my amp is engl special edition My first mic is sm57 and very ok. I need another mic to blend with 57 I just tried heil PR30，but it seems over bright for me and got harsh at 6khz I saw Jeff loomis and alexi laiho use e906 mic in EMGTV. I suppose e906 might be darker than sm57. Is it a standard for engl amps? anyone tried md421 on engl amps?