Try an oscilloscope and report back. Not kidding.
I have no experience with this. Sounds silly to me, but I've been humbled a number of times here. Can you post some research materials for this?
You are only correct in a way that I do not believe you intend. Your amp may come with a chart of Voltage output recommendations based on speaker type and wiring. A 4Ohm setup will need a different output than a 2Ohm setup.
No pretension intended, but I do recommend that you read Basic Car Audio Electronics (well, minus the home theater stuff) a few times.