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Buzz from Electric Piano

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Buzz from Electric Piano

Postby peddlebreaker » Tue Apr 15, 2014 8:47 am

Hi there,

Recently I recorded a jam session at our community music studio, one of the guys jumped on a Yamaha stage piano which has jack output sockets, so I used A jack lead coming out of the piano and plugged it straight into the wall-box in the studio.

This is fed into another wall-box in the control room whereby we have a loom of balanced jack cables coming out and into the mixing console (Soundcraft Ghost).

There was a terrible buzzing from the piano and to be honest we could not use it. We tried a different lead but it was still there.

Could this be because the jack leads we were using were not balanced?

Thanks

:D
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Re: Buzz from Electric Piano

Postby G-Doubleyou » Tue Apr 15, 2014 3:53 pm

A better choice may have been to use a DI box, or mic the speakers.

8-)
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Re: Buzz from Electric Piano

Postby peddlebreaker » Wed Apr 16, 2014 10:51 pm

Thanks G, yeah I guess I should have used a DI box. I am curious though, I thought that our wall-boxes were acting like DI boxes, taking the line level signal all the way through to the control room?

Thanks again for your help

Cheers
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Re: Buzz from Electric Piano

Postby hollowsun » Thu Apr 17, 2014 6:00 am

Buzz or hum?

If the latter, mains loop. Go via a DI box and lift the earth.

What were the connections on the wall box - XLRs or jacks?

Unbalanced shouldn't present a problem especially at line level on short(ish) cable runs. Ideally, balanced is best either on TRS or XLR but not always practical ... or even necessary at line level (for short(ish) cable runs).

None of my stuff is balanced ... never has been in 35 years - not a problem. But I don't have long cable runs. Clean as a whistle!

I suspect an earthing problem/ground loop in your situation. There are various remedies, some safe (like DI boxes with a ground lift), some not so (like taking the earth off the mains plug ... which might be ok temporarily ... but not really recommended).

If the former (buzz), that's something else ... RF interference, whatever.

Either way, it strikes me that your community music studio is inadequately wired up and plumbed in.
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Re: Buzz from Electric Piano

Postby peddlebreaker » Thu Apr 17, 2014 8:26 am

Thanks for your reply Hollowsun.

That's great advice, I would like to get to the root of the problem, so I will open up the wallboxes and take a snap so that you can see how we wired it all up. Unfortunately and rather embarrassingly we are not very experienced in wiring, something that I am learning more about every day.

I'll get back to you

Thanks again

Benny
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Re: Buzz from Electric Piano

Postby Hugh Robjohns » Thu Apr 17, 2014 9:06 am

This is almost certainly a simple ground loop problem, possibly conflated with some unbalanced cable interference.

The best and easiest solution in your situation is to use a DI box.

H
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Re: Buzz from Electric Piano

Postby G-Doubleyou » Thu Apr 17, 2014 9:44 pm

peddlebreaker wrote:Thanks for your reply Hollowsun.

That's great advice, I would like to get to the root of the problem, so I will open up the wallboxes and take a snap so that you can see how we wired it all up. Unfortunately and rather embarrassingly we are not very experienced in wiring, something that I am learning more about every day.

I'll get back to you

Thanks again

Benny

Also check the piano, it could generate noise at extreme settings.

8-)
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Re: Buzz from Electric Piano

Postby zenguitar » Fri Apr 18, 2014 12:23 am

Hmmm...

Are you sure you picked the right user name?

One thread about buzz from an electric piano after someone jumped on it, and another thread about fixing a pair of one of the most robust headphones ever made.

Just pondering out loud ;)

:D

Andy :beamup:
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Re: Buzz from Electric Piano

Postby peddlebreaker » Wed Apr 23, 2014 8:24 pm

Aha, yes tis me the breaker of all things!

Truthfully, I am about to embark on a significantly important sonic journey and so usually at this point, before I step aboard, I fire a load of questions off that have been building up inside me for months.

Actually, I have another completely unrelated query about a microphone, and you guessed it; a broken one (I think). Keep your eyes peeled :))))

By the way, I managed to temporarily solve the problem here by both purchasing a balanced jack to jack cable and by buying another 9v battery for a DI box.

Thanks gain :headbang:

Benny
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