I'm auditioning speakers and need a little help in understanding the relationship between accuracy, impedence, and sensntivity. 1st speaker (paradigm studio 100 ) is rated at 90 db into 8 ohms. 2nd (revel F-32 ) is rated at 86 db into 6.5 ohms. Does impedence influence sensitivity or does a lower impedence speaker just need more power to push. Does lower sensitivity mean less accuracy, or just less efficiency?