Wierd Box Resonation
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New member Username: SterrettPost Number: 1 Registered: May-07 | I have 2 Fi BL 12's pushed by 2 strapped Alphasonic pma1200da amps in a ported 2.5 ft^3 box tuned at 34hz. I am getting a wierd reverberation from tunes that are higher in the scale. My frequency on the amp is set at 80 HZ. This is my first ported box, my smallest lowest powered system, and the first one in a daily driver...so there are too many varriable that I have no experience with to pinpoint the problem. Do I need to stuff the box, retune the port, or live with it? Thanks for any advice. It is a small problem and only noticable if you are listening for it, but I want it gone  DJ |
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Silver Member Username: •cam•Post Number: 226 Registered: Nov-06 | they're each in 2.5 cubes right? so 5 cubes total? well i built my first box out of plywood and i had the same problem so i redesigned it and built it out of mdf and the resonating was gone. |
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New member Username: SterrettPost Number: 2 Registered: May-07 | Its made out of 5/8 mdf...and no its 2.5 total (inside volume)...its in the trunk a a lancer evo...its as big as I could go. THe trunk won't open now as it is. |
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Silver Member Username: •cam•Post Number: 233 Registered: Nov-06 | that sounds small as hell. you got pics of your evo? what generation? wait for someone with more experience to figure out why you got resonance problems tho. |
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Silver Member Username: RenegadesrunLafayette, IN US Post Number: 779 Registered: Oct-04 | 80hz? Try 50-55hz. |
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Gold Member Username: Matt12490California USA Post Number: 2367 Registered: May-05 | You need to sell one of your subs and only have a 1 12" setup.. Or you can keep the box, sell the subs, and get 10s. 2.5 total for 2 BL 12s is waaaaaaaaaaaaaaaaay too small |
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New member Username: SterrettPost Number: 3 Registered: May-07 | My evo is a 2003 VIII...I don't have any pictures as it is just my daily driver...nothing too special...mostly stock with a few minor engine mods and some ecu work.....The box is small, but not too aweful small...it sounds pretty good (except for the little resonation)it dosen't low as it should, but that is the trade off for keeping the back seat. |
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Gold Member Username: JblanfordPost Number: 1036 Registered: Oct-06 | "The box is small, but not too aweful small" if its 2.5 cuft its too small for 2 12"s build a new box |
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Gold Member Username: JblanfordPost Number: 1037 Registered: Oct-06 | ahh didn't your second post... reading > me |
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New member Username: SterrettPost Number: 4 Registered: May-07 | For what it is worth I have a show car that I put most of my extra cash in...don't laugh, but it is an older body style Hyundai Tiberon. I have done some extensive work to it...turbo..exhaust...lowered...it has no back seat and 8 JLW6V2 12's and 8 500W slash amps in it...I actually probably wouldn't be able to tell if it resonates or not |
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Platinum Member Username: BestmankindLos Angeles, CA USA Post Number: 12809 Registered: Oct-05 | pics of the tiburon. please. |
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Gold Member Username: JblanfordPost Number: 1039 Registered: Oct-06 | wait...wtf ? you just said you have 2 12" bl's |
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Silver Member Username: •cam•Post Number: 239 Registered: Nov-06 | dif cars man. |
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Gold Member Username: JblanfordPost Number: 1041 Registered: Oct-06 | F@CK !!!.. reading is pwning me today |
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New member Username: SterrettPost Number: 5 Registered: May-07 | I understand that the box is too small...by about .6-1 ft^3 according to FI specs...pretty sure that that wouldn't cause resonance...it would just effect the output frequency (ie it won't go as low as it should) I have been wrong before though...but I knew this when building it...I built it to fit the trunk...My calculations could be off on volume as it is not a perfect cube and has some angles that extend into the spare well and under the rear strut bar...the 2.5ft^3 was my low end estimate it is probably closer to 2.9 ft^3 but I didnt want to do calculus and it didn't really matter because it is physically impossble to make it bigger without modifying the structure of the trunk.. |
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Silver Member Username: J_c_wheeler8Columbus, IN United States Post Number: 499 Registered: May-06 | Trade a me a BL for a custom box ;)? lol, j/k. If u want though, I could build you a custom box for one of those BL's, that way U could get better bump and not be pressed for space. Also, add some polyfill to that, trick the woofer into thinkin the box is 25% bigger. |
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Gold Member Username: JblanfordPost Number: 1042 Registered: Oct-06 | don't get a box from him  |
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Gold Member Username: JblanfordPost Number: 1043 Registered: Oct-06 | ^^^why do that ? build another box |
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Silver Member Username: Skibum12189Cleveland Post Number: 555 Registered: Mar-06 | i love evos |
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Silver Member Username: J_c_wheeler8Columbus, IN United States Post Number: 504 Registered: May-06 | "don't get a box from him " Wtf? Who are you to tell him to not buy a box from me. You wont beat my price and I dont do a sh!tty job. |
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Silver Member Username: RenegadesrunLafayette, IN US Post Number: 780 Registered: Oct-04 | I must have replied in the wrong thread, i was looking for the fella that said..... "Hey guys, im gonna tune my subs within 10hz of wtf my highs should be, then ask you why it sounds like sh!t in a box thats admittedly too small." My bad. |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 2813 Registered: Jan-06 | Usually if you get a weird high frequency rattle-like sound means a loose panel, something may have broken loose. I had a box that was breaking loose in one certain spot, only made noise at certain frequency, irritating to say the least. Polo.. |
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New member Username: SterrettPost Number: 6 Registered: May-07 | "Hey guys, im gonna tune my subs within 10hz of wtf my highs should be, then ask you why it sounds like sh!t in a box thats admittedly too small." My bad...the box is tuned at 34Hz the LPF is 80hz....I apologize for my apparent miscommunication and your apparent inability to read. Have a nice day And I never said it sounded like sh!t...its just a little issue and I thought that some one could add some helpful advice....thank you for your negativity. |
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