Question I have a RH750 / RH450 and two RS cabinets (8 Ohm each). Can I use the cabinet from the BG250-208 as third cabinet for this setup Answer Yes that is possible as the 208 cab is also 8 Ohm and the RH750 can use a combination of three TC Electronic 8 Ohm cabs. The 2 connectors on the BG250-208 are wired in parallel, so you can use the exta connector, but you should disconnect the other cable  from the BG250 amp Speakon connector.