The Ohm resistance describes the amount of electrical resistance that an amplifier reads, that is, the amount of current that can "pass" through the speaker.

The sensitivity of a speaker describes how effectively power (watt) is converted into sound pressure level (dB). Therefore, the higher the value, the louder the speakers will play with a given power.

2

This is a 2-way speaker where frequencies are shared between the tweeter and woofer. That is, the sound frequencies are reproduced by two speakers, a tweeter for the highs and a woofer for the lows.