Re: mic cables
- Subject: Re: mic cables
- From: "Howard Chandler" <chandler@xxxxxxxxx>
- Date: Fri, 19 Sep 2003 23:21:05 -0500
Oops, I forgot the link.
- ----- Original Message -----
From: "Howard Chandler" <chandler@xxxxxxxxx>
To: "Howard Herrnstadt" <herrnstadt@xxxxxxxxxx>; <harp-l@xxxxxxxxxx>
Sent: Friday, September 19, 2003 10:53 PM
Subject: Re: mic cables
> Without getting all scientifical, the bottom line is to use a balanced low
> impedance cable for long distances. These are just as suseptable to
> electrical charges (caused by the triboelectric effect) but because the
> signal travels in a differential pair, any noise common to both signal
> is canceled when the difference in voltage is amplified. That's why PA
> mics (57's 58s etc), which are often cabled long distances to front of
> mixing boards are lo-Z. If you're amplifying a Hi-Z mike (like a jt-30)
> than I agree with Barbeque Bob. His solution A., using two transformers
> will work, but who want's to be dragging a mic cable and transformers
> where it can be stepped on or catch on something. The wireless units seem
> to be getting very reasonable in price these days. If you like to go a
> wanderin', IMO this the way to go.
> Here's one for under 100 clams. I only just looked this up on the web.
> I've never used it, so this is not an endorsement.
> Good luck.
> Howard Chandler
> ----- Original Message -----
> From: "Joe Mahan" <joe.mahan@xxxxxxxxxxx>
> To: <harp-l@xxxxxxxxxx>
> Sent: Friday, September 19, 2003 9:01 AM
> Subject: re: mic cables
> > From: "Howard Herrnstadt"
> > >I wonder if cables can be tested to show which ones have less
> > >a cable has a lower guage wire (i.e. thicker) it might function more
> > >efficiently.
> > The resistance won't be much of an issue for typical cable lengths. The
> > more important factor is the tribolelectric characteristic of the wire.
> > Good quality microphone cable has carbon-like powdery material in
> > the shield and the insulator to reduce the tendency of the cable to act
> > like a piezo pickup and create electrical noise when the cable is moved.
> > You can do a crude comparison of the triboelectric effect in cables by
> > shorting one end, plug in the other end, and wiggling the cable.
> > Joe
> > --
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