SQ Subs

Notice on the graph above the shallower roll-off of the Braha's low end.  Now increase the power on the Brahma to about 1200-1500 watts and see what happens.  Keep in mind that the linear excursion limits on the Brahma are up over 2" peak to peak. 

Also try graphing each sub in the same alignment instead of the same size enclosure. 

Is that the old Brahma, or new Brahma you are graphing?  One thing to be aware of is that WinISD is assuming that the parameters don't change with excursion.  In reality each subwoofer will be effected by BL compression, the Brahma quite a bit less so due to the XBL^2 motor.  Sure a sub might have a better 1 watt sensitivity, but that will quickly be reduced with excursion.  The Brahma will have the same efficiency throughout most of it's excursion due to the flat BL curve.  This has thrown people off in the past when they were expecting a lower efficency out of one of our speakers compared to another due to the lower rating.

Steven Kephart

Adire Audio

Ok, I had our sales manager model the old Brahma compared to the Perfect in LspCad which is much more accurate than WinISD.  It shows the Perfect running out of excursion at less than 400 watts input in that enclosure.  With that limited power to the perfect and 600 watts on the Brahma, the output level is pretty much the same in the upper frequencies, with more extention on the low end going to the Brahma.  However the Perfect is at it's peak, while the Brahma can still go further yet if you have the power available.  This shows that although we are less efficient, we do have better low end extention in the same size enclosure.

Steven Kephart

Adire Audio

Unfortunately I don't have a copy of LspCad on my work computer otherwise I could.  And yes, your conclusions look right. 

Steven Kephart

Adire Audio