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Mackie dl1608 and Bose l1 humming

I am using a Mackie DL1608 into a Bose L1 Model II and getting a loud humming . What could cause this?

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  • 43 Answers

This sounds like a ground loop.
Make sure that everything in your signal chain (mixer and anything that plugs into the mixer, and the L1®) are all plugged into the same power source (power bar).
More tips here:
Ground Loop Bose L1 Encyclopedia FAQ Wiki

Posted on Mar 03, 2015

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Posted on Jan 02, 2017

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SOURCE: Loud hum when Bose Companion 3 Series II speakers are turned on.

I had the same problem for many months. I asked a sound & video professional and he suggested I move the subwoofer away from any power source. I had the subwoofer next to my UPS. Once separated and moved all wiring away from the power supply (about 12") the low bass hum was practically gone.

Posted on Nov 14, 2009

bronk50
  • 27725 Answers

SOURCE: get loud hum from both

try swapping the speakers around if the problem still persists either the speaker is faulty
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
be sure to wear an anti static earth strap before touching anything inside your computer
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the CPU central processing unit and your sound card dust causes static to build up in a computer causing it to overheat any many other problems
hope this helps

Posted on May 23, 2011

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1 Answer

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From the Bose instruction manual (wonderful what can be achieved when one reads ;) )...

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The Model II Power Stand Trim only affects the Model II Analog input (1/4" jack).



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Here are some notes:

L1 Model II Bose L1 Encyclopedia FAQ Wiki l1-model-2-trim-not-working-tonematch-l4qeg2fyniuwsgnfiobf0ph3-2-0.png

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See this article on the inputs on the Bose L1®.
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Bose l1


You directed this question at me, but unfortunately I'm unable to provide you with a "real" solution at this time. FixYa has informed me that by providing you with this "solution" your question will then be made visible to other experts; hopefully one of them will be able to provide you with a real solution.
You might also want to consider posting the question in a category other than "Calculators."
Thank you for using FixYa.

Dec 14, 2011 | Office Equipment & Supplies

2 Answers

Just bought a ProFX8 mixer to connect to my Bose L1 PA system, but as soon as I connect the outputs to the Bose inputs and raise the master fader there is a "ground hum" even without anything...


Make sure you are using BALANCED audio interconnect cables AND that the speakers and the mixer are powered from the SAME receptacle... Yes, this means running extension cords. It is a ground loop problem. You should be using XLR or TRS cables BALANCED cables from the mixer to the basss unit of the L1 system. The bass unit and the mixer MUST be powered from the same receptacle to avoid ground loops and hum.

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