I was running 10" tops over a pair of 15" DIY Neo subs, crossed over at 100 Hz. The bass is never going to be real deep, but I don't want it to sound lean either. Moving the crossover higher to 120 Hz helped, but it started to sound boomy. Due to my age and my vehicle, going up to 18" subs is N/G, so instead I increased the tops to 12" (Eminence Deltalite II's with Neo magnet). Everything is still light, it all fits in the car, still crossed over at 100Hz, but definitely more "weight" to the bass without "boom". I was afraid the 12's would make the mid-range noticeably more directional, but so far so good.