View Full Version : Box design issues, HELP!

12-13-2012, 10:30 PM
Ok, I followed the tutorial and I thought all was going good until I checked the transfer function magnitude in WinISD.

(2) Infinity Reference 1262w's
Power Handling, RMS 300 W
Frequency Response 23Hz - 400Hz
Nominal Impedance 2 or 8 Ohms
Sensitivity (2.83V @1m) 96 dB
Mounting Cutout Diameter (Metric, English) 11-1/8" (282mm)
Mounting Depth (Metric, English) 6-7/16" (314mm)
Vas (liters) 80.14
Fs (Hz) 25
Qts 0.46
Xmax (millimeters) 13

Single square/rectangular port box, 4 ft/3 tuned for 34 Hz
3/4" MDF 45 x 16 x 16.5
Inner dimensions: 43.5 x 14.5 x 14
Port dimensions: 14.5 x 4.13 x 30.51 = 1805.5 in/3

When I run the numbers it comes up with a peak @ 168Hz!! What did I do wrong or skip? Bad math? Please help.

Also, I'd like to do the numbers for a center port if at all possible. Thanks

12-14-2012, 02:11 PM
screenshot please

Full Tilt
12-14-2012, 02:15 PM
Be sure all of your entered values are correct. The first time I tried designing a box, WinISD said it'd be tuned at 81 hz. I later found out that I mis-entered one of my port dimensions.

12-14-2012, 04:43 PM
screenshot please

I'll have to re run the program, my wife shut down the computer and I'm sure I didnt save everything. DOH!

12-14-2012, 07:18 PM


12-14-2012, 07:29 PM
OK, I went back and re-entered the sub parameters but this 34Hz tune came out to peak at 45Hz, is that ok?