After hearing the ANV-50 and liking it, I'm interested in what swayed you in comparison speak. As you know, I'm amped out. I didn't get a chance to hear this one as they onel had the 50- and 21 for demo.The ANV-50 just didn't do it for me; I wanted to love it but couldn't. The IA-4 does everything and does so across a wide range of musical genres. 33w a side of pure Class A loveliness.