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 > Legacy Products > 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac)

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-12-2004, 09:43 PM
oreo1 oreo1 is offline
Member
 
Join Date: Apr 2001
Posts: 183
Default balanced to unbalanced

The Digi002 rack takes balanced, 1/4 inch, TRS monitor cables. Its output is +4 dB. My samson amp takes 1/4 unbalanced cables. Its input is -10 dB. I don't have the money right now to buy a new monitor amp to match the digi002. I have tried both balanced and unbalanced cables and can't hear the difference. What do others with more experience suggest I do in this situation? i want to optimize what i already have.
__________________
— Jim
Here's my latest CD: The New Old Time.
Reply With Quote
  #2  
Old 01-12-2004, 10:32 PM
where02190 where02190 is offline
Member
 
Join Date: Jul 2001
Location: Boston, Ma USA
Posts: 8,145
Default Re: balanced to unbalanced

Use unbalanced cables.
Reduce your output volume to compensate for the difference in sensitivity.
Reply With Quote
  #3  
Old 01-12-2004, 10:33 PM
ejames188 ejames188 is offline
Member
 
Join Date: Jan 2004
Posts: 3
Default Re: balanced to unbalanced

I think the Rack also has RCA main outs as well. Wouldn't that work? It's easier than rewiring a new plug (which can be done.)
Eliott
Reply With Quote
  #4  
Old 01-12-2004, 10:37 PM
BenTerry BenTerry is offline
Member
 
Join Date: Jan 2004
Posts: 24
Default Re: balanced to unbalanced

You always want to use balanced cables whenever you can. These eliminate exterior sounds that could show up in your system. If you have your 002 plugged into the same generator as your TV or the Phone then you are at high risk of getting bleed just through the wall socket. Balanced cables will help eliminate a lot that. They do sound better but when you have an impedance mismatch then it doesn't really matter sonically but definately go balanced for the sake of eliminating as much noise from the outside world as possible.
__________________
Ben Terry
Reply With Quote
  #5  
Old 01-13-2004, 06:02 AM
dubaifox dubaifox is offline
Member
 
Join Date: Aug 2003
Location: Dubai U.A.E.
Posts: 1,243
Default Re: balanced to unbalanced

Quote:
They do sound better but when you have an impedance mismatch then it doesn't really matter sonically but definately go balanced for the sake of eliminating as much noise from the outside world as possible.
For every argument I have heard on this topic (as above), I have heard the counter one......."Use Unbalanced!! The floating wire picks up interference unless it is connected at both ends"

WHO KNOWS THE TRUTH!!

Maybe IDNMOFB (It Does Not Matter One Fu%$# Bit)

Who can say they really hear a difference between balanced and unbalanced cables going from balanced to unbalanced equipment. C'mon. (assuming they are of equal quality and equal length)
__________________
International Award Winning Arabic Fusion
www.ajmusiconline.com
---------------
2xMacPro 2.66,002r,OSX 10.4.10,PT 7.4cs8
3xVisionDaw,NI Komplete,Yamaha 01V/96
Reply With Quote
  #6  
Old 01-13-2004, 06:33 AM
where02190 where02190 is offline
Member
 
Join Date: Jul 2001
Location: Boston, Ma USA
Posts: 8,145
Default Re: balanced to unbalanced

sinc ethe end result is unbalanced into your amp, there is NO benefit to using a balanced cable, as the neutral remains floating, and the connections is still unbalanced.
I believe the other poster is correct, there are unbalanced -10dbv rca connections you can use. simply use RCA to unbalanced 1/4" cables, you you'll be perfectly matched. Just keep the length under 15 feet.
Reply With Quote
  #7  
Old 01-13-2004, 07:04 AM
ejames188 ejames188 is offline
Member
 
Join Date: Jan 2004
Posts: 3
Default Re: balanced to unbalanced

After thinking about it, are the RCA (unbalanced) outs on the 002R controlled by the volume knob on the front panel?
Reply With Quote
  #8  
Old 01-13-2004, 08:21 AM
dBHEAD dBHEAD is offline
Member
 
Join Date: Oct 1999
Location: Kansas City, MO USA
Posts: 678
Default Re: balanced to unbalanced

Balanced connections only reject spurious RF when the line is balanced on both ends. The principle is usually called "common mode rejection" and the idea is pretty simple. In a nutshell, the signal is sent down two lines rather than one, except that the two signals are 180 degrees out of phase with each other. On the receiving end, whatever is "common" to both will be "rejected." Since the two signals sent from the source will be 180 degrees out of phase with each other, the only "common" signal will be RF interference (usually hum/buzz from A/C power lines) it will be eliminated. This is because the RF signals will NOT be out of phase with each other. In other words, as a cycle reaches a positive peak in one it will also be reaching a positive peak in the other. Thus, that amplitude will be "common" to both lines and will be rejected.

As far as the impedance mismatch, I believe you can get impedance matching transformers to "step down" the impedance from +4 to -10. These usually are simply XLR-to-RCA connectors with pads built in.
Reply With Quote
  #9  
Old 01-13-2004, 08:43 AM
where02190 where02190 is offline
Member
 
Join Date: Jul 2001
Location: Boston, Ma USA
Posts: 8,145
Default Re: balanced to unbalanced

+4 to -10 converter.
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
Unbalanced/Balanced?????? kmusic 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 4 04-05-2012 06:19 PM
Balanced or Unbalanced? Vlad Drac Tips & Tricks 7 04-17-2007 01:47 PM
Balanced and Unbalanced Fishman1 General Discussion 2 09-25-2005 12:27 PM
Balanced or Unbalanced Ross H 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win) 1 01-12-2004 06:38 PM
Balanced or unbalanced stickstome2 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 2 01-12-2002 10:43 AM


All times are GMT -7. The time now is 05:01 AM.


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