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Hi everyone -
I am a performing musician and need assistance.
My rig:
Ibanez AEG10 Nylon
Fender NG 45SCE Nylon
Shure Beta 87 mic
Peavey PV10 mixer
FBT Jolly 8BA bi-amped speakers
VoiceSolo monitor
My problem:
PA BACKWASH. My FBT's sound wonderful outside if I have room to be a bit farther away, but can still can be gnarly. Inside it is a real challenge. I blamed it on room acoustics where I used to play, but now am in a different room and have same problem. At low volumes, Jollys sound fine. When I have to turn up because of crowd noise, BOY do I get low-end backwash! Especially in a reflective room with lower ceilings. It is around a B on my A-string; don't have a hertz chart nearby. Vocal in same freq range is almost as problematic, but the guitars pick it up SO badly! I try to capo a fret up or down to avoid it, but can't escape that freq. It is awful and affects my technique. I would LOVE to hear from a sound guru on this one. Speaker placement is a challenge...I'm unable to be too far away from them. Parametric a solution?? I have rolled off some low end at the cabinet AND a bit on my board, but it is not helping. Can someone go into the concept of backwash? Is it a problem with small speakers? NEED HELP PLEASE!!!
Follow Ups:
I guarantee its the beta 87
I did a large outside show and I had more feedback issues with those
things then you can believe and it was low end feedback
I swapped out all of the 87's on a break with Audix Om3's and wala
the low end feedback issues were solved instantly by dumping those
mics
I am not impressed with that mic and they are way overpriced
I highly doubt the problem is cabinet resonance
Im well aware of feedback suppressor issues
I just figured anyone who calls it back was has no clue and a feedback
destroyer would be an easy fix for him
Try a different mic instead of the 87
Which 87? There are two Betas to choose from. One is tighter than the other. The 87s have lots of grab, are very sensitive. The Audix are just the reverse, requiring more gain.
It comes down to knowing how to set gain structure, set up the FOH and MON systems properly.
Again, she is not having feedback per se. She is hearing the cabinet resonate at specific frequencies. All of the molded boxes are going to do that somewhat. You need a speaker with mass and internal bracing to minimize the phenomenon.
Cardiod pattern and I believe it is a condensor, and ya the Audix has a cardiod pattern but they are dynamic and well known to be able to get high gain and have high feedback rejection
I was not impressed with that model Shure whatsoever
I was impressed with the Audix mics
In fact I purchased some of them for my own collection
They are not colorated and you can get some serious FOH and Monitor
gain on them without worrying about feedback and tons of filtering
The beta 58 is a sweet mic but that 87 is way overpriced for what
it does for live music
That 87 might be sweet for studio work but not for feedback rejection
I am well aware of Audix. I have an Audix deal. The point remains that I have spoken off line with the original poster, and it has nothing to do with microphones. There is not a feedback problem. So, you no longer need to pimp Audix.
You assume that anyone that uses a Beta87 will have issues. I assert that only the wrong PERSONS using a Beta87 will have issues. This is equally true of Audix in the wrong hands.
If it was a cabinet resonance issue it would show up outside as well
She has no issue outside..NO room boundries
She has feedback issues inside and I would say your dead wrong
:)
Im not a spring chicken at this stuff
I have been doing pro audio for 25 years
Im not pimping Audix..I was merely point out that the Audix mics were
available at the show where the 87's were being used
We swapped out the 87's and there was no feedback issues
They suck..and are over rated and over priced
She is not noticing AS MUCH outside is what she told me. Of course she is noticing it more inside. She is playing small rooms, is close proximity to the walls, ceiling, etc. She can only notices it when she plays certain notes, AND IT IS ALWAYS THE SAME NOTES/FREQUENCY. How often do you have acoustic feedback or electronic feeback at the same note/frequency NO MATTER THE VENUE?
Besides that is an 8" loudspeaker in a tiny cabinet
I highly doubt there is even enough cone excursion to cause
that tiny little cabinet to resonate as your describing
She simply is having forward oscillation issues
:)
Cone excursion has nothing to do with it. Where do you get this stuff? You are saying a cabinet's resonate frequency is dictated by the limits of cone travel in and out? Whatever. Have you ever listened to a plastic speaker?
Dood
It aint the cabinets
She is playing an acoustic guitar and has gain issues
and she is using that freakin shure 87 mic to boot
You call her back and tell her to shut down the guitar and just
have the vocal mic on
Ask her if she has the problem
If not...then its the guitars/pickups and or mic she is using
for them
I have no idea what she is using with those acoustics
Yes I have heard the plastic cabs
And one other point here
If she is not using a pickup on that guitar and is sticking
the hole of the guitar up to a mic then there is a real chance
thats where her problem lies
Depends on the mic
Depends on the pickup on that acoustic guitar
Thats a real possibilty is the pickup on that acoustic and how
its installed
Some of those things can cause exactly what she is describing
Im saying its not cabinet resonance
Thats what im saying......
Your saying its the cabinet resonance...im saying its not
So I guess we disagree on that point
:)
Ok it seems your a newbie on filtering out feedback or frequency oscillation
so....
I would recomend a feedback supression unit thats automatic for you
Behringer has one that will do the job for you and read the instuctions
carefully and implement on your system and your problems will be
solved
Here is the unit on this link
- http://pro-audio.musiciansfriend.com/product/Behringer-Feedback-Destroyer-Pro-DSP-1124P?sku=182467 (Open in New Window)
That wasn't it at all, and those feedback suppressors suck. If you have to use one, you do not know how to use an EQ, set up your PA correctly, or set proper gain structure. If you don't know how to use an EQ, learn.
The deal is that the cabinets are plastic and resonating at certain notes. Plain and simple. In small rooms it was a problem that could not be addressed with EQ. I have spoken to the OP off line.
Poor speakers. Period. Those injection molded cabs are just resonating. The price you pay for that kind of thing I am afraid. You could try some spray acoustical dampening material. That won't completely knock it out, but it might help.
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