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Live Wire Solutions HA04 4 Channel Headphone Amplifier. Use it for inner ear out of headphone jack on PA. Works on some PA's and not others. Not sure why. anyone have thoughts as to why ?

Use it for inner ear out of headphone jack on PA. Works on some PA's and not others. Not sure why. anyone have thoughts as to why ?

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How to play with headphones


If you have a preamp output jack or a headphones jack on the back- those will work. They should interupt the speaker if you are wanting it for practice purposes.

if you do not have those, and want to add one, tap at the control grid of the Phase inverter ECC83/12AX7A which should be common grid to the final preamp tube, which should also be an ECC83/12AX7A and locate the coupling capacitor so you can tap ahead of it with a .1 microfarad 600 WVDC capacitor or one that matches the factory capacitor in series to the new jack, with shielded audio wire/coax to the new jack location, at the tip and the coaxial jacket should go to chassis ground at both ends. The grid is either pin2 or pin7 depending which way they chose to wire it. I do not have an Orange Amp schematic in front of me.

If you want to risk noise at that location, make it interuptable so when the headphones are removed, the circuit completes to the N/C contact of the headphone jack (which opens/opened when headphone plug is inserted.) back to the grid terminal. with that terminal connected by shielded wire back to the grid.

Instead of adding a capacitor, you can use the factory capacitor, just mount a terminal strip next to the phase inverter and move the capacitor to that new terminal tab and the wire to lead to the tip together on that ear, and the return wire from the headphone jack goes to the now vacated tube pin terminal. .

Look to see if on of the filament/heater pins is grounded to chassis- if so, just ground the sleeve contact of the jack. If it is not, determine which pin is closest to chassis ground potential and run the sleeve contact over to that pin. could be either 4, 5, or 9 Make sure to use an insulating headphone jack.

EL34 outputs should never be connected to a headphone.

Feb 06, 2012 | Orange Amps Orange RK50TCMKII212...

1 Answer

Soil appears to workeaker cno sound output from speaker or headphone output


• Open the unit, and check regulators in the power supply section.

• Could also be from the op amp IC , and coupling capacitors.

Sep 17, 2011 | Behringer K3000fx 300w 4-channel PA...

1 Answer

I bought a second hand Fishman LoudBox Performer. The problem is that the Aux-in for the headphone doesn't work. So sick... What can I do? tnx


I don't understand your question. The "Aux in" is just that an input that goes to the power amp. Please note that the Fishman Loudbox does NOT have a headphone jack so don't be disappointed as there plain isn't a headphone jack on this unit. I would recommend that you get a small headphone amplifier for the purpose... or even go to a thrift store and get an old stereo system that has a headphone jack and use that.

Aug 01, 2011 | Fishman Loudbox Performer Amp Acoustic

1 Answer

Sound is only coming out of the left headphone when I play


Is this the same on all channels?

Check your 3.5 -> 1/4 adapter is stereo (2 black bands on the connector) and check you havent got it set to mono.

Try with different headphones too.

Hope that helps!

Jul 05, 2011 | Live Wire Solutions HA04 4 Channel...

1 Answer

My amp isn't producing any sound. It works when headphones are in but that's it. Please help


The headphones socket is on the preamp stage - it works so the problem must be after the pre-amp.
Do you get any sound at all from the speakers (hiss or perhaps a click) when you turn it on?
If yes it is an amplifier problem.
Here are some possible causes
  • A wire has come off the loudspeaker - easy to fix
  • Speaker protection fuse has blown - small glass fuse mounted on main amplifier chassis - replace with correct rated and type of fuse (note some of these are 'slow' blow type - important that you get the right one)
  • faulty component in the main amplifier stage - requires attention from qualified repairer
  • Loudspeaker burnt out - this can be tested by connecting another speaker across the terminals of the built in speaker.
  • The headphone jack socket automatically disconnects the loudspeaker when phones are plugged in - it could be that the contact in the headphone jack socket is bent and not re-making contact when the headphones are unplugged.

Feb 26, 2011 | Orange Crush 15r 15w Reverb Guitar...

1 Answer

My Mackie1604VLZ is always cutting out every so often while playing live, audio just quit but power still on ???on every chanels no audio comin out just little bit of tiny distorted sounds ,thats all you...


You can do a major amount of troubleshooting using tests from the many jacks on this unit.
I can walk you through a lot of those if you keep getting back to me with the results. First test: When the failure occurs does one or both sides of the headphones plugged in the headphone jack ALSO quit? Also does the level meter LED's reflect loss of signal? If these are still OK I want you to plug the headphones into the MAIN MIX MONO OUT jack. The headphone signal won't be very strong, but is it OK and not distorted.

I hope you have remembered to use BALANCED (TRS) audio interconnect cables and not plain mono cables from your mixer to the amps. Use of mono cables shorts out one side of the balanced output driving amps in the mixer. Also the other send of these MUST connect to balanced amplifier inputs... NOTE some amps don't have this and you have to use a BALUN or a DI at that end.

Lastly, ALL inteconnected equipment MUST be powered from the same source or receptacle for system safety.

Feel free to contact me via email or whatever.

Feb 05, 2011 | Mackie 1604 Vlz3 16 Channel Mixer

1 Answer

Sp250 right outout seems to have broken and as a result there is no sound coming from the speakers on the keyboard or through the PA. If we use the left output through the PA - it works, Could you advise...


Check if headphone jack also has right channel dead... If headphones work on both channels, switch contacts on headphone jack MIGHT be the problem.

Jan 17, 2011 | Korg SP-250

1 Answer

I have a 1680S. How do I hook up my in-ear monitor? I plan to run two house speakers but no floor monitors. Thanks,


DO NOT connect your in-ear monitors to the power amp out using the MAIN/Mon speaker option as it would be goodbye hearing and fried ear buds..
Get a very small and in-expensive headphone amp and connect its input to the 1/4 inch Monitor output jack.

Dec 31, 2010 | Behringer PMP1680S Europower 10-Channel...

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

My behringer djx700 5 channel pro dj seems to have a feedback problem even when nothing's plugged in to it cant figure it out.


Hello,

It doesn't seem like a typical "feedback" problem, as feeback is produced by over modulation between the amplifier and the source - usually a pickup or microphone. It may be your cables to your amplifier are bad, or the actual line out jack(s) may have gone bad. If it is more of a humming sound rather than feedback, that is most likely your issue. If you have additional patch cables, switch out the existing ones, and see if that ends it. If not, it is possibly the jack(s).

You have a headphone jack on the Behringer, though you did not say if the problem arises through the headphones or an external amplifier. If you get the noise in the headphones, when no patch cords or a mic is attached, then the problem you should look at is your headphones or the headphone jack. You can narrow the problem down by using an external ampifier and see if you still have the "feedback" sound. if not, it's in the headphones or headphone jack.

Please try and provide more information for this question if we are unable to track the problem with these suggestions. As we do try very hard to center in on customer's problems, we do ask to provide as much information as possible, so that we can facilitate your resonse more effeciently.

Thank you for using FixYa.

Dec 31, 2009 | Behringer DJx700 5-Channel Pro DJ Mixer...

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