I'm looking into building a sub, and I don't have a table saw, router etc to make my own box (to a good standard). So I thought something like one of the flat-pack kits would be ideal.
I was looking at the 12" Dayton Ultimax kit on Parts Express. It comes with a 2 cft box, which when I model with the driver in WinISD comes out with a Qtc of 0.80. According to the seller, stuffing the box with 1 lb of fill will give a Qtc of 0.707.
I used WinISD to find that to get a Qtc of 0.707, the effective volume needed would be about 3.5 cft. Could stuffing really lower the Qtc this much? Or is the seller over-stating this? Is there some way of calculating the effect of stuffing on the effective volume and/or Qtc?
On a related note, I've seen comments around the forums of an advanced parameter, Qa, which can be input on WinISD to model the effect of stuffing the box. But I don't have any advanced box settings in WinISD. Was this feature removed?
I was looking at the 12" Dayton Ultimax kit on Parts Express. It comes with a 2 cft box, which when I model with the driver in WinISD comes out with a Qtc of 0.80. According to the seller, stuffing the box with 1 lb of fill will give a Qtc of 0.707.
I used WinISD to find that to get a Qtc of 0.707, the effective volume needed would be about 3.5 cft. Could stuffing really lower the Qtc this much? Or is the seller over-stating this? Is there some way of calculating the effect of stuffing on the effective volume and/or Qtc?
On a related note, I've seen comments around the forums of an advanced parameter, Qa, which can be input on WinISD to model the effect of stuffing the box. But I don't have any advanced box settings in WinISD. Was this feature removed?