If you have J&M speaker, Go with J&M amp you will be very happy. I have a 2009 Road Glide CVO and put all J&M but no amp, and sound was like a mono, Then i put the J&M amp and it was just great sound. The J&M amp has a rubber for vibration and you will be happy. Contact me if you have any questions and need pictures dooox@aol.com
I started with JM years ago before I got educated. If they sound great to you that's the important thing cause it's your sled. That being said, JM and audio upgrade don't belong in the same sentence. The rubber is for the bend over they gave you paying premium price for low end stuff.
Shoot me a note brother. We put together some sweet set ups in different price ranges. I'm finishing up a four speaker set up with an Arc Moto Amp that should sing. I'll post a vid once complete.