Oct 07, 2007 07:19 am The same thing that causes high end feedback.
The best thing you can do is get a 30-or-so band graphic EQ and ring out your room, getting rid of the bad frequencies.
Low end feedback
Posted on Oct 07, 2007 07:06 am
mclir9
www.witchsmark.com
Member Since: Aug 13, 2006
What causes low end feedback and how can I help prevent it??
[ Back to Top ]
Oct 07, 2007 07:19 am The same thing that causes high end feedback.
The best thing you can do is get a 30-or-so band graphic EQ and ring out your room, getting rid of the bad frequencies.
Oct 07, 2007 12:04 pm Bass traps in the corners of your room will help a little bit, as well... but really, dB's answer will help the most.
You could go through the trouble of 'listening' to your feedback through your software, and a frequency anylizer to determine the problem frequency, then adjust the EQ accordingly.
Oct 07, 2007 10:41 pm IF your talking about live situations, and this is gonna sound overly simplified, but mic and amp placement are a big thing. Bass drums elevated and such. I try to stay away from having to buy new gear everytime i encounter a problem.
Oct 08, 2007 07:11 am I ended up getting a Behringer FBQ3102 which is a 31-band EQ. After further discussion with my trusty GC PRo-audio guy, with my description of the layout of the band, the concrete patio of the Lions Club we were playing on, the placement of the Subs and Hi-Pacs, and the low-end humm we were getting when I tried to add any sorts of lows from my mixer to any of the mics - we realized that most of my problem was from bad placement and inexperience. He explained to me that no EQ in the world will fix bad placement of FOH speakers. I went ahead and got the EQ though because it wasn't real expensive and I figured I would probably benefit from this device regardless of my mistakes.
Oct 08, 2007 07:32 am Yeah, if you are talking about live situations, buying an EQ like you now have is necessary. Every room is different.
Every time you set up a room, the first thing you have to do is ring it out.
Set up a mic at your sound board and point it at a hipac, then turn up the volume until you get feedback, find that on the EQ and turn it down until it stops, turn it up again, find and fix, turn it up again until feedback, find and fix...you will find the feedback usually goes from highs to lows a few times. After 6-7 times you will get the worst frequencies in the room under control and give more headroom to your system.
Oct 08, 2007 11:40 pm www.realtraps.com/sbirlbir.htm
yeah, you're placement and your room modes are what's causing the feedback....check out this calculator and you can figure out some of your 'problem frequencies' just from knowing the size of the room you're in. remember floor to ceiling distance will also have a factor, corners 'build up' low end pretty bad.
simple physics really, good stuff!
Oct 08, 2007 11:40 pm Deleted By whosyourdaddy00
Dec 19, 2007 04:49 pm Use the hi-pass filter on all the mic channels
Dec 19, 2007 05:06 pm I think the above info probably has you covered but just wanted to add that electro acoustics can cause low end feedback as well. You can get a plug for the soundhole that will help. I doubt this is the case though as you can literally feel the vibration from the acoustic.
Dec 19, 2007 05:48 pm I use a dba Driverack... auto roomtuning and feedback suppression... works great.
Jan 01, 2008 12:59 am All the information givin is good. But, lets not forget about the Biggest thing. Gain Structure! Gain Sturcture! Gain Structure!!! can not stress that enough! If you have poor gain stucture, no amount of placement, EQ, or compression will help!
|
Related Forum Topics: |
If you would like to participate in the forum discussions, feel free to register for your free membership.