Yeah, I didn't know about this either. Phil told me about it when I asked him about HY3 and BA4 and then I was immediately tempted once I heard there was a BA4F.
Yeah, I was sort of set on the HY3 after learning about how neutral the BA4 was but then once I heard about the BA4F I immediately jumped back on to the BA4. Clarity with a bit more low end = happy camper. Phil sure does listen to what his customers want.
Any price difference between the two?