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I have a Yamaha emx 640 powered pa mixer that buzzes (not hum). with passive speakers connected. no inputs connected. and volume off. on master.

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How to get sound from a nady audio 4130 mpm 4 channel power mixer


First, plug it in. Next connect the speakers. Center all eq controls both master and channel. Turn off any reverb or effects. Turn the master volume 1/2 way up. Plug a sound source into channel 1 wiyj the channel volume all the way off. Turn on the amp. Slowly raise the channel volume until you heat output. If you get nothing, it's broken.

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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


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Dec 06, 2013 | Yamaha Music

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Speaker humms only. what causes that?


Incorrect connections or volume settings.

• In powering up, mixer first then amp

• In turning off , amp first then mixer


If hum still persist, without the mixer connected

then speaker amp may need servicing.

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I dont know how to connect my gem sound trf152 speakers


Looks like it takes regular home theatre speaker wire. If this is a powered speaker (like a JBL eon g2), then all you need is a passive mixer, and connect the speakers to the mixer. If this is not a powered (amplified) speaker, then you will need an amplifier to boost the sound source and drive the speakers, so you would connect the mixer to the amplifier, then the amp outs to the speakers.

Apr 14, 2012 | Gem Sound TRF152 15 Pro DJ PA Speaker

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I have a Eupoport EPA 900 system. Recently I started getting a consistent, low pitch and fairly loud hum out of both speakers. The hum adjusts with the volume, and I have tested it with various working...


Is the hum there with NO input cables connected? If not, you have bad cabling. Make sure you use only XLR to XLR mic cables and not the junky ones with a 1/4 inch plug that are for Karaoke machines. These devices usually use switching power supplies and do not have the power supply originating hum of older equipment. If the volume control adjusts the hum, then the hum originates previous to the control which is either in the preamps or the external inputs.

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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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Aux1 and 2 are not working...what is the fix on the emx5016cf yamaha board


You are NOT trying to drive speakers from the aux outputs are you? These are LINE outputs that should be using TRS balanced lines to either powered speakers or amplifiers. Often these are used for monitors. The monitoors MUST be powered versions or use external amplifier if the speakers are passive..

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1 Answer

The speaker connected to my Yamaha EMX 312 SC is not bringing out any sound when we use the microphones but the displays on the power mix shows there is activity.


Assuming that you have checked the speaker leads for broken connections and that you know the speakers themselves work okay (test with a different amp) and that you can hear sound on the headphone socket
  1. Check that you actually have the power amp switch in the right position for the outputs (monitor jacks or main neutrik/speakon sockets) that you are using (see page 25 of the manual)
  2. That your speakers are connected to the speaker outlets on the rear panel and not the 'main outputs' on the front panel, which are for use with a separate power amplifier
  3. Check the mute button is not in
  4. You have turned both the master volume controls up.
If none of the above solves the problem it is likely that the overload protection fuses on the amplifier output stage have blown and need replacing - take to a repairer
You can find the user's manual here
http://www2.yamaha.co.jp/manual/pdf/pa/english/mixers/emx512sc_en_om_d0.pdf



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1 Answer

Will a Behringer UB2442fx-PRO run 2 main PA speakers plus two passive stage monitors without blowing up?


ALL the speakers will either have to be POWERED or have external amplifiers. The mixer has NO power amps capable of driving speakers. When connecting, make sure that the mixer is powered by the same receptacle as the speakers or amps. Used balanced line for interconnection.

Jan 24, 2011 | Behringer Music

1 Answer

Bought a powered monitor as it said to do in the owner's manual, even though I thought it was weird as you usually use a passive monitor with a power amp. Purchased Kustom 10" powered monitor, hooked...


You haven't mentioned what model and manufacturer the mixer is. I will have to guess and say that the monitor out on the board isn't providing signal to the powered monitor or the monitor out on your board is powered and is now damaged by plugging a powered monitor into it. Carefully reread your manual and determine if the monitor out on your mixer is powered or line level. Reread also and make sure that the signal you are monitoring is assigned to monitor out, levelled correctly etc. If you find that the monitor out is passive (line level) try hooking it up to an external power amp and speaker. A guitar amp will do for testing purposes. Start with a low input volume on the amp. Also make sure that if it is passive to use a shielded cable from monitor out to input. If your board has powered monitor outs you can use a speaker cable from monitor out to speaker input (non powered monitor speaker).

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