Channels and Impedance

Sorry this is a pretty basic question. I'm looking for a four channel amp for my front and rear components. For an amp that is 4 channels and rated at 4 ohms, does that mean the amp needs to see a total impedance of 4 ohms? In other words, do I have to wire the front two (4 ohm) speakers in series and the rears similarly to get the 4 ohm total impedance? Thanks for your help.

An amp rated 50x4 @ 4ohms means each of the 4 channels will produce a max output of 50w assuming each channel is presented with a 4ohm load. No special wiring required.

Is that also true for 2 channels amps and rms?

If a 4 channel amp is stable at 4 ohms, then each channel needs to see a 4 ohm impedance.  The same applies for a 2 channel amp.  A 4 ohm stable 2 cannel amp needs to a 4 ohm impedance on each channel.  If  an amp is 2 ohm stable, then each channel can take a 2 ohm load.  This will usually allow the amp to produce more power too.That's my opinion. Take it, leave it, or correct me.

Thanks.