low end feed back

[Darko74]

im playing in a wedding band, our singer does the sound(but he doesnt really have a clue) lately on certain gigs i've experienced some low end feed back or boomy sound with certain notes i play. its not coming from my amp. seems to happen on stages. is it my bass amp rumbling through the stage and being picked up by bass drum mic ect? ps im going str8 from my DI on my tc rh450 to desk.
Thanks in advance for any info

 

[Floyd Eye]

Sounds like the kick mic in the subs. It's either too loud or the low end gain on the crossover is too high.

 

[DuraMorte]

Sounds like the kick mic in the subs. It's either too loud or the low end gain on the crossover is too high.

Or the kick mic picking up some bass from the subs at certain resonances, one of the two.
Best solution is to gate the holy bejesus out of the kick. Assuming that's an option.
If not, pull some low end out of the mix altogether. If you're getting that much feedback, there's something way too hot. IMO, etc. etc.

 

[Floyd Eye]

Or the kick mic picking up some bass from the subs at certain resonances, one of the two.
Best solution is to gate the holy bejesus out of the kick. Assuming that's an option.
If not, pull some low end out of the mix altogether. If you're getting that much feedback, there's something way too hot. IMO, etc. etc.

Yep.

 

[Dantreige]

That's a tough question to answer. I could be many things. Without knowing your whole setup, number and type of drum mics and their placement, FOH speakers, mic types and number of singers, monitor set up, backline amp and placement, etc., etc.

General advice: If you are getting low end rumble or feedback on certain notes only, you could be dealing with room mode problems. (Do a seach and learn about this. Too much to go into to explain it properly.) Moving you cab slightly can get rid of that problem. (It could also cause an issue in a different area.)

A mic could be the problem as well. I would check the placement of the drum mics first. Also, if you are boosting frequecies on a drum mic too much, it can cause problems. If you lower the eq or change the frequency if you have a sweepable mid, can you get it to go away?

High passing the vocal mics can clean things up too. Most newer boards have a 75 or 80 high pass button on each channel. This can really cut down on boomyness on stage.

That last thing I would suggest is lowereing the bass on your amp. If you have a full pa (subs and tops) you can often cut the lows on our rig by a huge amount. This will help clean up the sound on stage as well as let the pa do the heavy lifting on the low end.

If you could give a better discription of your overal set up, we could help you pinpoint the issue.

Good luck!

 

[thumbknuckle]

Somebody needs to put on the headphones and track down where it's coming from.

I concur with most everybody else: first place I'd look is the kick drum mic. The head is probably resonating sympathetically with the bass notes and forming a feedback loop, this is incredibly common.

 

[Darko74]

Thanks guys. Tonight i took my sansamp DI to my gig. large enough room. i zeroed(flat) the desk. i raised my cab off the stage a little. i took a long lead and stood out and played with the band( dont usually get a chance to sound check as rooms full of wedding peoples). got a really good sound by fine tuning sansamp. left my EQ flat on desk.
thanks again. i still think problem might have been kick mic and maybe got lucky with room tonight. or the fact i took a bit of control over my sound helped

 

[uhdinator]

Hollow stages can resonant into all mic's on stage. Once had a rumble ands stomped around on stage to zero in on it.
It was a round base mic stand that had no rubber pads on the bottom that was on a hard wood floor in front on a mic'd guitar cab. Put a folded up wet bar towel under it. Use the low cut switch on all mic's on stage except the kick and bass channel. 160hz area is often a problem area too.

 

[lowfreq33]

Probably the kick mike. Do you guys have graphic eq's on the monitors to notch out problem frequencies?

 

[Darko74]

Probably the kick mike. Do you guys have graphic eq's on the monitors to notch out problem frequencies?

only to monitors on stage. no bass going through them. only vocals and a bit of keys. last night i got a really good sound. not sure if i got a lucky with the room. really wish i knew more about sound.

 

[Floyd Eye]

I can tell you that from one room to the next you will have to change gain levels on your kick mics.

 

[Ric5]

Sounds like the kick mic in the subs. It's either too loud or the low end gain on the crossover is too high.

The bass notes can resonate inside the kick drum ... the kick drum mike needs to be gated ...

Also any 4x12 sealed speaker cabs can rumble low mids.

 

[Floyd Eye]

The bass notes can resonate inside the kick drum ... the kick drum mike needs to be gated ...

I'm sure you're right. Does the OP have limiters/gates at his disposal though?

I have this same thing happen sometimes and I eliminate it usually by cutting the low gain on the x-over a little bit. Certainly not ideal I'm sure, but I have no gates or limiters either and we manage to sound pretty good and with 2 1x18" subs and an XTi2000 the kick is always plenty loud.