danimal

Got a boat with a tower I am hoping to hook up two pairs of HS-2t's. I was planning on running them in parallel to get them down to 4 ohms and using a yet to be determined amplifier at ~75watts a channel. My question is... on the back of the speaker they have an adjustment for impedance depending on the voltage input. The voltage range was like 22 -75 volts or something like that. I am now wondering if I can even use these for a mobile application, and if so how do I set the impedance? Thanks in advance Dan