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Dirty-South Blues Harp forum: wail on! >
Mic impedance into a
Mic impedance into a
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Kingley
265 posts
Jul 22, 2009
12:47 PM
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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!
Last Edited by on Jul 22, 2009 12:49 PM
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MrVerylongusername
433 posts
Jul 23, 2009
2:23 AM
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I think Greg is the best person to answer this, but I'll give it a shot since you need to know for tonight!
Hi-z into lo-z is not a good idea in theory. Lots of signal loss (i.e. tone and volume) I also suspect XLR-XLR just isn't going to work (the signal carrying pins being all wrong without some sort of adapter or custom lead)
I think the Di box idea is probably a goer if you have the right kind of Hi-Z XLR-1/4" cable.
Better to use a Hi-z line input if the desk has one using a High-z cable (xlr-1/4" pin 3 hot for a 545 I think). Most desks have dedicated instrument channels,
although a lot don't have gain controls on the line channels, so you might not be able to drive it to clipping (if you want dirty) without a preamp - also bear in mind, PA preamps don't really sound so great when they clip.
Since the RE10 is low-Z I'd go with that. I think they have very good feedback rejection, so I wouldn't worry unduly. How about rewiring your 545 for Lo-Z It is a very quick and easy job - just a screwdriver needed -instructions here (well instructions for low to hi, just do the reverse!) if you don't have them:
http://www.angelfire.com/music/harmonica/shure545.html
Last Edited by on Jul 23, 2009 5:32 AM
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Kingley
269 posts
Jul 23, 2009
2:50 AM
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Thanks MrV
Yes, I rewired one of my 545SD's to Low-Z last night. I'm gonna take that and the RE10 just in case.
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