Go Back   DV Info Net > The Tools of DV and HD Production > All Things Audio

All Things Audio
Everything Audio, from acquisition to postproduction.


Reply
 
Thread Tools Search this Thread
Old March 1st, 2013, 10:20 AM   #1
Inner Circle
 
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,404
Bulk lavalier mic cable

Hello fellow techies,

I'd like to replace lavalier mic cables (let's not get into soldering and other issues on the mic end for now).

I am considering Mogami bulk wire W2697, W3031 or W2901 , see MOGAMI® - Miniature Balanced / Lavalier Microphone Cables - anyone care to translate for me the tech specs on that page? Those noise numbers look confusing - how in the world can one model have 200 times as much noise as the other when the only difference is the braiding (OK, wire size too). What's better, the big number or the small?

Any opinion on differences between served vs. braided vs double served models? Does anyone have a recommendation for another, better cable?

What's the longest I can make a lav cable before it will start picking up noise?

Thank you,
__________________
Ervin Farkas, CDVS
Certified Legal Videographer
Ervin Farkas is online now   Reply With Quote
Old March 1st, 2013, 11:23 AM   #2
Major Player
 
Join Date: Aug 2007
Location: Portland, Oregon
Posts: 804
Re: Bulk lavalier mic cable

I see 4x difference between W2697 (spiral, 50mV) vs. W3031 (braided, 200mV).
The description says that shield construction is the only difference, otherwise identical.
Those numbers look reasonable to me.

Is their electrostatic noise test methodology published? Perhaps reading that would be enlightening.

The environmental factors are far more influential than the length of the cable. You can probably go 100 feet out in the desert, and maybe not 6 inches next to a GSM cell phone. The shielding properties of the cable are only a part of the total interference immunity picture (and not a particularly large part).

I thought the description was particularly helpful. Discussing the tradeoffs between shielding ability, flexibility, mechanical strength, terminability, etc.
Richard Crowley is offline   Reply With Quote
Old March 1st, 2013, 12:50 PM   #3
Inner Circle
 
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,404
Re: Bulk lavalier mic cable

Thanks Richard,

Electrostatic noise is indeed 50mV for the W2697 and 200mV for W3031, but it is 1mv for W2901.

1 to 200 is 200 times higher - that's what I am referring to.
__________________
Ervin Farkas, CDVS
Certified Legal Videographer
Ervin Farkas is online now   Reply With Quote
Old March 1st, 2013, 02:24 PM   #4
Major Player
 
Join Date: Aug 2007
Location: Portland, Oregon
Posts: 804
Re: Bulk lavalier mic cable

Yes the difference between W3031 (200mV) and W2901 (1mV) seems strange to me. That is why I suggested that maybe their testing methodology could explain the unusual difference. I do NOT believe that the W3031 is 200x (or even 4x) "more noisy". I think those are laboratory experiments that don't necessarily reflect Real-World performance. Perhaps their test methodology could be improved to be more representative of actual use.

I have retrofitted mics with long pieces of this kind of cable and I didn't see any particular difference vs. using "conventional" mic cable. Yes, the higher capacitance could cause some greater high-frequency rolloff, but I don't think that will be significant for speech program material.

OTOH, I WOULD expect that longer sections of unbalanced, medium impedance runs will, by definition, be more susceptible to things like cellphone RFI, etc. I am assuming you are talking about the wiring from a small lav mic head to the power supply or connector which is unbalanced in most brands and models.
Richard Crowley is offline   Reply With Quote
Old March 1st, 2013, 03:25 PM   #5
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,109
Re: Bulk lavalier mic cable

whatever is the methodolgy they use, one cable is can accept 200mv when the other can only stand for 1mV. Then you can choose what you need, knowing the 1mV cable is so because they tried to improve mechanical strength versus electrical performance.
Giroud Francois is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Omega Broadcast
(512) 251-7778
Austin, TX

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > All Things Audio

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 




Google
 

All times are GMT -6. The time now is 08:48 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2014 The Digital Video Information Network