i just installed a Carson SC-550 in my truck. On the slide switch I have 1 powering an external feniex flashed powering my rear warning light and on 2 I have it powering a Whalen flasher powering my fronts. When I have the siren switch turned to horn/standby and I have the switch on 1 or 2 I hear a clicking coming from the speaker. The clicking follows the flash patterns. It's a quite click you can only hear it standing in front of the speaker. I have tried switching the wires of the speaker around I tried another speaker and it does the same thing. With the siren on you can't hear any clicking. Any ideas on what I can do to stop the clicking or is this normal?