I can :
- The Dual LF drivers produce deep accurate bass, and when combined with Shure's patented acoustic filter, these drivers are able to roll off at about 90Hz.
- The MF driver is tailored to blend well with the LF and HF drivers, providing a smooth, clean presence while avoiding intermodulation distortion in the mid frequencies..
- Nozzle Insert: Once the HF and MF driver outputs combine, they are routed to the ear through the nozzle insert, which contains acoustic filtering to shape the high-mid frequencies.
See this is what's amazing about them, to me. Anyone can just keep jamming drivers in there, but unless a lot of TLC is put into the enclosure it's not that useful.