RandyB
1 post
Jan 25, 2016
5:06 PM
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Hey guys I've been harmonica for a little over two years so I'm fairly new at this. I have a problem with my equipment. I'm using a legacy microphone and a cheap little marshal amp that I bought for my guitar I believe it's about 50W cost about $100. The problem is when I'm playing through the Mike I can barely hear it come out of the amp maybe I'll just have a bad amp or maybe I'm using the wrong type of amp or maybe I even need whatever pedal I hear players talking about either way I'd like some advice.
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jbone
2141 posts
Jan 25, 2016
5:16 PM
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Randy, your amp, is it a solid state or tube amp? I'm guessing it's solid state. Your mic- any idea if it's a high or low impedance? Tube amps generally want a high impedance mic while solid state are looking for a low impedance, like a Shure sm57 or sm58.
I'm not sure what you mean by a Legacy mic, is that the brand? I think first off I'd have the mic and amp checked out by a good tech to be sure they are both in good order.
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shakeylee
494 posts
Jan 25, 2016
8:29 PM
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does the amp work when you play guitar in it?
is it a condenser mic that requires pahantom power that it is not getting in a HiZ application?
is there another mic you can borrow to try through your amp?
if you live anywhere near philly,i can help you sort it out.
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www.shakeylee.com
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Barley Nectar
1087 posts
Jan 25, 2016
8:47 PM
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Guitar amps want a high impedance input no matter if they are tube or SS. Guitars are high impedance output instruments.
Randy, if your rig was working before and it is not working now, you have a problem in your gear. It may be the mic, the cord or the amp and possibly a combination of any or all these things. Use a process of elimination to find the problem component...BN
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DannyRanch
59 posts
Jan 26, 2016
9:38 AM
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Hi, taking advantage of the existing thread, instead of opening a new one, I have a question regarding impedance.
If I play with a sm57 which is a low impedance, and I want to play through the PA then there is no problem, as long as I'm using the xml cable correct?
But if I plug that to a tube amp or a SS amp, do I need anything in addition to the 1/4 cable? any converter or something?
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shakeylee
495 posts
Jan 26, 2016
9:46 AM
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to use a low Z mic into a guitar amp,you can use an impedance matching transformer to optimize the efficiency . you can get them for about $20 ,so it makes sense to have one in your gig bag,even if you don't use it.
http://www.ebay.com/itm/Hosa-MIT-435-NEW-Mic-Transformer-XLR-F-LO-Z-to-1-4-M-HIZ-/200920842428?hash=item2ec7d0c0bc:g:XB0AAMXQvTlRgJFe
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www.shakeylee.com
Last Edited by shakeylee on Jan 26, 2016 9:54 AM
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hvyj
2920 posts
Jan 26, 2016
6:57 PM
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If you are playing a low impedance mic into a guitar amp you MUST use an impedance matching transformer. It is NOT optional.
@RandyB: I bet if u use an IMT it will solve your problem.
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