Bandpass sub trunk

fergatron1 wrote: What do you think? One thing I don't understand is why Mogale's plot of the 184 sub reaches near to 105db. When I modelled the 184 it was very similar the 18sb40, peaking about 97db..

Remember to include filtering in your plots. The minimum filter is 4th order L-R at 200hz. And sub cut filter is 2nd order B-R at 15hz in your amp. The BR portion should look exactly the same as in my plot. Also, did you check port length in your sim? I suspect that with such a large rear chamber and low tuning the port will actually not fit inside the cabinet if you are to avoid too high air velocities. EDIT: Checked. It's fine although you have to go up to 2x 120mm ports for both front and back. Phase/Group Delay plots don't look pretty though.

My goal was something that was flat to 50hz, small enough that you could fit the Boominator-style top in the same trunk (to replace your existing BR) and went high enough to be crossed with the tops directly. I think I achieved that.

2 identical BP cabs will naturally be able to play much higher volume (+6dB) than a single BP + BR.

The Mogale plot reaches about 104dB. I suspect one of two things have been done. Either it's a stereo set, meaning 2 cabs with separate amps to each, or the measurement is done at 25cm instead of 1m because it's naturally not posible to suddenly get a 6dB lift over the speakers sensitivity. At least not if the software used is accurate.  

8.4% no. was the clincher.