I have a sr655hp and was wondering how do I shut the echo off? Shawn November 14, 2016 22:00 Updated Find the VOL/DEL Knob, turn the VOL (rectangular shape) to the left until it clicks. The echo is now off. Related articles SR-655HPC Setup Guide I can transmit out, but I can't hear anyone Do i need to hook it up to the laptop to change it so it shows volts? Is there a way to make sure SWR meter is calibrated does not match up with my inline meter Difference between the SR-655HPC & SR-955HPC? Comments 0 comments Article is closed for comments.