I won't call them underground but competition grade subwoofers, these subwoofers can take a lot more wattage than your regular name brand subs and will sound a lot cleaner. I hope you choose widely young grasshopperyeah, underground probably isnt the best word to describe the smaller companies. they are just as good if not better, underground makes em sound shady lol
look at the PSI
what ever you get with that power, i will get at least a 3 inch voice coil, you wont see these voice coils on lower rms subwoofers.