Stryke Audio AV12 sub prototypes - simulations

Scroll mouse over chart to see a comparison with vented box simulations

Sealed:

The 28L box is clearly too small - too much EQ is required to match even the 55L which is not much bigger. Any further increase in box size has very little gain in bass extension. Therefore, I conclude that the 55L is the best compromise for sealed.The only reason I can see to use a bigger box is the Q. An 85L box has a Q of 0.5.

Vented:

When room gain is allowed for, the EBS and larger vented boxes tuned to 20 Hz have an exaggerated deep bass hump. This effect is significant in the EBS, and perhaps not so severe in the 85L and 70L box. The best would seem to be the 70L or the 55L.

Assumptions & Notes:

These simulations were done with "Subwoofer Simulator" then the results were exported into excel for comparison. The room gain, which is shown in the black dashed line, was modelled for a 5 x 7 metre room with a 2.7m ceiling. As Subwoofer Simulator gives half-space results, I subtracted 6db to get the anechoic response. The results shown above include room gain.

The results also include a 4th order rumble filter @ 20 Hz and a 4th order Low Pass filter @ 60 Hz. No EQ is used with the sealed subs.

The vented subwoofers were all tuned to 20 Hz, except the 55L which was tuned to 25 Hz.

Can anyone do measurements?

I'd like to get some measurements, but I don't yet have measurement capabilities. If there is anyone in Melbourne, Australia, with this capability who would be interested in helping with this project, I'd love to hear from you.