From a friend who knows whereof he speaks: I've been in pro sound since I was 15 years old. I've learned a lot over the years, and one of my absolute greatest mentors was/is Dan Healy, the legendary soundman for the Grateful Dead. He was there since virtually the beginning of the modern PA system. That band and its crew were for years the top guinea pig testing ground for PA equipment. Many of the biggest names in sound grew out of that "laboratory". One thing I really took from that school was the kick drum and it's role in the music and the mix. Like them or not, the sound of the Grateful Dead is to this day, arguably the finest sounding live concert experience in history, just amazing, audiophile, not-too-loud, and outrageously danceable. One of the fundamental aspects was the lean and tight and hi-passed kick drum. What that does is let the bass guitar notes rule the bottom end, real notes with pitch and musicality. The kick drum would be clear and fast and would sit ABOVE the bass helping define the downbeat, but not dominating the entire system and fatiguing the heck out of the listeners. Also, that modern loud, muddy kick loads down the eardrums and makes everything get loud. Also, people don't dance well to giant kick drums. It makes people unable to feel the music and bass notes in their belly and they end up just standing there half paralyzed bobbing their heads. It's tiring, exhausting, and non musical. Concerts are just plain better when the kick drum is quieter and has its energy below 80Hz rolled off nicely. I've actually written and presented lectures on this very topic of low end in audio, the tragic abuse of kick drums in live concerts, and the physiological effects it has on the human body. And one of the worst things that can happen to a band is to have a big, subby kick drum on stage, loud in the monitors. That ruins band dynamics and ruins stage sound. It's the killer of music.