Clif Posted November 14, 2008 Report Share Posted November 14, 2008 So im going to get into T-line boxes so i can teach my self and others about them. My set up. 2 RE SE 10" woofers. Few Calculations: 2 10“ subs 78.5 sq in x 2 = 157 sq inchs 200sq inches tapering down to 157 sq inch with the last 20 inches of port all 157sq inches fs is 26.6 x .25= 6.65’ = 79.8” of port I came up with a few desings then relized there not to practical for my situation. Im putting them in a suv so im thinking subs up port back. From what i herd that seems to work pretty well with subs in suvs. Now here come a question or 2. how exact should i be with the length and width of my port? Do i calculate where my subs mount as part of my vent or calculate it from the first turn?(or from the last sub in the vent) will 45s in the corners or should i use resign to round them off? Any other helpfull tidbits? Cliff Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
Forevrbumpn Posted November 14, 2008 Report Share Posted November 14, 2008 Thats where the whole quarter wave calculation comes in 30hz = 9.41ft long find the Fs of the subs, or what you want to use, and find the quarterwave length of that number Quote I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy. Link to comment Share on other sites More sharing options...
Clif Posted November 14, 2008 Author Report Share Posted November 14, 2008 yea fs of 26.6 quarter wave of that i think should be 6.65 ft or 79" is that correct? Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
Clif Posted November 14, 2008 Author Report Share Posted November 14, 2008 well by doing your formula 1160/26.6=42.48/4= 10.62ft i get that is that the correct way to do it? i herd take the fs and times it by .25? is this just the cheap and easy way? Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
Clif Posted November 14, 2008 Author Report Share Posted November 14, 2008 k im dumb re did it and have 10.62 ft of port along with 70sq inchs for each sub or 140 for both. Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
Forevrbumpn Posted November 14, 2008 Report Share Posted November 14, 2008 just curious, what altitude are you? I know if well over 1000ft, the whole formula changes some Quote I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy. Link to comment Share on other sites More sharing options...
Clif Posted November 14, 2008 Author Report Share Posted November 14, 2008 google earth said around 1040ft for st. cloud mn Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
aznboi3644 Posted November 14, 2008 Report Share Posted November 14, 2008 well by doing your formula 1160/26.6=42.48/4= 10.62ft i get thatis that the correct way to do it? i herd take the fs and times it by .25? is this just the cheap and easy way? lol take fs and multiply by .25???? fs is the frequency measured in Hz...multiplying Hz times .25 does give you length. Quote Link to comment Share on other sites More sharing options...
Forevrbumpn Posted November 14, 2008 Report Share Posted November 14, 2008 I knew that x's 0.25 looked odd 30hz = 9.41ft long at sea level, not 7.5ft long as the x's 0.25 would be nice if the numbers got shorter like that Take Fs, 25hz x's 4 = 100 now take spd of sound 1130ft sec / 100 = 11.3ft long Quote I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy. Link to comment Share on other sites More sharing options...
Clif Posted December 22, 2008 Author Report Share Posted December 22, 2008 (edited) so make it 10.62 ft long 1130/26.6=42.48 42.48/4= 10.62 Also the effective piston area is 48.05 (96.1 for 2) should i do a strait port design or start a lil smaller like 90 and finsh at like 105? also do you just put a V in the box in the first vent for multiple subs? Edited December 22, 2008 by Clif Quote 03 Trailblazer EXT LT In Dash Rear Flip Down Polk Audio Font & Rear Stage Hifonics Zeus 4 Chan Amp Hifonics Brutus Mono Amp 12" Rockford Fosgate Power HX2 T-Line tuned to 45hz 18"BTL T-line @31Hz (9 weeks pregnant) Link to comment Share on other sites More sharing options...
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