2V vs 4V

[Goblin]

OK, so let's keep this simple. All factors the same and we are not talking high end here; is there a noticeable difference in 2V vs 4V output to a subwoofer?

Here again, I understand gain, etc. I'm just strictly talking 2 to 4, noticeable difference, and what is it in relation to sound.

For example: low end unit will not notice a difference vs a high end unit that would notice considerable bass with a cleaner sound? Thanks!

[Goblin]

I think I just found my answer. I hope this helps someone else.

"NOTE:A piece of equipment that has a higher maximum output voltage is not necessarily going to sound better than one which is only capable of 2 volts output. The higher output will allow you to reduce the gains on your amp (or any down line signal processor) which will lower the noise floor of your system. If you are not having trouble with noise (alternator, hiss...), you may not benefit from the extra output voltage. You also need to realize that the voltage may be more than your amplifiers can handle. The extra voltage will not damage the amplifier but if the lowest sensitivity (gain setting) on your amp is 2 volts, and you drive it with anything more than 2 volts, it will cause your amp to clip*. "

*This assumes that the gain setting is the voltage that will drive the amp to max power. Some amps are underrated and may have slightly more headroom and therefore will clip at a little higher power.