Kyleneuron,It uses an OEM upgraded version of the Eminence LAB12, as mentioned earlier in the thread.
Marcel,The reason (correct me if am wrong) the driver is not at the mouth of the horn is to appear to make the suspension of the driver stiffer as it is totally inside the horn. This is important for the passband between the 2 horn loading peaks, because the LAB12 on its own has a very loosy suspensions (FS around 22hz).
The TH-112 has 3 horn impedance peaks below 100 Hz, the driver position is optimized for usable response well past 100Hz while minimizing the "saddle" dip around 60 Hz.
What is the "upgrade" to the OEM version compared to a standard LAB12?
Interesting, the driver depicted in the 2012 TH-112 wire frame looks nothing like a LAB12, while the DSL CS30 does, but lists an "8 ohm" nominal impedance, 6.5 ohm minimum. The TH-112 claims an "8 ohm" nominal impedance and a minimum impedance of 5.3 ohms.
Do your dealer/distributor spares list the same “122345”driver as the replacement for the DSL CS30 or any other cabinets?
Here are the parameters of the beefed up version of the danley lab12
Data-Bass: Subwoofer Measurements
That could explain the relative low -3db response of the TH112. The place of the driver is within the horn to compensate the "saddle" between the horn 2 highest hornloaded points, around 60hz.
The horn stub in front of the driver is to bring the total response extending to the -3db point (horn loading to around 27hz according the impedance sheet).
It gets frankly disgusting in there if the engineer lets the kick drum run wild. Plenty of very deep, powerful low end too. We had them outside for a bit and I was equally impressed. It's interesting that it's the only non-DTS box in the line to use that loading method.
The CS30 isn't a tapped horn, by the way, which might help explain the different impedance curves.
Marcel,The CS30 uses the same beefed up version of the LAB12. If you have some modeling programm, try to modelate an (big) underdamped enclosure. The should give you an big peak peak at the low frequency cutt off. When have reached this, placing an inductor with the just right value (not the one that you are used to have with a normal low pass) in parrellel is going to uplift the upper low frequency response. Its like an electronic EQ, but is in fact a self generating voltage over the coil.