The 2150B is 1.5v and the impedence is 10K. Can't help on the others.
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I hope this triggers some responses (if not I will start a new thread)..
My top end amp ASL Hurricanes has a high sensitivity. Therefore it plays loader then my bass amp. The Hurricane is powering the midrange and tweeter section of my RS 1-B's. The bass amp (for now) is a Perreaux 2150. Because this has a lower sensitivity I have to raise the volume on the crossover for the output of the bass. Is there a better way to do this? In other words I would like to lower the sensitivity of the ASL's to compensate for the woofer amp.