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Question:

I wrote this assuming the feedback was coming from the PA.  Is it possible that you are mistaken, that the low noise was not coming from your amp?  If your bass amp is not connected to your microphone in anyway, and the other issues that the first person responding to your post said are not the case, it is difficult to believe that the noise is coming from your bass amp.  It is not possible that your microphone is effecting the bass amp if it is plugged into the board and your amp is not connected to the board in anyway. Keep in mind that low frequency noise without any upper harmonics is not very directional and as a result it is difficult to determine exactly where the noise is coming from. First off neglect the floor, it is most certainly not the problem.  If there was enough energy coming through the floor to excite the microphone you would be feeling a considerable amount of vibration through your feet. Besides it would be necessary to have your stand mounted on spring isolators with a relatively high deflection (1/2") in order to take care of low frequency noise. what type of microphone are you using?  Some of these questions may seem silly but I am not sure the degree you have looked into the problem.  Is the microphone omi-directional or cardiod?  The feedback loop is because it is picking up information from the monitors, or the house speakers, regardless if it is picking up information from the bass amp.  Obviously you want a microphone cardiod and you should point the back of the mic at the monitor, or house speakers if they are firing back at you. The frequency response of your micrphone is also important.  Most live mics (sm58s), roll off all the lows to make up for the proximity effect (the closer to the microphone you get, the bassier it is).  This also helps in reducing feedback problems because bass frequencies are less directional than higher frequencies which means that cardiod microphones act more like omi-directional microphones in the lower frequencies. Sing kissing the microphone.  The lower you keep your gain to the pa, the less feedback you will get from your mic.  Because of how live microphones work, there is a considerable amount of signal gain that can be obtained by standing as close to the mic as possible.  If you are singing 4 inches from the micrphone, it will be necessary to increase the gain on the board significantly more than would be necessary if you have your lips touching the mic. you are not micing the bass drum are you?  That could be a source of your problem as well. Well if you have more information availble, I would be more than happy to help trouble shoot your problem some more. aaron An obvious statement, but pull your microphone as far away from your cabinet as possible. – Hide quoted text — Show quoted text – > OK now. To clarify a point, the mic is not hooked into my bass rig, it’s > connected to the PA input. I haven’t tried repositioning the mic closer, > further, or higher yet. The mic stand is on a tripod stand, so I’m not sure > how to isolate it. Even if I could, why don’t the other players mics pickup > the Bass effect? Then again, when I first noticed the boomy sound, my cab was > up on a caster stand, not directly lieing on the ground. Hmmmm. Any body got > any further views? > joe > ->It sounds like the feedback was coming through the floor, > -> not into the front of the mic.  Some way of isolating the mic > -> should help.  There are solutions to this..it’s common.  Isolating > ->mic holders, pads under the stand, and many more remedys > ->are available.  The NG is probably full of neat, home made > ->solutions. > Many, if not most, P.A. mixers have a low cut filter that can be engaged, > and there is seldom a reason not to use it on most channels of the board. > If there is one, it may help with this problem. > Michael > — > "I don’t want to achieve immortality through my work.  I want to >  achieve immortality by not dying."  – Woody Allen > —–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– > http://www.newsfeeds.com – The #1 Newsgroup Service in the World! > —–==  Over 80,000 Newsgroups – 16 Different Servers! =—–

Response:

OK now. To clarify a point, the mic is not hooked into my bass rig, it’s connected to the PA input. I haven’t tried repositioning the mic closer, further, or higher yet. The mic stand is on a tripod stand, so I’m not sure how to isolate it. Even if I could, why don’t the other players mics pickup the Bass effect? Then again, when I first noticed the boomy sound, my cab was up on a caster stand, not directly lieing on the ground. Hmmmm. Any body got any further views? joe – Hide quoted text — Show quoted text – > ->It sounds like the feedback was coming through the floor, > -> not into the front of the mic.  Some way of isolating the mic > -> should help.  There are solutions to this..it’s common.  Isolating > ->mic holders, pads under the stand, and many more remedys > ->are available.  The NG is probably full of neat, home made > ->solutions. > Many, if not most, P.A. mixers have a low cut filter that can be engaged, > and there is seldom a reason not to use it on most channels of the board. > If there is one, it may help with this problem. > Michael > — > "I don’t want to achieve immortality through my work.  I want to >  achieve immortality by not dying."  – Woody Allen

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Response:

