A properly placed IB may or may not need more EQ than an LLT. An LLT has extra output in the low end, but has group delay. Saying the effect below 20Hz is minimal doesn't mean much to me since the sub is crossed over at 80Hz. Most people who've heard IBs seem to think the sound is very clean and that things just sound real. Most who've heard LLTs seem to think the sound is more powerful. The issue with IBs is you need more driver displacement to reach equal SPL when compared to LLTs, but you need less power. This means IBs tend to be more expensive (potentially a lot more expensive). The biggest practical concerns with IBs are where to put them (difficult to test) and actually mounting the drivers in your wall/floor/ceiling. With LLT's, the biggest practical concern is locating the beastly enclosures in your room. Like most things in life, both options are good when done right, it just depends what type of sound you personally favor and what works for your room (or what your SO will allow
).