This is good information. I used the V-twin audio grilles instead of Boom. They do not appear to be touching when I look through with a flashlight, but now I'm going to double check.

 

The problem I had was with the Kappa's installed on the outside of the pods, just like the stock speakers. The damage was done by the grills and the fairing opening. Where do you have the Kappa's installed, inside or outside the pods?

 

Mine are also on the outside. I went and looked again today. I can't tell if they are touching or not. They are definitely not touching the front of the grille, but I can't see the edges to know if they are touching the sides.

 

In my case the speaker surround was hitting the fairing opening and grill, not the tweeter. If you have the Kappa's installed, they will hit. The openings where not sized for standard 6.5 speakers. You can see the difference in the pics below.

You can't tell if they are hitting by looking at them after there installed. The only way to tell would be to install the speakers and pods with no grills. You will also have to take into account that the surround will be moving outward when you crank them up.

 

Here are mine that were damaged. The tear seemed to always start at the point where the screw holds the grill.




The problem is the mounting ring is too thick on the Kappas, I think it was close to .375" The Hertz speaker mounting ring was only .125"..

 

I wouldn't want to be the first to test this out.

 

Cam said, there should be no problems with the hertz and the pods. What you posted really makes sense.

 

Here are the comparisons.

Kappa surround is just under 5 5/8"

Mille Pro surround is just over 5 5/8"

Stock surround is 4 3/4" - 5 1/8" if you want to count the where it's glued to the basket.

I can see what you are saying about the Kappa's having a thicker basket and moving the speaker closer to the fairing opening. The only way to tell for sure if the surround will clear the fairing opening is to install the speaker on the pod and install the pod. Then look into the opening and check the clearance and allow for the surround to move outward.