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Post subject: microphones
Posted: Tue May 27, 2014 7:16 am
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Joined: Tue Oct 23, 2012 7:27 am
Posts: 34
I have two passport systems a P250 & a PD250 .All microphones are Fender P51 mics. one has male/female XLR plugs . The other two mics have female XLR to mic and 1/4 "plug to amplifier.
The mic with the male/female XLR ends works great . The other to with the 1/4 plug are terrible . absolutely no volume !
The one with XLR ends I turn up maybe 1/4 to 1/2 at most. The two with the 1/4 " I can turn mic volume to MAX and turn my master controls up to 3/4 to get volume close to the other with the XLR ends.
I ordered one new cable with XLR ends.

Does anyone know how to wire up a male plug end if I wanted to replace the 1/4"????
Thanks


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Post subject: Re: microphones
Posted: Tue May 27, 2014 10:43 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14045
Location: Province de Québec, Canada
I never work on XLR jack , I know there balanced and unbalanced mic line
With Google ;

http://www.scotaudio.com/wiring.htm


http://www.mediacollege.com/audio/conne ... tereo.html


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Post subject: Re: microphones
Posted: Wed May 28, 2014 9:36 am
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Aspiring Musician
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Joined: Wed Feb 16, 2011 7:24 am
Posts: 434
My guess is that the three mics are identical, but one of them is using an XLR cable and the other two are using XLR-to-1/4"TS (Tip, Sleeve) adapter cables.

The problem you are having is that you are plugging in the one mic to an XLR input channel (which works fine because it expects a mic level signal), and you are plugging the other two into 1/4" input ports. They don't work so well because the 1/4" input channel assumes that it should be line level.

Microphones generate signals at "mic level". Sound systems operate at "line level". So, the XLR inputs are connected to a "mic preamp" which brings the mic level signal up to line level. That's a 20db or so boost.

The 1/4" inputs bypass the preamps, so those mics are not getting the boost.

Your cheapest and best option is to throw away those two cables and buy two new XLR cables. Then everything will work fine. If you feel some kind of emotional attachment to the 1/4" option, then you need to buy a separate "mic preamp" to plug the mics into, and then plug the line level output from the preamp into the mixer's 1/4" inputs. I don't recommend the second option.

Just get two new XLR cables and be happy.


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Post subject: Re: microphones
Posted: Wed May 28, 2014 9:46 am
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Joined: Tue Oct 23, 2012 7:27 am
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Evidently the previous owner used a pre-amp. I have already ordered new cables with XLR male/female ends. It's not worth the trouble to swap the end on the old cables . thanks for the replies !


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