Maticus Posted September 21, 2010 Report Share Posted September 21, 2010 Basically what the topic says. I'd like to change my tuning on my box from it's current state of 45 Hz down to about 32 by adding a screw on external port piece. I need to know how one goes about tuning with part of the port being outside and part inside, like thor's port. Could anyone link me to some other threads, or tell me how to figure it up? Quote Link to comment Share on other sites More sharing options...
anubis Posted September 21, 2010 Report Share Posted September 21, 2010 you have an aero or slot? cuz he has the aero now? Quote 1998 Monte Carlo Z34 Stock HU but have replacement Stock Highs Stock Electrical BTL 18 sitting naked AP1500D Link to comment Share on other sites More sharing options...
Maticus Posted September 21, 2010 Author Report Share Posted September 21, 2010 you have an aero or slot? cuz he has the aero now? I have a simple slot, I was just using him for an example because a large portion of his port is outside of his box. Quote Link to comment Share on other sites More sharing options...
zfrerichs Posted September 21, 2010 Report Share Posted September 21, 2010 you can add external ports to lower tuning Quote Roseville, CA Link to comment Share on other sites More sharing options...
tacomabanga1986 Posted September 21, 2010 Report Share Posted September 21, 2010 i changed my tuning by just inverting my subs, wit mag in box it was loud as hell with around 40 or so hertz music but inverted its the same loudness or louder with the lower 32-36range, i guess without motor displacement its a diff box anywho, dont changeing the port area affect tuening too or how well the box displaces air? cause mine is loud but doesnt push out air like i thought it would anyways hope u get it figured out Quote here's a link to my system 99 toyota tacoma , 2 mtx 8000 1504's in a sealed downfire , 1000w memphis amp here's a link to my other system my 90 geo prizm test car heres a thread i got of new songs u can dl that are legal = Some Good Bangage/you Can Dl These Free And Legit Link to comment Share on other sites More sharing options...
Maticus Posted September 21, 2010 Author Report Share Posted September 21, 2010 i changed my tuning by just inverting my subs, wit mag in box it was loud as hell with around 40 or so hertz music but inverted its the same loudness or louder with the lower 32-36range, i guess without motor displacement its a diff box anywho, dont changeing the port area affect tuening too or how well the box displaces air? cause mine is loud but doesnt push out air like i thought it would anyways hope u get it figured out I'm in a tough enough spot as it is with seating space, I have two 10" L7s behind the seats in a single cab truck, no way could I invert them, and the port I'm running with now is kind on the low side of the "rule of thumb of cubic inches to cubic feet" it's right at 13, so adding a bit of port shouldn't hurt me at all there. Quote Link to comment Share on other sites More sharing options...
zfrerichs Posted September 21, 2010 Report Share Posted September 21, 2010 yes, increasing port area will in return cause the need for the port to be longer to achieve a lower frequency. inverting woofers will increase box volume and lowering the tuning a tad because the ratio between internal airspace and port area has decreased. So lets just put it like this, if you are to invert your woofers it will increase box volume, decrease inches of port per cubic foot, and lower tuning a tad. Quote Roseville, CA Link to comment Share on other sites More sharing options...
Maticus Posted September 21, 2010 Author Report Share Posted September 21, 2010 yes, increasing port area will in return cause the need for the port to be longer to achieve a lower frequency. inverting woofers will increase box volume and lowering the tuning a tad because the ratio between internal airspace and port area has decreased. So lets just put it like this, if you are to invert your woofers it will increase box volume, decrease inches of port per cubic foot, and lower tuning a tad. All I'm really wondering is how can I figure the tuning with part of the port taking up airspace, and the outer portions not? Quote Link to comment Share on other sites More sharing options...
anubis Posted September 21, 2010 Report Share Posted September 21, 2010 just extend the common walls but do well do brace the external portion of the port and youll keep your volume while lowering tuning you measured for Quote 1998 Monte Carlo Z34 Stock HU but have replacement Stock Highs Stock Electrical BTL 18 sitting naked AP1500D Link to comment Share on other sites More sharing options...
zfrerichs Posted September 21, 2010 Report Share Posted September 21, 2010 its the same calculations as before, but now you have extra room to play with on the port instead of making the port longer and shrinking the box. Quote Roseville, CA Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.