I think it's important to keep in mind that you're Still having to work within the confines (and they certainly Are just That) of the onboard amp and speaker.
That being said, + Pi on the Volume+.
I had it on my Motion and do now on the Spirit. It's amped difference isn't monumental (see above) but it's enough to make the difference. And, the price is right. (Freebers.) I used it for a bit just a few minutes ago actually. The sound is better on the Spirit than the Motion but there are times when it's just not quite loud enough. Volume+ does help then.
The little equalizer thinggummer doesn't suck either.
Bruce in Ocala, FL