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My old CR1604 mackie mixer is making a humming sound on every channel trough every output, I'm using unbalanced cables and running it trough a non humming berhinger powered mixer
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I doubt the issue will be the regulators if you have the correct voltage on them.
Check where the hum is coming from.
What frequency is the hum; 50/60HZ = mains hum = bad ground. 100/120HZ = power supply hum.
Affected by a control somewhere maybe.
This should be a fairly reasonable repair. The main problem is finding the source of the hum. Since it is effected by the sliders, the source is in the mic pre-amp sections. Since all channels are effected, I would suspect a power supply problem rather than a problem with the electronics. Please send a note to [email protected] asking her for contact information for me. I can help you out. These are decent mixers (I own a few) and should last for many years. Yours just needs a little TLC.
The problem is that card has only UNBALANCED inputs. You really need balanced or first run the mixer outputs through a DI backwards. Frankly, I would recommend NOT using a card within the PC as there is so much digital noise. Use either a USB or Firewire external convertor and for goodness sakes use balanced lines from teh Mackie... ALL interconnected equipment needs to be powered from the same receptacle or source. M Audio, Roland/Cakewalk and Presonus all make cards as do others.
This sounds like a ground loop. Make sure ALL (including the computer) interconnected devices are powered from the same receptacle. Make sure there are no lamp dimmers around as these can cause hum...
Try hooking your mixer up to your Mackies without the laptop. Does the hum go away? Try hooking your laptop output up to the Mackies without the mixer. Does the hum go away? Make sure that all your power cables run from the same outlet and have the ground or third pin intact on the plug. Also make sure that you are using shielded cables for any connection that carries an audio signal. This includes the cables going to your Mackies as they are powered amplified monitors. Make sure that the cables to your Mackies are balanced and haven't been altered to unbalanced. You will need to use unbalanced cables from your laptop unfortunately but try to find ones with a shield and three conductors ( right and left signals and a common or ground) that have a separate shield from the common. The shield should only be connected to common at the output of the device where the signal starts. A better explanation is at these links:http://www.epanorama.net/documents/groundloop/ also http://www.epanorama.net/documents/groundloop/cable_shielding.html
Without hearing the noise or seeing it on a scope, I can't say for sure, but this type of noise can come from a number of sources. If there is a high signal level on one bus, you could be getting some cross-talk from that channel onto the channel with the higher gain setting. Try to track this down a bit by experimentation. For example, do you hear this with NO connections at all, but with the gain turned up on one channel?
Please try a few things to narrow this down a bit and I'll try to provide you with some options.
If all other functions work for those channels, the most likely problem is the fader itself. These can fail and operate more like switches rather than faders. Without witnessing the behavior, I can not state that for sure. While these mixers are not the hardest to work on, they are time consuming. The faders can be purchased from Mackie directly. If you need to have this repaired, any shop that repairs audio gear should be able to erpair this for you. Where are you located?
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