Awesome. Maybe it's my mic. No matter where the gain is set. When I key up I hear a scratching sound in my external speaker. Hopefully the RK56 does well. Are you not liking the S45-HP? It took me awhile to get it how I want it. With my mic gain at 12 o'clock, rf power at 12 o'clock and me being a trucker....... Echo volume at 12 o'clock and echo delay at 1 to 1.5 on the dial that radio rocks. I have no problem talking 15-20 miles on 27.185 am with lots of traffic on the channel in the Dallas area. To another driver with a big connex.