Originally Posted by Bohemian
Or am I reading that no FAST connectors work with the BTAx250 series? So is there an install kit needed/required or is all included and I just have to splice into wires?
That is correct, the FAST Harness System is not compatible with the 250D line. You will need to purchase an amplifier installation kit to complete the install. You will want to identify a switched +12v source for the remote turn-on connection as well as the correct wires for creating a signal source. You can connect to the factory speakers and use the Tube's High Level Inputs or install an LOC and connect the Tube using the Low Level Inputs.
Look for a LOC such as the PAC SNI-45T (High Power 2-Channel Line Output Converter with Low Voltage Trigger Remote). With going this route you will no longer need to identify the factory switched +12v source, just connect the remote turn-on connection of the Tube to the remote wire of the LOC.