[Harp-L] What is the best position to stand relative to an amp to avoid feedback?

[dennis moriarty <dmoriarty@xxxxxxxxxx>]

 I'm embarrassed to get so basic but I'm rethinking my amp-mike  
relationship. Do devices such as a Maxon AD 999 analog delay or a  
Guyatone MD2 digital delay to a hot mike increase feedback potential.  
I'm playing through a 2 10'' Kinder Soulful amp and a Thunderharp  
mike with a very big and bassy element.  dennis (nyc)