Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Dual mixer facility
Dual mixer facility
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th January 2018, 08:13 PM   #1
Rick Kay is offline Rick Kay
diyAudio Member
 
Join Date: Jan 2018
Default Dual mixer facility

I manage a public venue. I have a full PA system with control room Allen & Heath mixer desk upwind and power amp stack downwind, all working well. For more casual use (dance classes, presentations etc) where the control room is locked I have a simple 8 channel mixer desk with limited functionality bolted to the wall in the main hall which can be used with minimal training. If both mixer line outputs are simply joined by Y junctions in the cables then on to the same power amp controller input, and if only one mixer is used/powered up at a time, are there impedance issues from the "off' mixer output affecting the "on" mixer. If so, are there any 'automatic' (foolproof) switching systems available?
  Reply With Quote
Old 18th January 2018, 10:41 PM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
If nothing else, such an arrangement is just screaming and begging to make ground loops and the attendant hum.

It might make sense to just have other small speakers for the small gigs. A small mixer and a couple powered speakers even. Those get set up for the gig and then stored. The beauty of that is you can also use them elsewhere.
  Reply With Quote
Old 18th January 2018, 11:22 PM   #3
Max Headroom is offline Max Headroom  Australia
diyAudio Member
 
Max Headroom's Avatar
 
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
Your 'Y Junction' method will probably work fine but is certain to be sub optimal because of possible back feeding/loading issues.
You properly need changeover switching in the signal chain probably at the amp rack and remotely controllable ie relay switching etc (Control switch at the 8ch desk position)
Alternately you could route the signals via a two input mixer stage and this will allow you to reduce gain for the 'punter' desk feed giving some system protection.

Dan.

Last edited by Max Headroom; 18th January 2018 at 11:27 PM.
  Reply With Quote
Old 19th January 2018, 05:44 AM   #4
Rick Kay is offline Rick Kay
diyAudio Member
 
Join Date: Jan 2018
Thank you Enzo and Dan, Ground loops, in particular, I can see would be a stopper. Both solutions offered make good sense. If I added a two Channel mixer would this be likely to downgrade the signal of the master desk?
  Reply With Quote
Old 19th January 2018, 08:34 AM   #5
chris661 is offline chris661  United Kingdom
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Quote:
Originally Posted by Rick Kay View Post
Thank you Enzo and Dan, Ground loops, in particular, I can see would be a stopper. Both solutions offered make good sense. If I added a two Channel mixer would this be likely to downgrade the signal of the master desk?
Depends on the mixer.

I'd try and find a rackmount zone mixer which has a couple of inputs, outputs, and options to switch between inputs. Nice simple signal chain in there - no tone controls etc to mess anything up. It'll be expecting line level, too - most small desks are geared up for mic-level signals on the XLR inputs, so you'd easily clip the input stage if you were feeding from another desk.

Chris
  Reply With Quote
Old 19th January 2018, 09:20 AM   #6
Max Headroom is offline Max Headroom  Australia
diyAudio Member
 
Max Headroom's Avatar
 
Join Date: Jan 2013
Location: West Australia, near to the beach, natural ambient sounds mostly.
I suggested a simple 2 input mixer for the ability to preset levels.

Sure to work and the simplest would be a balanced two input switcher, remotely controllable.
A rack mount box containing relays would be perfectly suitable and would serve as amp rack input selector.
The switching might need to be make before break to eliminate thumps/clicks when switching.

Dan.
  Reply With Quote

Reply


Dual mixer facilityHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
stereo mixer, pan or dual pot ? redrabbit PA Systems 4 17th December 2017 12:16 AM
Dual gang potentiometer for 'mixer' unbwogable Analog Line Level 1 8th February 2013 11:38 AM
Rockford Noise new facility - Clarion DXZ948RMP josesony68 Car Audio 21 9th March 2012 05:03 PM
National Ignition Facility in Panoramic High Res spopepro The Lounge 5 11th May 2011 04:19 PM
Reccomendations for a service facility. marsupialx Solid State 0 22nd July 2009 01:51 AM


New To Site? Need Help?

All times are GMT. The time now is 04:41 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki