Recent content by Lightninghoof

If you are planning on using a sealed box, you'll probably want to choose a driver that will yield a rather low anechoic F3 (lower than 40Hz) in a moderate sized sealed enclosure. Such designs usually feature a mid to high Qes/Qts and low EBP. They will also have a low SPL/sensitivity rating...

I typed this up in a different Type-X thread. Copy and paste: The Type-X is a rather unique subwoofer design that is optimized for a very specific purpose and application. If you understand the design and what it excels at (and consequently what it lacks), it's performance, in-car frequency...

I typed this up in a different Type-X thread. Copy and paste: The Type-X is a rather unique subwoofer design that is optimized for a very specific purpose and application. If you understand the design and what it excels at (and consequently what it lacks), it's performance, in-car frequency...

haha, short attention span

I typed this up last night in a different Type-X thread. Copy and paste: The Type-X is a rather unique subwoofer design that is optimized for a very specific purpose and application. If you understand the design and what it excels at (and consequently what it lacks), it's performance, in-car...

np, I'm glad you got it worked out

Check out this thread: http://www.sounddomain.com/ubbthreads.php?ubb=showflat&Board=11&Number=551110&Searchpage=2&Main=106116&Words=fiberfill&topic=0&Search=true#Post551110

Let me know what you find with your corrected calculations.

6.16 cm = 2.4 in Not following you exactly. I thought you were telling me two 6" ports before. You should definitely try to implement that slot port.

It's a common chamber, 5CF net. (2.5CF net per driver) Stuffed with fiberfill, I estimate effective volume to be 6CF (3CF per driver) Most users would prefer a smaller sealed enclosure for a pair of 12" drivers due to size constraints, but the larger the enclosure, the lower these drivers drop...

Woah, I think you may be doing something wrong in that case. When I plugged in the correct data I was getting port velocity results in the low teens. Right click on the graph and make sure the units of measurement are set properly. You want it set to m/s and to be outputting "peak" velocity...

No I don't have those formulas. Try BassBox Pro and compare its results with WinISD Pro and Unibox. What leads you to believe the WinISD's calculations are off by a large amount?

Yeah, there's no way vent mach would peak at anything close to 120 m/s with 60 square inches of port area. Unibox has a screw loose or something. As far as the port design goes, I was thinking something more along the lines of an MDF slot port. They are easy to construct, easy to bend...

Don't stress over it too much tonight. Drive up there tomorrow and talk to them about the problem. If they listen to it and recognize that there is indeed a problem, they will most likely be able to locate and fix it. I think the wrong thing to do at this point (so early in the...

Jon, I'll let you do most of the final math, but here's what I came up with. According to Dan Wiggins at Adire Audio, you want to try and limit peak air velocity to below 20 m/s at 20Hz. I feel this will depend on your tuning frequency however. You are currently calculating for 60 square...