The chart indicates SM-5 for the IC-720, 730 and 740. The SM-5 is indicated as have a Hi Amp in the chart. The SM-8 is not indicated for those rigs. The SM-8 does have Low/High Level switch. Will the SM-8 sound well on my IC-730 and IC-740? Is there a mod for the mic that might help? de Dick - KA5KKT