Members Deville Posted August 6, 2005 Members Share Posted August 6, 2005 I have an Eminence Magnum 15LF speaker, and I was trying to figure out, using WinISD, the size of the ideal cab for it to achieve maximum depth and SPL. In order to create a cab with perfectly flat frequency response from 40Hz (-3dB @ 30Hz), it calls for a vented cab that stands as tall as my current 1x15 and 2x10 together. After some conversion, it comes out to 26.3" wide, 41" High, and 16.5" Deep. Does this sound right, or could it be trimmed down? Here are the specs:http://www.partsexpress.com/pdf/290-580.pdf Thanks in advance for any assistance you can provide. Link to comment Share on other sites More sharing options...
Members burdizzos Posted August 6, 2005 Members Share Posted August 6, 2005 That's right. It wouldn't sound bad if you built it to 5 cubic feet and tuned it to 30 Hz. That gives you a -3 dB point of 40 Hz and -6 at 30. It's also a reasonably sized cab that will have more low end than most cabs on the market. Link to comment Share on other sites More sharing options...
Members Deville Posted August 6, 2005 Author Members Share Posted August 6, 2005 Thanks, Burdizzos. Knew I could count on you. So when you say tune the cab to 30Hz, you just mean build the cab per my dimentions, and adjust the size of the port... right? What's the math operation to determine dimentions when you give me a cab volume in cubic feet? Link to comment Share on other sites More sharing options...
Members burdizzos Posted August 6, 2005 Members Share Posted August 6, 2005 There's a cab calculator in ISD. Just punch in 5 cubic feet and 30 Hz as the tuning frequency. Then hit the "box shape" button. I'm looking at a box that is 26.5" high, 24" wide and 17" deep. Add two 3" diameter ports, six inches long and you're in business. Link to comment Share on other sites More sharing options...
Members Deville Posted August 7, 2005 Author Members Share Posted August 7, 2005 Hey Burdizzos, In WinISD, at the Vents screen where you specify the number of ports, length, and diameter, what is vent mach? Is it important? I imagine it has to go green before you can achieve proper tuning. Link to comment Share on other sites More sharing options...
Members burdizzos Posted August 7, 2005 Members Share Posted August 7, 2005 Apparently, if the vent match is red, the air speed thought the vent could be too fast, resulting in port noise. Knucklehead built a 1x15 cab with a tiny port such that the front baffle thickness would cover the required port depth and he didn't have an port noise issues. I'f say that if it's around .3 or lower, you'll be fine. Link to comment Share on other sites More sharing options...
Members Deville Posted August 7, 2005 Author Members Share Posted August 7, 2005 Sweet. .12 Thank you. Link to comment Share on other sites More sharing options...
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