This is a drop-in speaker system for the Scale Trains GTEL 8500 Big Blow Turbines.
The A-unit utilizes the UFIT-2318-RC1 speaker mounted to the shell's roof with the speaker hovering over the rear truck-tower. The stock speaker should be disconnected but can be left in place. The SSS speaker will yield much fuller and clearer sound with more volume to the hostling engine and horn/bell.
The B-unit speaker is the SXTH-BLOW-RC1 and is a half-round speaker that slips into the turbine exhaust casting. Again, the stock speaker should be disconnected but can be left in place. This speaker will fill-out and smooth-out the turbine sound, giving it the deeper "whooshing" sound the prototype had.
The speaker comes fully assembled and tested.
Dimensions: 21mm Diameter x 18mmH x 18mmL