Question about Soundcraft Gigrac 600 Powered Mixer

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Why is there no output from one of the speaker jacks?

One of the speaker amps is apparently not working

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You seem to have answered your own question but it is possible that the speaker jack is defective

Posted on Jan 22, 2013

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How do you connect a peavey 6505+ amp to a marshall 1960a cabinet?


On the back of your 6505 there are two jacks that are labeled speaker outputs. For mono function, use either one of those outputs and run a SPEAKER cable from your amp to one of the input jacks of your 1960a cabinet. I assume it is a 4X12 cabinet. Either input will work. Make sure you match the ohm selector on your 6505 (right next to the output jack, 4/8/or 16 ohms) to the ohm rating on your 1960 cabinet. It is likely labeled on the plate that houses the input jacks. You should be good to go. NOTE: Never turn your amp on unless it is hooked up to a speaker cabinet and never use instrument cable to hook your amp to your speaker cabinet. Bad for a nice tube amp like yours.
Rock on and hope it helps.

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1 Answer

My frontman 15r has power but no sound


Check to make sure the problem is not with the headphone jack or the external speaker jack as these are in the circuit between the power amp chip and the built in speaker.

You can also trace through the circuit with a music source on the amp input and with simple headphones check the signal path through the circuit until the music disappears. To do this, take a headphone and set it up with 2 test leads on the ends- attach one to ground.

Now your TL072 op amps have 2 outputs, pin1 and pin 7. The inputs for pin 1 are pins 2 and 3, and the inputs for the amp section outputing on pin 7 are pin 5 and pin 6. If you get sound at pin 1 or pin 7, you move forward to the next TL072. Check for output. Then move to the power amp chip on the heat sink. Pin 1 should be the output and will be wired to the headphone jack first. The external speaker jack second and the built in speaker third. The input for that power amplifier chip is pin 7 or pin 8 depending how it is wired.

If the amp chip is blown, make sure to put an adequate amount of thermal grease on the back side of the IC in contact with the heat sink so it can operate as cool as possible.

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1 Answer

Hooking up the speaker to an amp, using the rca line out of the amp i have no volume control from the amp knobs, can i hook the speakers up to the amp from the speaker out ?


You should NOT under any circumstances connect an audio input lead to a speaker output jack!
The RCA jacks you are trying to take output from ore "pre fader" which would be solid "line level" and not controlled by volume controls. Tap off the INPUT to the amp... you should be using balanced lines for the interconnects. RCA jacks are unbalanced lines. You can drive several inputs from a line level output of a mixer for example using a splitter cable.

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I have a budda superdrive 30 II amp and have a setting question. I made a 2-12 cabinet to hook to this amp. Each speaker is 4 ohms. They are wired to their own output jack. My amp has 2 outputs for...


You best rewire the cabinet to put the two speakers in series. Wire one speaker plus to minus of the other and bring the other lead, one from each speaker to your jack on the cabinet. The amp output impedance is what is set on the switch... for two 8 ohm speakers you would use both jacks to the two speakers BUT ssince you have 4 ohm speakers the ONLY option is for two in series and set the switch to 8 ohms. The amp is ONLY 30 Watts so don't expect too much sound output... You should get a nice CLEAN sound at a reasonable level. If you drive the amp too hard it will clip and you will get garbage.

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I Have a Peavey XR 600B mixer. There are only 2 inputs in the rear for speakers. I want to add more speakers to be used as monitors or just have extra speakers. How can this be done? I only have...


First off it's outputs to your speakers. If you had an extra set of powered or amplified speakers you could "Y" cable your speaker outputs. Your passive speakers won't work without an amp. You really need powered speakers or an amp for your extra speakers. (if you had powered/amp'd speakers you could run them off one of you "aux" out for monitors. Do not daisy chain your speakers connecting twi together, you'll change the resistance/ohms and damage your speakers. Trust me, I do this for a living.

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Greetings. My MG 250 DFX Marshall 100W amp behaves strangely... I had some problems with it lately. I've been using it for a few years in my flat, so it has not been used extensively in terms of power...


I believe the design of this results in what you are seeing... Check each speaker INDIVIDUALLY plugged into the MAIN output as plugging into the second jack shifts the tap of the output transformer to the 4 ohm tap which results in a 6 Db drop but now you have two speakers... the apparent level change will be almost unnoticeable.. Do comparision of the speakers individually using the MAIN jack. This is just the characteristics of the beast...

Jan 11, 2011 | Marshall Amplification Marshall MG250DFX...

4 Answers

Marshall MG50 DFX amp line out/headphones not working


Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.

Mar 07, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

Is it possible to obtain a replacement pre-amp board for a yamaha hs6 organ? there is a signal coming from the board which can passed through an external guitar amp, via the left or right speaker jacks, to...


Check all the capacitors one at a time for leakage.You might also have a transistor in the preamp stage which is starting to go bad. Whatever you do though don't use the speaker output jacks of the organ as line outs into the input jack of the guitar amp. In a properly working organ you could destroy the output transformer and the input stage of your amp because most speaker outs are A.C. voltage to drive the speakers not low level D.C. which is what your amp is used to. Let me know how you make out.

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2 Answers

Marshall MG100HDFX 100-Watt Amplifier Head. The head phone jack works but speaker output is dead. Hooked it to speakers with another amp input and after word it stopped working. Can't see any overheated...


You'll have to take it in to get it repaired. From what you described it sounds like you blew the output stage out. You can't run from your speaker output jack into the input jack of another amp. You should go out of the recording out, line out, effects out or in the least case your headphone out. What happens usually is your output transformer short circuits due to a mismatch of impedances. It sounds like you still have a transformer though so you might have gotten lucky. You will need to take it in though. Sorry.

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1 Answer

No output


There are some possibilities. One, your speaker may be blown or disconnected. Make sure the wiring is still connected to the speaker and if you have one, try measuring the resistance(impedance) of the speaker with a volt ohm meter.Do this unplugged from current and disconnect one of the wires from the speaker or you will get a reading from the output stage. Two if there is a heaphone or line out jack it may have become faulty. If you have sound with the headphones plugged in your amp is still producing sound. Some jacks are designed to interrupt the signal to the speakers allowing you to practice without bothering anyone. If your amp has that feature and you still have sound with the headphones and your speaker tests OK then your problem is the jack. Hope this helps.

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