Fred, from another site....
When adding two speakers in series it will increase the ohms.
When adding two speakers in parallel it decreases the ohms.
In series, when increasing the ohms, your amp will not put out the power it is rated at. 100w at 8 ohms may only be 60w at 16 ohms.
Parallel. If you go below the ohms your amp is rated to run safe at, it will burn out your amp.
I thought most folks wired in parallel, that's how I did my two center channels, I believe wired in series the speakers can clip easier due to the amp not supplying the sufficient power. I believe we're talking about really putting the power to the speakers though, I don't know how high of dB's you like to listen.
