Do all channels output the same ohms?

Sure, power output can be different.  It is determined by the impedance on THAT channel.

So if the amp is 70x4 at 4 and 100x4 at 2 + 300x1 at 4 or 500x1 at 2

Ch 1/2 would be 70w per speaker

Ch 3/4 would be 100x2 or 50w per speaker.

Sub would be 500.

Assuming all speakers are 4 ohms and the sub's wired for 2.

Danny Marz said:

So there’s no way to wire a single voice coil 4 ohm sub down to 2 ohms? My sub is just a single voice coil 4 ohm kicker sub

Click to expand...

I've had a few 5 ch amps in the past and currently on my 3rd one right now. What determines running a lower ohm load to your amp that will change impedances and more power is how you wire your sub and/or speakers for a final impedance. For instance: The sub ch on my amp is 250 @ 4 ohms, 450 @ 2 ohm and 600 @ 1 ohm. All these ratings are for 12.5 so it's underrated. My sub is dual 2 ohm. I have it wired to a final impedance of 1 ohm....wired to the amp and will make the most power from it that way. Pushing around 800-850 watts @ 1 ohm.

So to answer your question, your stuck on running that sub on 4 ohm....unless it was dvc then you would have more wiring options. I'd buy a dvc sub if I was you and sell that one.

Danny Marz said:

So there’s no way to wire a single voice coil 4 ohm sub down to 2 ohms? My sub is just a single voice coil 4 ohm kicker sub

Click to expand...

negative

Might not be much of a factor though.  The 300/500 example above would only improve output by a couple dB assuming the sub's not already near its limit.  Could be less than that.