Tom, Are you trying to rattle Howard's chain again? Yeah, they are modified, but "heavily"? That, to me, seems to say they sound like a different speaker. I don't think the change from push pull makes a noticeable difference. He's got a upper end frequency rolloff which is the same that many would do with an EQ or with the slope switch in a different Allison model.?The biggest change seems to be the change in focus mode. It seems like he's going for more of the A3 sound without the corner placement. I'm sure they still sound like Allisons, and I bet they still sound essentially like IC-20s. -Phil