Simple question I know, but I've been wondering this for a while. Is it harder for a receiver to drive 6 ohm or 8 ohm speakers? It's been my assumption that the higher the impedence, the easier it is to drive, but I may very well be wrong. I'm wondering b/c I'm about to replace my 6 ohm surround speakers with 8 ohm JBL E10 speakers, and was thinking if they are easier to drive, my receiver wouldn't be as taxed. BTW: I'm using a Denon AVR-1705 receiver (75 watts/channel). Thanks!