What is under $5k speaker with best bass slam?

count me down with the quality sub addition. hz. range can be tailored to whatever program you play and volume as well. it's practical in size, purpose and cost. otherwise you are getting into the hearing range of music that is extremly a personal thing. want SLAM? get a sub!

you may seriously want to consider Proac Studio 140

I do not claim to be an expert in these matters, but dude....I tried my best to replace my kef 107's, but at the end of the day I just couldn't do it. Those two 10inch woofers gives me that DEEP bass that I love. I looked at revel salons and b&w N801 and decided to stay with my kef's. At least until I can find those at the absolute right price. Try to get your hands on a pair...you won't regret it!!

Von Schweikert speakers

That's easy, get a pair of original Energy 22 Reference Connoisseurs....they easily go down to 25hz and more like 20 without breaking a sweat.