Help with box for dd
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 219 Registered: Sep-06 | i am tryin to figure out the specs (volume and tunning)for this box i keep gettin asked and i dont know please help. the box is 12" deep.. 40" long..16" high/tall.. the port is 4" wide.. 14.5"' high'tall, then the port goes 11" deep bends right and goes 17" more right. i tried drawing it in paint but it wouldnt load. box is made of 3/4 mdf. |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 220 Registered: Sep-06 | bump |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 221 Registered: Sep-06 | i want to try and find out after port and sub diplacement sub is dd 3512 and made out of 3/4 mdf |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1400 Registered: Nov-05 | Total: 4.444cu.ft Vb: 3.019cu.ft (before sub displacement) Fb: 39.24hz (before sub displacement) I would have done 2.5cu.ft tuned to 35hz myself but 40hz is what DD recommends, box size is too big IMO. |
|
Gold Member Username: Basshead86Try Google Post Number: 7799 Registered: Aug-05 | Box is 2.45 cubes before sub displacement. so prob like 2.2-3 cubes after sub.  tuned to ~40hz here is as close to your box as i can get it http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=16&Dia=6&Xmax=26&Vd= .16&NumW=1&Vb=2.29&Fb=41&Qts=&Vas=&Fs=&CE=0 |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 223 Registered: Sep-06 | any1? |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1401 Registered: Nov-05 | ****EDIT**** Sorry, I messed up. Always forget to make sure its external dimensions.. For the dimensions you gave being external.. Total: 3.392cu.ft Vb: 2.004cu.ft (before sub displacement) Fb: 48.67hz (before sub displacement) Tuning frequency is too high.. would be good for SPL but not much of anything else. |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 226 Registered: Sep-06 | muddy why are you and kevin's so different? |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1402 Registered: Nov-05 | No clue... first one I posted was for the dimenions you gave but being internal measurements. For external measurements the second one is accurate. I used Bass Box Pro 6.. |
|
Gold Member Username: Basshead86Try Google Post Number: 7801 Registered: Aug-05 | b/c i took into account the box's volume AFTER port displacement. the port isn't airspace for the sub, it is simply a port. the sub is seeing ~2.29 cubes of airspace, and b/c the port is huge, it takes up the rest of that 3.39 cubes. the port has .93 cubes of airspace alone |
|
Gold Member Username: Basshead86Try Google Post Number: 7802 Registered: Aug-05 | i figured up the box's internal volume, and then the port's internal volume, subtracted it from internal, and that is what the sub is getting. then i fugged with the Xmax and tuning until i got 58sq.in. of Port area and a 4" wide port and ~28in. long. and there is your box. http://www.subwoofertools.com/forum/ported-box.asp?Ew=40&Eh=16&Dia=6&Xmax=26&Vd= .16&NumW=1&Vb=2.29&Fb=41&Qts=&Vas=&Fs=&CE=0 |
|
Gold Member Username: Basshead86Try Google Post Number: 7803 Registered: Aug-05 | did you measure the port lenght from the PIECES of the port wall, or from the exact middle of the port all the way through?? |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 227 Registered: Sep-06 | is this a good box for my sub what could be better, whats wrong with it? |
|
Gold Member Username: Basshead86Try Google Post Number: 7804 Registered: Aug-05 | there is nothing wrong with it. lol does it sound good to you??? that is all that matters. DD recommends 40hz tuning, and you have it, or close to it. so be happy |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 228 Registered: Sep-06 | i measured it from the wall to the end of the port wall. 17". from the front of the wood to the back wall 11". 4" wide all the way through. it sounds great and it hit a good number 141.05 so im happy, but who is ever satisfied, lol. |
|
Gold Member Username: Basshead86Try Google Post Number: 7806 Registered: Aug-05 | then it is as close to your tuning as i can get it one day, you will get tired of bass(one day), and you will opt for something that isn't as loud an sound very clean and clear, cleaner and clearer than anything you have experienced before, and that will be the system you keep forever lol |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 229 Registered: Sep-06 | have u been metered? also do you hit higher numbers on the windshield or the kick? what do they do at actual comps? oh and where did u find the xmax? im tryna learn how you did this |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1404 Registered: Nov-05 | Muddy.. mine was done with port displacement as well.. Hence the: Total: (total box volume) Vb: (after port displacement) Caclulations were made using .75 for port walls and box walls. The port measurements you gave will change what we both said. When asked the port length we meant the actualy length of the port.. in your case how long the wood was that created the L shape |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 233 Registered: Sep-06 | have u been metered? also do you hit higher numbers on the windshield or the kick? what do they do at actual comps? oh and where did u find the xmax? im tryna learn how you did this |
|
Gold Member Username: Basshead86Try Google Post Number: 7811 Registered: Aug-05 | i did: the internal volume minus the port. minus sub displacement. then i got 58sq.in. of port area. and matched up the length of the walls ...not center diameter like you are supposed to do, but he gave me the measurements i could work with, and i got 41hz....sooo to each their own?? lol i increased the Xmax until i got the port area i wanted in that program. your Xmax is closer to 16-19mm |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1405 Registered: Nov-05 | for internal dimensions this was what i posted.. Total: 4.444cu.ft Vb: 3.019cu.ft (before sub displacement) Fb: 39.24hz (before sub displacement) for external it was completely different |
|
Gold Member Username: Basshead86Try Google Post Number: 7816 Registered: Aug-05 | this is going nowhere...... |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1406 Registered: Nov-05 | it is.. what im saying is my calculations and yours were similar when i used the internal dimensions for what he gave.. anyway.. like muddy said.. if you like it who cares what the specs are... |
|
Gold Member Username: Basshead86Try Google Post Number: 7818 Registered: Aug-05 | exactly. lol |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 234 Registered: Sep-06 | thanx guys sorry to make an argument. muddy have u been metered? also do you hit higher numbers on the windshield or the kick? what do they do at actual comps? |
|
Gold Member Username: FrkkevinLake Worth, Texas US Post Number: 1407 Registered: Nov-05 | highers numbers on the kick... legal your numbers will be lower.. (windows up.. doors closed) .. outlaw your numbers will be higher windows or doors open |
|
Gold Member Username: Basshead86Try Google Post Number: 7821 Registered: Aug-05 | no i havent had the chance to have mine metered. i was at a local get together a LONG time ago, but didn't have enough time to get mine metered before work. lol |
|
Silver Member Username: RvlacosEl Paso, T.X. United States Post Number: 235 Registered: Sep-06 | thats how i got metered all window and doors closed and they put the tl meter on the windshield. i guess the shop i go to knows what theyre doin |
Main Forums
Today's Posts- Home Audio Forum
- Home Video Forum
- Home Theater Forum
- Car Audio Forum
- Accessories Forum
- All Forum Topics