Re: A2 vs A5
Think AC/DC for Alnico 5. Think Van Halen's "Mean Street" or "Dance The Night Away" for A2. As others have pointed out, A5 has more clarity and tightness, and usually more lows and highs. A2 has more midrange, softer lows and highs, and a looser overall sound. I like A5 in the bridge and A2 or A3 in the neck.
Ryan