Feedback destroyers

[theshadow2001]

Since feedback seems to be such a problem when amplifying upright bass. Im wondering does anyone use feedback destroyers such as these. Or are they of any use to an DB player at all?

[Johnny Atomic]

check the archives at rockabillybass.com.

there have been some folks that have used the behringer feedback things (Shark???) w/ varying results. Some swear by them, but they spent a lot of time in the front end programming the thing using a tuner, and letting it feedback, figuring out the frequency from the tuner, adjusting that frequency on the feedback buster, then doing it again and again, and getting the 4 or 5 frequencies that are most likely to feedback.

But then again I haven't tried it.

Johnny

[theshadow2001]

The sabine one seems to be a little more sophisticated than what berhinger offer. (and about 5 times the price) If you look at the quick guide it seems quite simple to use. I'll check out rockabillybass

[ToneRanger]

From the Sabine specs: "Filters are placed almost immediately (in 0.4 seconds at 1 KHz.)"
I'd be concerned about whether it can tell the difference between feedback and a sustained note, especially if you play arco.
First time I heard one of these, a sound guy inserted it across the whole mix and wondered why the flute kept disappearing. They're pretty good at removing organ sounds from the mix too. I don't know whether URB has enough sustain and pure enough tone to have this problem.

[seamonkey]

I tried the behringer last night with my pulse pickup.
Very impressive. You push the auto button and it sends out series of pulses, increasing the volume, when it detects feedback it throws a narrow notch at it. Notches are only as deep as they need to be. It's fast for high frequency feedback, but slower for low frequency. It took a couple of seconds to notch a low howl. It jumps right on squeals.

After setup, Very little change to the overall sound, except you can get very loud. I'd even suggest the sound is now more even. It makes sense as it's just trying to flatten the frequencies. I might run one through an RTA to see what it looks like.

If you leave it in "run" mode it will detect sustained notes as feedback and try to notch them. But, if after it runs the initial setup, you hit the freeze button, it just sticks with what it found during setup.

Any left over filters can be used as parametric filters.

Nice unit.

[Johnny Atomic]

Seamonkey,
Are you using the Behringer feedback destroyer (1 rack space), or Behringer Shark (much narrower size than 1 rack space).

Has anybody tried the shark????


Johnny

[seamonkey]

FBQ2496 1u rack.

I haven't tried the shark. I think it's older technology.

[theshadow2001]

Has anyone heard of the term ringing out a system? Where you increase the gain on a PA(with mics live but no sound going through it) till the point where you just start to get feedback. You bring the gain back a bit and then start pushing each band on a graphic equalizer up to see if you can return to the point where your just getting feedback. If you push a fader up on the graphic and you get no feedback you then return it to zero since that is not an offending band. If you push it up and the system returns to the point of just feeding back. You cut that band by the same amount you boosted it. Once you've gone through the full spectrum of bands you turn the gain up some more and repeat the process. Doing it two or three times in total. Once finished you have cut out the frequencies that are going to give most trouble in terms of feedback

if you had a graphic eq(a decent one like a 32 band) hooked between the pickup/mic and amp, would ringing out your doublebass in the same manner not be the same/better than the feedback destroyers?

[seamonkey]

Feedback destroyers have notch filters that are 1/60th of an octave. The best EQ is 1/3rd octave.

[Johnny Atomic]

Do you run the behringer in the efx loop of your amp????

[Tactician]

You would probably be better with a 25 band EQ. You could just remove the problem frequency (which will be different for each room you play in BTW). In the 60's we'd fill our Rickenbacker guitars with cloth to stop this problem - but you'd need quite a bit for a d bass. About 30 sets of woolly pyjamas should do it!! (You don't want to lift the bass after this do you?)

[seamonkey]

Originally Posted by Johnny Atomic

Do you run the behringer in the efx loop of your amp????

It does need line level I/O. I have it currently inserted after the preamp from the piezo. I also tried in the efx loop for a channel, with the efx level all the way up. They both ways seems to work fine.

[Ric Vice]

Originally Posted by seamonkey

I tried the behringer last night with my pulse pickup.
Nice unit.

Sea Monkey,
What is a "Pulse Pickup" I'm in the dark here.

Thanks

Ric

[mr.hughes]

On a tangent, the best feedback destroyer I've come across is a Fishman Dual Parametric DI. At the first sign of feedback just flip the phase switch, (which knocks the outgoing signal off from the incoming by a few milliseconds) and the feedback is gone.

I've found this to work in even extreme settings, with serious low-end or high-end feedback. Plus, if the problems persist you still have two channels of parametric EQ to use.

Sadly discontinued a few years ago and replaced with the Fishman Pro-EQ Plantinum Bass preamp. Whilst this unit has a compressor onboard, my vote still goes for the Dual Parametric as the most flexible/usable pre for fighting feedback/reproducing a good, solid Double Bass sound.

If you see one on eBay it's well worth the price.

[seamonkey]

Originally Posted by Ric Vice

Sea Monkey,
What is a "Pulse Pickup" I'm in the dark here.

Thanks

Ric

what is your favorite pickup?

YMMV

[GRAHAM SG1]

I am thinking about egtting one of the below, does anyone have any view on them, are they any good, how many inputs do they have etc

Thanks

http://www.google.co.uk/products/cat...d=0CCAQ8wIwAQ#