Question about Numark Industries Numark X6 Two Channel Professional Digital 10" Mixer
Channel 1 red input is weak and staticky, also headphones are poping with power on/off even though no inputs were connected. A/C adapter makes a humming when power is turned on to the mixer.
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Posted on Jan 02, 2017
SOURCE: HISS from Numark DM1200 mixer.
All interconnected equipment MUST be powered from the same receptacle or source. The XLR to the speakers should NOT have ground lift. The power for the mixer should come from where the speakers are and be routed alongside the XLR cables. All the other connected items should also be powered by the same source. The ground bounce within a building cannot only cause noise, but can rupture the input circuits of equipment. As an electrical engineer I don't know why manuals supplied with the equipment doesn't go into this more. The professionals at the big venues all know this as they have had to pay to get equipment repaired.
Now to get down to "hiss" once you get the other stuff straightened out, there are two things to know at the start: The first is that due to the statistical nature in electronics "noise and hiss" are among the laws of physics that we can't completely get around. The level of the hiss should NOT be objectionable however. The second thing is that proper level setup is important to minimize the effects of noise and hiss. You should be sending the levels to the powered speakers at near full line level into the line inouts, never mic inputs that some have. Using excess gain at the speakers will amplify any noise pickup on your audio lines. Next, at the mixer, try to keep all the level controls around 10 to 2 0'clock for rotaries and 70% for faders. Excess gain at certain stages will cause hiss to be objectionable.
Posted on Mar 19, 2011
What is plugged into your Numark mixer when this happens? Try disconnecting ALL audio inputs to your mixer, turn mixer volumes to zero and see if the hum is still present. Adjust the volume and check if the hum you mentioned returns. If it is still heard, try new cables between the mixer and amp...if not then start reconnecting inputs until the hum is heard again. It's a process of elimination but not that difficult to find the source of your problem.
Posted on Nov 01, 2012
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