Yes, the SP51 is VERY Bass-Heavy.
I did several test, so my SP51 can go down to 20 Hz and it worked. It goes that low when needed. The bass impact is now like a bowling ball hitting the floor with the Enhanced and Extreme Bass Ports, especially with the Comply T-400. Although the texture may need some work. Otherwise, bassheads can't ignore these IEMs.
Edited by Niyologist - 5/7/11 at 9:54am