It sounds like the feedback was coming through the floor,  not into the front of the mic.  Some way of isolating the mic  should help.  There are solutions to this..it’s common.  Isolating mic holders, pads under the stand, and many more remedys are available.  The NG is probably full of neat, home made solutions. – Hide quoted text — Show quoted text – >I had a problem last night with  low boomy noise coming from my Bass >rig. At first, I turned down the bass control on my Bass, then I cut the >EQ signal on my amp, but to no avail. The only thing that changed from >last weeks setup, was I added a vocal microphone for myself, and placed >it about 4 feet in front of my 1×15 cab. The mic was placed a little off >to the right and was pointed at a 45 degree angle facing the cab.  I >identified the problem by just turning off the mic, and the boom was >gone. So it appears I’m picking up feedback coming from my rig through >the PA system. I tried cutting the bass frequencies through the PA EQ., >but that didn’t help. Any suggestions? >—–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– >http://www.newsfeeds.com – The #1 Newsgroup Service in the World! >—–==  Over 80,000 Newsgroups – 16 Different Servers! =—–

Response:

I think what the original message is referring to is the sound from the bass amp being picked up by the microphone, going through the PA where it is then coming out of the main PA speakers (and monitors, probably) with all of the reverb and vocal effects on it which, blended with the original sound coming out of the bass amp, sounds like crap.  I’ve had this happen too and it sounds. . . well like I said, like crap.  I think all you can do is move stuff around to minimize this effect.  Although there are days when I’m ready to try your "puddle of water idea!" – Hide quoted text — Show quoted text -> Thinking out loud (electronically, if you can do that):  Are you sure it’s > feedback?  Your vocal mic shouldn’t be connected in any way to your bass > amp, so there’s no loop there for feedback.  Is your bass amp going to the > board direct?  Are you miking the bass amp?  Sometimes, your amp can excite > resonant frequencies in the room and induce feedback in the loop that > consists of your mic and the PA, but you say that the noise is coming from > your amp, not the PA.  If it is coming from the PA, change your vocal mic > position relative to the vocal monitors and PA mains, and move the mic away > from reflective surfaces that might be echoing back to it.  Is it a cardioid > mic? > If the noise is constant, and doesn’t seem to amplify itself, then that > doesn’t seem to indicate feedback.  Maybe you’re getting some hum induced by > a transformer — move the mic all over the entire room and see if that > affects the noise.  Put someone else’s mic in the same spot, using the same > cable, to see if it’s your mic that’s the problem.  Try a new mic cable, > maybe you grabbed one with a bad ground.  Try plugging your bass amp and the > PA amp into the same outlet so you reduce ground loops or stray voltages. > Try ungrounding the amps and play while standing in a puddle of water — no, > wait, better not do that.  I’m out of ideas, good luck.

Response:

->It sounds like the feedback was coming through the floor, -> not into the front of the mic.  Some way of isolating the mic -> should help.  There are solutions to this..it’s common.  Isolating ->mic holders, pads under the stand, and many more remedys ->are available.  The NG is probably full of neat, home made ->solutions. Many, if not most, P.A. mixers have a low cut filter that can be engaged, and there is seldom a reason not to use it on most channels of the board. If there is one, it may help with this problem. Michael — "I don’t want to achieve immortality through my work.  I want to  achieve immortality by not dying."  – Woody Allen

Response:

Thinking out loud (electronically, if you can do that):  Are you sure it’s feedback?  Your vocal mic shouldn’t be connected in any way to your bass amp, so there’s no loop there for feedback.  Is your bass amp going to the board direct?  Are you miking the bass amp?  Sometimes, your amp can excite resonant frequencies in the room and induce feedback in the loop that consists of your mic and the PA, but you say that the noise is coming from your amp, not the PA.  If it is coming from the PA, change your vocal mic position relative to the vocal monitors and PA mains, and move the mic away from reflective surfaces that might be echoing back to it.  Is it a cardioid mic? If the noise is constant, and doesn’t seem to amplify itself, then that doesn’t seem to indicate feedback.  Maybe you’re getting some hum induced by a transformer — move the mic all over the entire room and see if that affects the noise.  Put someone else’s mic in the same spot, using the same cable, to see if it’s your mic that’s the problem.  Try a new mic cable, maybe you grabbed one with a bad ground.  Try plugging your bass amp and the PA amp into the same outlet so you reduce ground loops or stray voltages. Try ungrounding the amps and play while standing in a puddle of water — no, wait, better not do that.  I’m out of ideas, good luck.

Response:

I had a problem last night with  low boomy noise coming from my Bass rig. At first, I turned down the bass control on my Bass, then I cut the EQ signal on my amp, but to no avail. The only thing that changed from last weeks setup, was I added a vocal microphone for myself, and placed it about 4 feet in front of my 1×15 cab. The mic was placed a little off to the right and was pointed at a 45 degree angle facing the cab.  I identified the problem by just turning off the mic, and the boom was gone. So it appears I’m picking up feedback coming from my rig through the PA system. I tried cutting the bass frequencies through the PA EQ., but that didn’t help. Any suggestions? —–= Posted via Newsfeeds.Com, Uncensored Usenet News =—– http://www.newsfeeds.com – The #1 Newsgroup Service in the World! —–==  Over 80,000 Newsgroups – 16 Different Servers! =—–

Response: