Quote:
SteveCallas wrote:
 I design LLTs with no port resurgence to better match with room gain, but in this case, the tuning is so low that I felt a 1.5db resurgence would actually be good to help counter some of the effects of electronics rolloff. I can't wait to see how it turns out. |
Also notice that the peak port velocity at tuning will be around 48 m/s (input power=2800W). According to Collo's research, core limit for 6" port at low frequencies is around 26 m/s, so there will be quite a lot of port compression. Adjust Qp value to 5 in order to get the peak port speed to 26 m/s. That will show the real max output around tuning frequency.
You should also add a some sort of HP filter, unless you want to exceed the Xmax below ~11 Hz. I know that's not the Xmech but that's where you limited the IB sub.
This is more close to real world difference when Xmax is not exceeded at any frequency.
SLLT: 3500W, Qp=10 (filtering also decreases output, so Qp=5 not needed), BW 1st order HP @ 10 Hz (electronics roll-off), BW 2nd order HP @ 9 Hz (to prevent bottoming below tuning).
IB: 2300W, BW 1st order HP @ 10 Hz (electronics roll-off).
Also notice the difference in group delay, around tuning the SLLT will have around 90 ms more group delay. Whether it's audible can be dabated. Just to inform that the performance gain doesn't come without any expenses.
If you want to squeeze more performance out of the IB, just add a 1st order HP @ 10 Hz and up the power to 3500W (equal with SLLT).
Just to keep things fair...
