Im planning to build a switch box to mount into the back of a 1x12 8ohm 65w solid state combo. The idea is to have a switchable configuration of extension cabinets with the following 4 options: 1. Internal speaker only 2. Internal speaker + dummy load + 2x12 extension cab 3. Internal speaker + 1x12 extension cab + 2x12 extension cab 4. Internal speaker disabled + 2x12 cab + 2x12 cab To enable the use of a 2x12 cab (option 2), I originally planned to use a couple of aluminium clad 100watt resistors (4R7 and 3R3 in series) to act as a resistive load in series with the 8ohm internal speaker. However now Im wondering whether it would be better to design a reactive load instead of a resistive load? What would be the difference to the sound overall? Any risk to the amp etc? Any advice appreciated. Thanks!!