spl, that would only be useful if your using the box for a competition. because once you start playing tones below the tuning, your going to run into problems and have blown subs very quickly. so go with 4.5 cu ft tuned 35 hz and you can bump everyday and not worry |
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New member Username: William9000Madisonville, Kenntucky USA Post Number: 5 Registered: Apr-10 | Thanks so Much guys for the prompt response! |
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New member Username: William9000Madisonville, Kenntucky USA Post Number: 6 Registered: Apr-10 | Bear with me as I'm a newbie and cant seem to figure out these ?*&^ calculators. How do I figure out the dimension of said box using the information you guys gave me. Is it just 4.5 cubic feet in any rectangle shape or can I make a box that wedge or another custom shape.Thanks again this forum has been most helpful. |
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Platinum Member Username: GlasswolfColumbia, SC USA Post Number: 12814 Registered: Dec-03 | I did make one type.. sorry. I meant to say if you wanted loud and musical, go ported. I'd just woken up and my head was fuzzy from this horrid pollen we have right now. Anyway, if you really need it loud, and you decide a ported box isn't cutting it, look at 3rd order bandpass, and tune it around 45-50Hz. It'll really sound boomy, and it won't hit deep, but it will have a crapload of impact, and it will be loud.. probably +3 to +5dB over ported. Personally if you want this for music, I'd just go with a large ported enclosure.. give each sub 2.5 to 2.7cu ft, and use a single 4" aero-port for each sub. Use a shared airspace in the enclosure, and make sure it's well built.. sealed around the ports and terminals, and braced internally to resist flexation. Tune the ports to 34Hz for twelves. That will give a very good, well rounded box that hits pretty loud, and very low. be sure to enable teh subsonic filter on teh sub amp and set it @ 34Hz too. This will protect the subs from unloading. |
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New member Username: William9000Madisonville, Kenntucky USA Post Number: 7 Registered: Apr-10 | goin insane here trying to figure out how to tune my ports!any help would be appreciated! |
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Platinum Member Username: GlasswolfColumbia, SC USA Post Number: 12825 Registered: Dec-03 | http://www.bcae1.com/ has calculators for port tuning. it's based on enclosure volume (after port and driver displacement), port inner diameter, and port length to derive the tuned frequency. |
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New member Username: William9000Madisonville, Kenntucky USA Post Number: 8 Registered: Apr-10 | That has to be the most informative site on the net thanks Glasswolf |