Avid Pro Audio Community

Avid Pro Audio Community

How to Join & Post  •  Community Terms of Use  •  Help Us Help You

Knowledge Base Search  •  Community Search  •  Learn & Support


Avid Home Page

Go Back   Avid Pro Audio Community > General Discussion & Off Topic > General Discussion

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-14-2009, 12:23 PM
kevinc333 kevinc333 is offline
Member
 
Join Date: Dec 2008
Location: Alabama
Posts: 39
Default Signal strength over distance

How far can a typical microphone/line signal be carried over a standard cable or snake? At what point do you need to boost the signal?
Reply With Quote
  #2  
Old 01-14-2009, 05:41 PM
tha]-[acksaw tha]-[acksaw is offline
Member
 
Join Date: Dec 2007
Location: Bay Area, California
Posts: 674
Default Re: Signal strength over distance

i don't have the answer (sorry about that), but this is a great question. i would love to hear some info about it.

and if anyone has any info, here is another question...

whats the best way to boost the signal when getting into this dangerout terratory.

thanks!
__________________
www.TheSoundCoop.com
www.youtube.com/TheSoundCoop
PCAudioLabs 2.5GHz Quad-Core Q8300 FSB:1333/1066MHz, NB:IntelG33, SB:Intel ICH9DH/WinXP Pro SP3 / SATA HD's = 160GB(7200/8), 320GB (7200/16) x 2,500GB (7200/32) / 4GB DDR2-800 / FW = TI ChipSet / Gear: Apogee Rosetta800, ADL600, Avalon2022 // M-Audio = Profire Lightbridge, Octane 8's, BX5's BX8's & SBX // ProTools MP 8.0.5 w/ MPTK 2 - Velvet Waves Sonnox IK NI FXpansion Massy -- DVerb2.0 Test = 230 verbs
Reply With Quote
  #3  
Old 01-14-2009, 06:00 PM
DigiTechSupt's Avatar
DigiTechSupt DigiTechSupt is offline
Avid
 
Join Date: Jan 2000
Location: Worldwide
Posts: 33,637
Default Re: Signal strength over distance

Mic signals can go a long ways - 100+ feet or more, because they're low impedance signals.

Line level signals, on the other hand, start to peter out around 25 feet, as they're high impedance. Converting to low impedance (with a direct box) allows you to run them for longer lengths. That's the best method, as continually boosting the signal just raises the noise floor of the signal, degrading sound quality.
__________________
Avid Audio Tech Support
Help us help you - read this before posting
Support FAQ
Reply With Quote
  #4  
Old 01-14-2009, 07:21 PM
Barnabas Barnabas is offline
Member
 
Join Date: Jan 1999
Location: Raleigh, NC, USA
Posts: 966
Default Re: Signal strength over distance

Quote:
Originally Posted by DigiTechSupt View Post
Mic signals can go a long ways - 100+ feet or more, because they're low impedance signals.

Line level signals, on the other hand, start to peter out around 25 feet, as they're high impedance. Converting to low impedance (with a direct box) allows you to run them for longer lengths. That's the best method, as continually boosting the signal just raises the noise floor of the signal, degrading sound quality.
Unless by "line signal" you mean a balanced line signal, like what goes between a mixer and an amplifier or between a preamp and a balanced line input on a recorder. Those signals can travel much farther then a mic signal without degradation of signal.

In a large-venue concert, you might have mic signals traveling down 300 feet of mic cable/snake cable to get to the mixer. The signal looses a little something going that distance, but it's OK for live sound, but might be noticed in a recording. Converting to digital on stage (close to the mic) can cut down on a lot of the long-distance loss.

I have run a dynamic mic through over 1,000 feet of cable for an outdoor event with no problems, but then that was for a sports announcer, not for critical music.

If your recorder is a long distance from the microphone, it's best to keep the mic cable short and allow the cable between the preamp and the recorder (assuming a balanced line) to be longer.

Some recording trucks will place their preamps on stage and then run balanced line-level signals out to the truck.
__________________
www.barnabas.com Barnabas MultiMedia
Reply With Quote
  #5  
Old 01-15-2009, 10:22 AM
DigiTechSupt's Avatar
DigiTechSupt DigiTechSupt is offline
Avid
 
Join Date: Jan 2000
Location: Worldwide
Posts: 33,637
Default Re: Signal strength over distance

Quote:
Unless by "line signal" you mean a balanced line signal, like what goes between a mixer and an amplifier or between a preamp and a balanced line input on a recorder. Those signals can travel much farther then a mic signal without degradation of signal.
I should have clarified that. Line level, unbalanced, high impedance signals is what I was referring to. Balanced, lower impedance (but not as low as a low-impedance microphone) signals can also be run long lengths without any noticeable signal degradation.

My numbers are also extremely conservative, fwiw.
__________________
Avid Audio Tech Support
Help us help you - read this before posting
Support FAQ
Reply With Quote
  #6  
Old 01-15-2009, 11:17 AM
kevinc333 kevinc333 is offline
Member
 
Join Date: Dec 2008
Location: Alabama
Posts: 39
Talking Re: Signal strength over distance

Thanks for the help!!
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strage Beat Detective Conform Strength Behavior sleiweke Pro Tools 10 0 02-06-2012 02:02 PM
OT - how do you distance yourself? Stig Eliassen General Discussion 19 10-27-2010 04:43 AM
Maintaining volume strength in fades? Ken P Tips & Tricks 3 10-13-2006 12:53 PM
Managing input signal strength during tracking liv dicknash 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 5 03-11-2004 09:53 AM
Using one signal to lower the volume of a second signal for distance learning? Bastiaan 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win) 7 04-23-2003 01:54 AM


All times are GMT -7. The time now is 09:58 PM.


Powered by: vBulletin, Copyright ©2000 - 2008, Jelsoft Enterprises Limited. Forum Hosted By: URLJet.com