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The differences in that will be subtle, in my opinion. I did the same setup and bought 2 8 ohm speakers. I have my cab wired up where I can choose both in series (16 ohm), both in parallel (4 ohm), or either speaker at 8 ohms. If you want options, you could try something like that. Otherwise, pick a setup and don't worry about it again. i think you would hear and feel more differences in tone with fluctuations to your line voltage.

-Dan

I think if you search online you should be able to find some series/parallel switching diagrams. But I took the easy way, I had Guitar Cabinets Direct build my cab and include this jack setup: https://www.amplifiedparts.com/products/jack-plate-plug-and-play-mono-stereo geometry dash

It was really simple to hook up speakers to it, I loaded the cab myself.

Good luck and let us know how it sounds!

-Dan

I'm planning on ordering the 18 watt sIII kit when it is back in stock. I'm planning on building a head and a 2x12 cabinet. I've read that in order to take full advantage of the output transformers, the speakers should be 16 ohms. Is there a noticeable difference in these amps if the speakers are wired as 16 ohm vs 8 ohm (series vs parallel wiring I believe it's called.) I'm trying to understand whether not there are advantages or disadvantages to either speaker wiring setup with this amp. papa's scooperia