Box design issues, HELP!

[ZO6killinsbf 10+ year member]

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

Click to read more...

 

[mklett33 10+ year member]

screenshot please

 

[Full Tilt 10+ year member]

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.

 

[ZO6killinsbf 10+ year member]

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!

 

[ZO6killinsbf 10+ year member]

This?

 

[ZO6killinsbf 10+ year member]

OK, I went back and re-entered the sub parameters but this 34Hz tune came out to peak at 45Hz, is that ok?