How does the IMA differ from an external adaptor?
The IMA can be quickly reconfigured for any of the combinations of connector pin- out and external biasing resistance illustrated at right, while an external adaptor is typically custom fabricated for just one. Multiple external adaptors would be a better choice if you intend to use your K2 interchangeably with several mics having different pin- outs or biasing requirements. Further, an external adaptor would be required for a microphone having a different style connector than the K2, such as an RJ45, RJ25, or RJ11 jack. An external adaptor would also be necessary for a microphone with different MIC3 (DOWN) or MIC7 (GROUND) wiring – as is the case with Alinco’s newer mics – since these signals are hardwired on the IMA’s Mic Extender board. Something else to consider is that frequently reconfiguring the IMA jumpers will eventually wear off the gold plating from both the jumpers and the jumper blo