Do you need "Phantom Power", or "Plug-in-power"? Phantom is 48V and is normally used on "big mics". Plug in power is something like 3-9V and is normally used for "small mics". So normally your 943s would use plug in power, which the R-09 does provide, unless you specifically bought them with phantom power adapters. If that is the case you need a phantom power supply, such as the Denecke PS-2.