Question about Yamaha Mg12-4fx 12-Channel Mixer with Effects System

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Yamaha mg12-4x mixer--training

We just recently upgraded our mixer and just about the same time we lost our person that was setting it up for our church. At this point in time we are a little lost because, we neglected to cross train someone else. Is there a "crash course" that we could subscribe to or manual that would be easier than the manual that came with our unit to train new people from? Any help or starting point would be very appreciated. We normally have one lead singer, 3 other singers, one guitar, one base guitar, one electric drums. We are presently using 2 Bose towers and 2 bases.
Thank you
Lee Roseno
Quail Lake Community Church

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Channels 1 and 2 on a Yamaha MG166cx-USB mixer seem to be burned out. They aren't working. Other channels are fine. Any idea what the issue could be?

Get the schematics. ALSO, MANY TIMES IT IS AN ISSUE OF THE INSERT JACKS BECOMING DIRTY ! Spray some cleaner and plug/unplug a plug (sic) several times. That has saved me many times. Luck !

Feb 20, 2014 | Yamaha MG166CX-USB Mixer w/ Cable and...

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Can I connect only one speaker to a yamaha emx 312 sc power mixer?

First it is certain that you would not want to plug both outputs of the stereo power amp into one speaker combining both channels into the same speaker. (see image from manual below - also link to manual)

Next I would be very concerned about only using the one side of the main amp out as it could cause an unbalanced load, or you could be driving the load into dead air connection and any of these conditions are destined to cause premature failure of the power amp.

Taking a quick scan of the manual for this unit, it appears what is pretty common to most powered mixers, hook up two matched speakers/loads to each chanel of the output.

Your best bet is to shed those monster cabs, there really is no need for them especially with this sized powered mixer, and get yourself a nice pair of full range cabs like EV1202;s, EV SX300's, or some nice 2 or 3 way 15" JBL's/

Just my opinon.

Link to Yamaha EMX 312 Owner's Manual:

Yamaha EMX Series Owners Manual


Dec 06, 2013 | Yamaha Music

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Hen the controller is switched off the monitor comes back VOX

Depending on what other settings are chosen- this at times can be normal. You may be simply switching from the output of the mixer board to the sound input source, and if gain is up and mixer level is up, you will hear it. If it is outputing to the host and it should not be; check stored settings and Scene memory.

Apr 06, 2012 | Yamaha 01V96 VCM Digital Mixer

1 Answer

My Yamaha MG102C mixer worked fine until recently. Now most of the time , the volume drops away and then comes back every 20 seconds or so..any idea what this could be?

I would suspect the power supply regulator MAY be thermally shutting down and then cools and restarts.

The 20 second interval almost has to be thermal to get the delay.

Sep 19, 2010 | Yamaha Mg102c Stereo Mixer

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Yamaha Mg12-4fx 12-Channel Mixer

ok look here on page 21 & 22 of 32

section #5," ST output"
the "st out" will go to the amp you have for the mixed sounds

section #1, "line or mic input"
this is the input for the guitar or a mic , but only one(mic or line ) per input # at a time

Mar 31, 2009 | Yamaha Mg12-4fx 12-Channel Mixer with...

2 Answers

Channel mixer problem- No channel B output.

Probably time for an upgrade to a newer channel mixer. Your mixer is probably not worth fixing, but you could continue to use the mixer side for a while until you decide to upgrade that. If you happen to know an electronics tech, it could be a little project to check the power amp insert jack on channel B, but it wouldn't be worth spending good money after bad when you could put it towards more solid gear.

Good luck.

The dude.

Aug 07, 2008 | Peavey 32fx USB 32 Channel Mixer

1 Answer

Firmware Upgrade

Where did you get the firmware upgrade? Please provide link.

Mar 05, 2008 | Yamaha RX-V2700 Receiver

1 Answer

Hooking up a turn table

You should get a turntable adapter. They adjust the impedance so they can be plugged into a typical auxiliary input. Or you get a DJ mixer; most can do the same thing. I have an old Realistic Stereo mixer that does the job, and it has two phono inputs, as well as a Tape input. Very handy for this purpose. Go to Radio Shack if your budget is tight, but a pro DJ mixer would probably be the best solution for an audiophile.

Oct 24, 2006 | Yamaha HTR-5830 Receiver

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