[Harp-L] Mic impedance into a PA

[Paul Routledge <kingley@xxxxxxx>]

If I plug a Hi-Z mic direct into the PA, it acts as an unbalanced Low- 
Z signal. Am I right?

If I am would it be better to use an XLR-XLR lead, or use the channels  
instrument socket and use an XLR-Jack lead?

If I used a DI box and ran the mic into that then into the PA it would  
be a balanced Low-Z signal. Am I right?

Would either way be of benefit tonally to the mic and it's frequency  
curve?

The reason I'm asking is because tomorrow I have a sit in on a local  
gig, but as it's only for a couple of tunes I would rather go direct  
into the PA than take my amp.

I plan on taking a Shure 545SD wired to Hi-Z, I also have an RE10  
(that obviously is Low-Z so is fine) that I may also take.

But I think as it's an unknown situation the 545SD may be a better  
choice with the on/off switch. Just in case the feedback monster  
raises it's ugly head.

Paul