Assistance Audio Coaxial The Assistance Audio Coaxial is an OEM speaker that incorporates CIARE's neodymium 12" and a BMS 4552. The 12" is similar to the CX12.1 NDCX, with ten small neodymium magnets instead of one large one, and the pole piece has been machined to accomodate the BMS 4552. This speaker has a higher BL factor than the 12.1NDCX and also a bit more LF. Cost is $280. Passive Crossover A custom passive crossover designed by Curtis List ("Too Tall" to any LABsters) is available either preassembled or by schematic. You can see it pictured at right (partially visable) in a plexiglass box we use for trade shows and demos. Original Specifications