Hey @BanjoBen or anyone else who can help, what is the best way to fret an Ab chord on guitar? Currently I’m only playing a 3-string version of the chord - first fret on the B, G, and D strings. It doesn’t sound very full to me, but is that the best way to do it? I’ve also experimented with doing a closed position/barred G chord across all 6 strings, just one fret higher than G. But that’s kinda awkward to get to fast, when I’ve been fretting chords down in open position. Reason I need to know is because there’s a certain song our band plays where we go really quick from G to Ab to back to G (on 8th note beats). I have to switch the chords pretty fast, so I’m looking for the easiest version of an Ab chord that’s easy to get to fast, and sounds nice and full. Curious on what Banjo Ben would recommend! Would you jump up to the barre chords for that section or just use my 3-string version down on the first fret?
Guitar chord question!
You can do the last 3 string notes from the Ab barre chord and leave out the rest of the strings.
If all else fails, just chop on muted strings and hopefully no one will notice. 
It depends on what kind of song, because I’d be very tempted to play a closed swingy chord but it may not sound good.
None of the rest of the chords are swingy - all really open. That’s why I wasn’t sure about throwing in one barre.
The typical E shape barre chord is not swingy sounding to me.
Ok great, that’s basically what I was wondering - is that your go-to Ab chord, or would you ever do that 3-string method I mentioned?
I would more likely do a power chord on bottom 3 strings: 4-6-6 frets
That’s the perfect answer, I tried it out and it’s so much better than my “fret 1” method! Much fuller but not too hard to get to. Thanks @BanjoBen! 
Oh trust me, I’ve had to do it several times.
I find doing an F form on the 4th fret works well if you don’t need it to sound too “bassy”. Plus playing it that way is good practice for the full Barre chord.
It’s funny cause my wife asked about the exact same chord just 3 hours ago. There is an Ab chord in “What A Wonderful World” when played in the key of C major.