posted
It looks pretty good but I would tune it a bit higher for 2 reasons. 1) That box will allow the sub to over excurt from about 22Hz thru 30Hz. 2) I designed and built a 4th order BP for a friend with a single older pioneer, tuned to 53Hz, it didn't start to come alive until it got down to ~35Hz ... was really strong at ~25Hz. I've never used WinISD but I know BB6 usually shows the "in car response" about 10Hz higher, so if it says it will peak from 40Hz to 50Hz it will usually be 30Hz to 40Hz. I modeled up one for you (lime green) and added yours (violet) for comparison. Mine is: Chamber 1 - lower-freq. Vb = 1.094 cu.ft Fb = 55 Hz F3 = 38.08 Hz Fill = none Chamber 2 - upper-freq. Vb = 1.25 cu.ft Fb = 59.5 Hz F3 = 93.64 Hz Fill = none No. of Vents = 1 Vent shape = other Vent ends = one flush Av = 36 sq.in Lv = 16.94 in
posted
The frequency response graph on my WinISD Pro looks nothing like what you posted for your box suggestion. For the out-of-car response there is a 7 db peak centered at 63hz. Do I want that??? I usually cross my sub over around there.
posted
I dont use winisd so I cant see the 7db peak you're talking about but BB6 pro says it's relatively flat from ~49Hz to ~70Hz which incar usually shifts down about 10Hz so you can figure it's flat from ~39Hz to ~69Hz. Do what you want. I dont know how acurate winisd is but I know BB6 is acurate. Was just trying to help out.
Posts: 12 | From: Phoenix, AZ | Registered: Sep 2003
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