Can 6 ohm speakers be used with an 8 ohm speaker selector?
the speaker selector is a dumb device, it does not care what the resistance of the speakers are or need to know. a speaker selector is a switch that allows you to switch between more than one pair of speakers, you do not give any details as to how many pairs you are trying to switch or the impedence level of the amp that you are planning on using to power the system. Assuming that it is a selector for two pairs of speakers, you will need two pairs of 6 ohm speakers and a reciever that can take a load at 6 ohms it is always good practice to use pairs of speakers with the same ohm rating for speaker selectors.
