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FDP Forum / Amp Mods, Repairs, and Projects / GK 2X10 Combo Buzz

Tori

usa

"You don't know what you don't know"
Jan 6th, 2019 04:07 AM   Edit   Profile  

My GK 2X10 speaker cabinet buzzes with certain bass notes. At a lower volume, the bass cab plays fine but louder something goes sideways.

What is the best way to check for a blown speaker vs a wiring problem?

Te 52

Laws of Physics

strictly enforced
Jan 6th, 2019 10:37 AM   Edit   Profile  

The classic troubleshooting technique would be to swap out speakers, one at a time.

But it sounds like you're ignoring the possibility that it's just something loose and rattling When things only buzz at certain frequencies, that's something to look for.

Tori

usa

"You don't know what you don't know"
Jan 6th, 2019 11:50 AM   Edit   Profile  

I am not ignoring but hoping it is something easy! But thanks for the advice on the speakers.

Doc Sarvis
Contributing Member
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USA/Salt Lake City

Tuned Strings and Tight Lines
Jan 6th, 2019 12:09 PM   Edit   Profile  

In my experience truly blown speakers don't sound fine at any volume level so TE 52 offers good advice.

I once had a persistent buzzing issue with my DRRI. Upon closer inspection the power cord was resting on the basket.


Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 6th, 2019 04:50 PM   Edit   Profile  

Buzzing only on certain notes usually indicates a resonant frequency issue--meaning something mechanical (vibration in the chassis or cabinet).

With speaker cabs and combo cabs, what often sounds like a tone or buzz from the speaker itself is actually something buzzing in or on the cabinet.

Check all speaker mounting nuts/screws for snugness.

Check all chassis mounting screws. Captive nuts on a metal amp chassis are often loosely attached and can buzz pretty loudly.

Check all control pot knobs and nuts, as well as jack mounting nuts on the front and rear of the chassis. One loose nut that allows a washer to vibrate can drive you bananas because you can't see them.

Check all speaker components; the rivet on the little waferboard that holds the speaker terminals sometimes works loose. You can fix this with a drop of CA adhesive.

Check all handle hardware, as well as the screws that hold the metal or plastic corner protectors on the cabinet.

Check all wiring to make sure it's securely held and not rubbing on anything. Use zip ties or hot snot to hold it in place.

Check all baffle mounting screws.

Check all parts of a removable grill to ensure it's solidly held in place. Metal grills are notorious for making noise if a screw is even a little loose.

A really good way to isolate the cause of the noise is to have someone play the offending note on the instrument and hold it (replicate the problem), while you apply a fingertip to various parts of the amp, inside and outside. Light pressure on a loose or noisy part will silence it.

Don't poke your fingers anywhere inside the amp's chassis tho!

If you do determine it's possibly something inside the amp's chassis, remove the chassis from the cabinet and play the amp. This isolates the chassis from the speaker and cabinet. If the problem goes away, it's the chassis or something in it/on it.

If the problem persists, it's the cabinet or speaker.



FDP Forum / Amp Mods, Repairs, and Projects / GK 2X10 Combo Buzz




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