I added boom mats to the 6x9's which holds them in place and works as a speaker box for resonance.
With the bags open, the system sounds incredible.
Very clear at high volume - 15 is crazy loud and clear.
20-22 is deafening, yet still clean and clear.
Both the Polk and Infinity are designed for 125 -150 watts RMS each, so they love the amp.
And the 6x9 add a bit more bass and low frequency to balance the system.
They are also a 3 way with mid and high frequency tweeters, +/- 3 db.
I wired them so they can be un plugged and easily removed if we need the room.
To your question Pilot; no vents - ports cut yet.
I'm a little undecided about cutting into the bags.
I know that's what needs to happen to really hear the 6x9's going down the road.
I'm sleeping on port location, size, covers or if I mount them face against the wheel, face down on the floor.
A custom lid like Harley would be the ticket but I don't have that fab time right now.
For now, its fun to park at the local.. open up the bags and let em blast.
Jim