If you are looking for wall shaking, picture bouncing, chest banging bass, i would have to honestly say none.
I have listened to, and owned a lot of Klipsch. I had 4 cornwalls here at 1 time, it was rocking, my freind said they have no bass. I thought he was crazy.
Take a look into the specs of the speakers on the site. I do believe the Forte go down to 32Hz, i think that may be the lowest rating other than a sub.
Most of the tower speakers also go down pretty low. In the heritage the Klipschorn goes down to the lowest point, other than the cornwalls.
The new Palladium P-39 is 28 Hz, now that is impressive.
But here is my honest opinion
Klipsch are not built for bass, Klipsch are built to sound, and be perfect. If you want the crazy bass i would recommend a SUB. The bigger the Klipsch, the bigger the sub, maybe even 2.
The only time i had the crazy Bass, was when I had 4 Klipschorns cranked in this small room. I actually felt the floor in my modular home lift.
The sound pressure was unbelievable.
I currently have cornwalls, they have plenty of bass, they sound perfect. If i want to have the crazy Bass i will jam out in the truck, where I have a 12inch fosgate, on a 1300 watt amp, bridged.
Klipsch is not just Bass, it is the superior quality, of craftsmanship, and sound.
Just my results over the years.
Regards Jim