I have a Softail Standard 2007 Harley, I installed pyle audio bluetooth speakers used the wire adapter that fits into my wire horniest on my Harley, I grounded my speakers and I get distortion when I turn my throttle, what could be the possible cause. The speakers sound great if I'm at idle position. I have taken the wire adapter out and used just the negative and positive wire and get the same response. I tried grounding the speakers to the chassis and directly to the ground on the battery and there is no change in sound.

 

That damned horniest connection

 

LMAO!! I'm not familiar with the Pyle bluetooth speakers. But since it only happens when you turn the throttle I'd take a look at the spark plug wires and make sure they are nice and tight. Not arcing etc. . . Not saying this is your issue but it's something to check out.

 

Audible lol