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Joined:
July 2003
Posts: 181
Location: North Carolina | Hi,
I am interested in getting the Shure PG48 mic for talking between songs when I perform (I am an instrumentalist). It comes with either an XLR cord or a 1/4 inch. It would be easier for me to get the 1/4 inch since I am already using the 2 XLR inputs on my amp. Does anyone know if this creat an inpedance problem? If so, what would be the effect on the sound from the mic? Thanks.
Franklin |
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Joined:
January 2004
Posts: 648
Location: Florida | Get it with the XLR cord, and get one of the adapters that has an impedance matching transformer in it, so you can run it on a 1/4 inch jack. You'll have the best of everything at that point, since you could take any of your XLR equipement and run it high impedance when needed. Those adapters (by Shure, EV, others) are pretty cheap. |
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Joined:
July 2003
Posts: 181
Location: North Carolina | Yeah, I have one of the adaptors. I was hoping the 1/4 inch mic/cable would work since the adaptor is one more thing to keep up with/lose! I was wondering if anyone knew anything about these Shure mics with the 1/4 inch terminals. Are they naturally impedance mis-matched or would they work OK?
Franklin |
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Joined:
January 2004
Posts: 648
Location: Florida | The "adapter" is built into the mic, and you get hiZ out to the amp.
Tellin ya... go loZ out of the mic, and impedance match at the amp input. The XLR cable will lock to the impedance matching adapter, you won't lose it. Just do it dammit!!!!
Now back to my regular self. Thank you. |
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Joined:
July 2003
Posts: 181
Location: North Carolina | Awright, awright, you talked me into it! :)
Franklin |
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April 2003
Posts: 2503
Location: Fayetteville, NC | Good Going Franklin!! I was going to suggest the adapter..but someone beat me to it! Hope everything is going well for you and your O!!
One day all the Carolina OFC'ers are going to have to get together for a jam.
sounds like fun doesn't it?? :D |
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Joined:
November 2003
Posts: 100
Location: Warren, OH | Franklin - there is a good reason to use the lo-Z outputs wherever possible - noise immunity.
I'm a Electrical Engineer (by degree, I mostly do controls/software). The impedance (Z, or the AC equivalent of resistance R) of a circuit, determines how much that circuit "loads down" a signal source it sees. Low impedance circuits don't impede or resist the flow of electrical current much. High impedance circuits, on the other hand, impede or resist current flow a lot.
So lo-Z circuits require a signal source that can deliver a large amount of current. Noise sources do not meet this requirement. As a result, most of the signal power the lo-Z circuit sees is the sound of your voice - so you get a better signal to noise ratio - i.e., cleaner sound.
Why use the converter to go into your amp? For most of the run, the signal is lo-Z and less susceptible to noise. The hi-Z portion of the run is small, so you'll get less noise pickup than if the whole run were hi-Z. A long mike cord acts like an antenna, and the longer the cord, the more susceptible you are. Additionally, the hi-Z circuits have problems supplying enough signal when you go to longer distances.
Down the road, when you're playing out and plugging into that expensive PA or buy that really expensive amp, you can get rid of the impedance transformer.
I hope that's not too technical... If you haven't noticed, all the expensive Ovation guitars, as well as the Adamas models, all include a lo-Z output. That's why.
High impedance circuits do have their uses, however (voltage measurements are the first example that comes to mind), when you don't want to affect a circuit. The highest impedance you ever get is when you're disconnected.
- Bob |
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Joined:
July 2003
Posts: 181
Location: North Carolina | Thanks for the great explantion, Bob. I did decide to go with the XLR mic and use my converter at the amp.
Franklin
P.S. Steve, I wonder how many of the OFC'ers are Carolinians? |
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Joined:
April 2003
Posts: 2503
Location: Fayetteville, NC | Franklin,
Good Question. TR Boy is in SC and their may be at least 5 or 6 of us in NC. maybe we'll catch some responses here or start a new Thread looking for OFC'ers in the Carolina's. |
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April 2004
Posts: 265
Location: Warrenton, Virginia | Steve
what part of carolina? I'm in Northern Virginia. |
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Joined:
April 2003
Posts: 2503
Location: Fayetteville, NC | Sam,
I'm in Fayetteville,NC and Franklin I believe is in Winston-Salem, I've seen 2 or 3 posts from Charlotte, NC members and TRboy lives in SC. Not sure if there are any others out there. |
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Joined:
April 2004
Posts: 265
Location: Warrenton, Virginia | Steve
I'm in Warrenton, VA. My mother lives at Rocky Mount VA....not far from Winstom Salem....
Fayetteville....Fort Bragg area right?
I used to fly into Seymore Johnson several times when it was still open.
I'm open to a central Carolina area to get together |
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Q about mic impedance
