Problem with Live sound - diyAudio
Go Back   Home > Forums > Live Sound > PA Systems

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

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 19th October 2011, 03:20 PM   #1
diyAudio Member
 
Join Date: Oct 2011
Default Problem with Live sound

[help=
Im currently trying to figure out what is going wrong with my system. I'm thinking it's the age of the mixer and needs to be replaced.

My situation is that I have 14 Audio Technica goosneck mics (49Q pro / AT81615RS) connected to and old 16 xlr Mackie mixer with 2 crown amps broadcasting to 12 overhead speakers. The speakers are a good 40 feet up over the mic. I have the mixer at about 1/2 gain, anymore I get feedback, the channels at about 0 to +20. Phantom is on. The problem is that it should be a nice volume but it comes out very soft and I have the volume at about 75 to 85%.

Is the mixer the problem or am I missing something? If more information is needed I can fill in holes.
][/help]
  Reply With Quote
Old 19th October 2011, 03:23 PM   #2
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Are all 14 mics open at once? Even with the speakers 40 feet up (that's a lot), you're still asking for trouble. Did you ring out the system to find your feedback frequencies?
__________________
Take the Speaker Voltage Test!
  Reply With Quote
Old 19th October 2011, 03:31 PM   #3
diyAudio Member
 
Join Date: Oct 2011
No I have not. The mixer has somewhat of an EQ but not really anything special not to mention the room is sharing a wall next to a commercial freezer and washroom. Open doors and and HVAC unit. So the ambient noise in the room changes a lot. Never had an issue using 58's in the room but switiching to condensors makes a world of difference. You think maybe getting a better mixer would help this?
  Reply With Quote
Old 19th October 2011, 03:37 PM   #4
diyAudio Member
 
Join Date: Nov 2008
A Dugan automatic microhone mixer could be the answer. E
  Reply With Quote
Old 19th October 2011, 03:43 PM   #5
diyAudio Member
 
Join Date: Oct 2011
The Dugan is nice but kind of out of the price range.
  Reply With Quote
Old 19th October 2011, 03:51 PM   #6
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
SM58's are reputed to respond only to mouths right in front of them. That is why they sell so many. See this thread where a new SM58 purchaser is complaining they only have sensitivity right in front of them. Reduced Output Level from a Dynamic Mic Right.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 19th October 2011 at 03:55 PM.
  Reply With Quote
Old 20th October 2011, 12:01 AM   #7
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Are these mics right in front of mouths? Or is this a conference table sort of situation, or some kind of panel discussion? SInce they are goosenecks, I am guessing this is not a choir or musical group.

COnsider some PZM mics. They can be placed in the center of a conference table without sounding way off mic. They also work sitting on the surfacce of a lectern rather than sticking up in the air. They are made specifically for this sort of thing.

I doubt there is anything wrong with the mixer, but if you made wholesale changes to the microphones, then I imagine your system needs to be EQed from scratch.

Has the room installation been EQed ever? DO you run a graphic equalizer between mixer and amplifiers? ANd the brute strength approach would be to add a feedback buster unit to the system
  Reply With Quote
Old 20th October 2011, 03:12 PM   #8
diyAudio Member
 
Join Date: Oct 2011
No the room has never needed to be EQ'ed mainly for reasons that they are using it for not its original purposes. The mics were setup in a hollow square table formation so every one in the meeting could make eye contact. I have never had to EQ the room but this is also the first time that I have used this many condensor mics in the room together.
  Reply With Quote
Old 21st October 2011, 05:23 AM   #9
diyAudio Member
 
ianpengelly's Avatar
 
Join Date: Oct 2006
The pickup pattern of the mics is probably your issue, as I would expect like a lot of condenser mics they are good at picking up ambient sounds, which is both a good thing and a bad thing depending on the application. As other people have suggested, get an EQ (Behringer do a relatively cheap unit with feedback detection that you can use to quickly identify the problem frequencies and attenuate them) and try and tame the system.

Is it quite a hard surface room as well?
  Reply With Quote
Old 22nd October 2011, 12:39 AM   #10
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Seriously, look up PZMs - "pressure zone microphones"

It is a type of mic, not a brand name. Crown made them first, I think, but nowdays many make them. Even if they are not what you seek, the information on them may be illuminating to your situation.

I agree with the above poster who suggested pickup pattern as the issue. An omnidirectional mic will tend to feed back more than a cardioid. I don't think the condenser-ness is the problem.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The Demise Of Live Sound (Digital Live Systems) mrfeedback Everything Else 2 17th March 2011 02:05 PM
New Live sound Tapped horn CuttaBoi Subwoofers 5 6th September 2010 04:25 AM
How to achieve the LIVE sound? Like you ARE THERE? rjp366 Multi-Way 52 12th October 2009 04:39 PM
Why do good speakers make it sound like it was live!!!!!!!!! bob123 Multi-Way 26 29th August 2006 01:28 AM
Sound Blaster Live Processor audioaction Parts 7 29th July 2003 08:18 AM


New To Site? Need Help?

All times are GMT. The time now is 08:39 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2