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G or A Feedback

R

RicBerkley

Jan 27, 2011
3
0
#1
I play a Fender Dimension IV with active EMG pups and EQ onboard, thru a Hartke LH1000 head with a BBE Compressor. Cabs include a Hartke 410 Hydrive and a Hartke 15. Problem: I have a constant feedback anytime I play a G note...no matter what octave..but worse the higher up the neck I play. with all of the EQ adjusting ability between the guitar and amp, I can't get rid of it. It seems to reverberate through my drummers toms, but I hear it mainly in the 410 cab. It sounds like a harmonic that rings on forever. Help please...how do I get this out. :hyper:
 
#2
Some bass cabs will resonate at certain frequencies. Also some preamps can exxagerate this as well.

Set the tone knobs flat and the eq flat on the bass and amp. Then start to adjust the tone to get what you want.

If you have a graphic eq try cutting back the 100hz level. If you have 4 tone knobs try cutting bcak the low mid knob. The bass knob may also be part of the problem.
 
#5
Thanks Ric5. We tried those adjustments too....started with a flat setting then adjusted as possible without totally destroying the lows and low-mids. I started with all EQ settings flat on both the guitar and amp, then started cutting. I got it to diminish, but could not stop it. In my post, I mentioned I tried both a active bass and a passive bass without any difference.
I think I need to see if I can borrow a different cab somewhere...if it still does it, at least I have eliminated one possibility. I'm open to other ideas.
Salamenster....I really like the bass. It has a Jazz shape neck but with 24 frets like the old Fender Jazz24. Stock it has passive pubs with active EQ, but I replaced it with EMG actives...both the pups and EQ. With 18 volts, there is plenty of headroom and control... They also made a 5 string, the Dimension V. Hard to find.
 
#6
What are the dimensions of the room? Is there any sound deadening material in the room? If you take your setup and move it to a different room or a differnent location within your current room, does the problem go away (or move to a different frequency)? This could easily be a room resonance issue rather than an equipment problem.
 
#7
It has been it's worse outside under a constructed ceiling like a gazebo with a building about 15ft behind, but I have also had it indoors is a small bar room estimated at 50'x50' with low acoustic ceilings. I've had the problem on a elevated stage that is a 1920's circa sound stage designed for acoustic performances, and in a large venue 200'x200' with 50ft ceilings. That's is part of what is driving me crazy, there is no rhyme or reason to this and I have very limited success in dialing out the "EQ" with my guitar(s) and amp. When plugged into the mixer, our sound guy has success with the rack EQ dialing it out, but I can't get if out of my cab on stage. Help please....I'l going nuts with this! Thanks :hyper:
 
#10
Thanks for the EQ advise. While I don't have a 7, 10 or higher slider EQ (floor or rack) I do have an active EQ on the bass that is sweepable. The amp has bass, mid, and treble cut/boost. I still could not get it out. What is strange, is that it happens on any octave of G....and I have four with a 24 fret neck.
I have not tried a different amp, but I have used separately and together a Hartke 410 and a Hartke 115...both and together still product the harmonic feedback. It resembles the A harmonic common with acoustic guitars.
What I did do was change strings. This past weekend I played at a place that I have not had the problem. I won't be back at one of the venues that always gives me a fit for two weeks.
I'll report if the string replacement works.

Thanks everyone for their feedback. This has been very strange and frustrating...I appreciate it.

Bass Players Rule!:bassist:
 

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