OldsBoomer Posted September 14, 2010 Report Share Posted September 14, 2010 well considering my blowthru is designed like this just sideways with 4 12's abd i peak at 35 hz i tunned it to about 31hz with doing it the way i told him to do. My box EXACTLY what it was designed to do like every other box i've done does. And yes the tunning will be affected because of the way the subs will interact with the port and the air movemen butit really seems like your trying to make this more complicated then it has to be. perssonally i dont know what your overall volumes after displacement is but i'd try making the mouth of the port a little smaller, that'll help with tunning Quote Suburban Coming Soon Link to comment Share on other sites More sharing options...
berniebp87 Posted September 18, 2010 Author Report Share Posted September 18, 2010 Thanks Oldsboomer! But is there another design that is more efficient than this? diamond or a tunnel maybe? The subs where sent from italy a couple of day ago and I got about a week until they are here so I wanna be sure that the design I use is the most efficient Quote Proud member of SMD My build log 2 DDZ9518 2 DynaBel BF 8501 2 GZ Neo 8"s 154.5@38hz with 2 DD Z9518`s 145.5@40hz with 2 DD 1508`s My youtube vids Link to comment Share on other sites More sharing options...
BITLD Posted September 18, 2010 Report Share Posted September 18, 2010 (edited) Calculating the tuning is somewhat a challange with clamshells. The clam angles themself act like what I would call 'phantom port length' it will have an effect on the end tuning. Without running your numbers If your going for 35Hz tuning then thats a good one. Frankies was tuned around 30Hz about the same as mine. Are you getting a good deal on those drivers? Holla at me, we can work something out Edit: noticed you got them already. Good luck! Edited September 18, 2010 by BITLD Quote www.BladeICE.com UK/European Distributors Ascendant Audio Fi Car Audio XS Power KnuKonceptz.co.uk Facebook Youtube Channel Link to comment Share on other sites More sharing options...
berniebp87 Posted September 18, 2010 Author Report Share Posted September 18, 2010 Calculating the tuning is somewhat a challange with clamshells. The clam angles themself act like what I would call 'phantom port length' it will have an effect on the end tuning. Without running your numbers If your going for 35Hz tuning then thats a good one. Frankies was tuned around 30Hz about the same as mine. Are you getting a good deal on those drivers? Holla at me, we can work something out Edit: noticed you got them already. Good luck! You got mail you tease, lol Quote Proud member of SMD My build log 2 DDZ9518 2 DynaBel BF 8501 2 GZ Neo 8"s 154.5@38hz with 2 DD Z9518`s 145.5@40hz with 2 DD 1508`s My youtube vids Link to comment Share on other sites More sharing options...
Colin - STAPUFT Posted September 19, 2010 Report Share Posted September 19, 2010 12 12"s won't work..... doesn't sound good, especially in a clamshell. Nahhh I'm just yankin' you. Listen to Boom and to Blade Ice. They have done this more than once. I had these SAME questions as you when I built my clamshell, and yes- I initially tried to use ported box design to build the box -and I did to a degree- it got me in the ball park. I Thought I tuned my box to around 35 hz. I THOUGHT. Much much much lower. Clamshells are tricky like that, but nothing like the visual wow factor. Tuned in! Quote 12 - 12"s in the STAY PUFT 1989 Chevy Astro Build & Comment Log Un-Interrupted Build LogYouTube Channel Chevy Trailblazer 5.1 Dolby Digital DTS Install You have a beard of a mysterious sea captain. I would follow you to hell and back. Link to comment Share on other sites More sharing options...
berniebp87 Posted September 19, 2010 Author Report Share Posted September 19, 2010 Thanks man! I think I got to do some Trail and error as dwright27 said And when building a wall, either your standard ported one or a clamshell, tuning is gonna change a bit (usually drops a few hz down) so I think I gonna tune it a tad higher on the calculator and rather adjust it after if it`s needed Quote Proud member of SMD My build log 2 DDZ9518 2 DynaBel BF 8501 2 GZ Neo 8"s 154.5@38hz with 2 DD Z9518`s 145.5@40hz with 2 DD 1508`s My youtube vids Link to comment Share on other sites More sharing options...
Colin - STAPUFT Posted September 19, 2010 Report Share Posted September 19, 2010 That's the way to go imo. You can always close up the port/terminus some to lower the tuning if you need to. Just don't choke it up too much- but I don't see that being a problem. Now... get busy!! Quote 12 - 12"s in the STAY PUFT 1989 Chevy Astro Build & Comment Log Un-Interrupted Build LogYouTube Channel Chevy Trailblazer 5.1 Dolby Digital DTS Install You have a beard of a mysterious sea captain. I would follow you to hell and back. Link to comment Share on other sites More sharing options...
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