while i didn't plug the numbers into Unibox, the graph looks as it should for a ported enclosure. I think the "dip" you are referring to is the one of the graph labeled "SPL of the Driver"...you want to look at SPLtot
Originally Posted by vitod /forum/post/0
The response looks good except that nasty dip. Did I do this right?
Znom - Dual 2 ohm BL - 21.4 n/a Cutout diam - 16 3/4
RE - Dual 1.5 ohms Sd - 1210 cm2 Outer diam - 18 5/8
FS - 22.9 Hz Mms - 360 g Mounting Depth - 10 1/2
Vas - 280 L Spl - 91.8 dB 1W/1M Weight - 40 pounds
Qms - 4.962 Rms - 1500 W Voice Coil Diam - 3 inch aluminum
Qes - .334 Xmax - 25 mm one-way Voice Coil - Dual 2 ohm
Qts - .318 Price - $350 Cone - Paper/Kevlar fibers
Le - 1.2 mH
Home Audio ~ 8-10 Cubic Feet / 18-20 Hz tuning
Car Audio ~ 6 Cubic Feet / 28-32 Hz tuning
Originally Posted by Jack Gilvey /forum/post/0
Strange, the upper right reports an Fb of 20Hz, but the graph shows it to be around 32Hz. Did you update the graph after you entered your parameters?
Not sure what dip you mean.
Originally Posted by Richard Mayer /forum/post/0
The Fb (tuning frequency) isn't 20 Hz, it's more closer to 32 Hz. You should update the graph...
And there WILL be a dip at Fb in driver's response. That's because the port will make the most of the output there. You should look at the dark blue line, that's the combined response.
Originally Posted by PLincoln /forum/post/0
well here is what i came up with for a 260l enclosure with two 6" ports....
I wold think about shrinking the enclosure a bit to get rid of the hump at 26hz