HI Shane, Right. The problem would be in compression: most music has a 20 db dynamic range (and it could be just a couple of instruments & a singer but still have large dynamics). If you listen at 85 db (moderate-low level) you would still need to go to at least 105 db to not have compression by your system. hence the amp works great with K horns, but I would not recommend it for anyting less than 100 db. I must say it does make my K horns sound like single drivers...in that it emphasizes the midrange really well. Let me know when you are ready to start with the 4 " driver project. -akhilesh