I used to own one of these cabinets and it sounded great.
The switch switched the dc impedance between 4 and 8 ohms, as I recall, but above a very low frequency, which was sub-audible, the cabinet had 4 ohm impedance regardless of switch position. The company made some excellent cabinets, but the switch fiasco hurt the brand, imo.
Also, the two 12” drivers in the original version were identical, but they were housed in internal enclosures that were tuned differently. Each driver had its own enclosure within the main cabinet. Later they offered a version where one driver was standard and one was neo. They saved a bit of weight but my recollection is that the consensus was the original sounded better.