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Post subject: Mustang III - converting headphone out to real line out ?
Posted: Mon Apr 16, 2012 3:32 am
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The line-out signal from the Mustang III headphone jack sounds pretty good and for playing live it is a very good substitute for miking the amp. Our mixing guy is really happy about the results, but for me it´s not ideal: when plugging in a stereo jack, the internal speaker is muted, leaving me alone with only the line-out signal :cry:

My idea is to mod the headphone output, because I never use a headphone and I don´t want the internal speaker to be muted, when I plug in a jack to get a line-out signal for our FOH. I know, I will ruin my gurantee, but I think it´s worth it.

Has anyone a circuit drawing of this part of the amp, or a pic of the PCB or any idea how to do this ? Simply cutting a trace and that´s it ? Or more complicated ? Any help is welcome !


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Mon Apr 16, 2012 5:53 am
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take a split from fx loop (remembering to return the signal to fx in)


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Mon Apr 16, 2012 8:43 am
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That's not a bad idea, George.

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Mon Apr 16, 2012 11:32 am
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You don't have to do any of that. Just plug the effects send into a direct box. Remember to leave the speaker sim turned on. Sounds great through the house.

doc_holiday wrote:
The line-out signal from the Mustang III headphone jack sounds pretty good and for playing live it is a very good substitute for miking the amp. Our mixing guy is really happy about the results, but for me it´s not ideal: when plugging in a stereo jack, the internal speaker is muted, leaving me alone with only the line-out signal :cry:

My idea is to mod the headphone output, because I never use a headphone and I don´t want the internal speaker to be muted, when I plug in a jack to get a line-out signal for our FOH. I know, I will ruin my gurantee, but I think it´s worth it.

Has anyone a circuit drawing of this part of the amp, or a pic of the PCB or any idea how to do this ? Simply cutting a trace and that´s it ? Or more complicated ? Any help is welcome !

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Wed Apr 18, 2012 6:14 am
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I still had the signal through to the spkr even with cab sim off(defect?) and no return line to fx in(return).Nonetheless it should solve doc's problem.I'm using a MV.Cheers all


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Wed Apr 18, 2012 6:50 am
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The cab sim being turned off has nothing to do with the speaker being off. They are not related. So your amp is fine.

GT george wrote:
I still had the signal through to the spkr even with cab sim off(defect?) and no return line to fx in(return).Nonetheless it should solve doc's problem.I'm using a MV.Cheers all


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Wed Apr 18, 2012 11:04 am
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Hi Guys,

So, the Effect send can be used effectively to output audio for a house mix, recording, etc. You do not have to close the loop (i.e. use the Effect return jack). And in regard to the Cab sim off suggestion, I would suggest that a simple listening test will help you determine whether or not you want to use Cab sim.

Best Regards,

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Thu Apr 19, 2012 4:24 am
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@Alan, how do you attenuate it? Through my board (Yamaha) the signal's input is so hot and distorted I couldn't use it. And that was with the channel input pad turned all the way down. Through my friends board (Mackie) it can be turned down and sounds fine. Would using a DI box help? At the moment I'm just coming right from the amp to the board.


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Thu Apr 19, 2012 5:49 am
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I had no problems into my board(no-name and cheap),attenuated correctly.You may have to adjust your volume levels for certain patches(not master volume).


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Thu Apr 19, 2012 11:23 am
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Hi pathtaker,

I have tested here with a Fender Passport system. You should be able to take the Effects send directly and input it into your mixer. With a standard Gain/Trim on most consoles, the input level should be very usable. If you are using high gain Presets/Models, you may want to try turning down the channel volume. In any case, that will effectively as your output control without affecting the tone.

Best Regards,

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Thu Apr 19, 2012 12:37 pm
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pathtaker, please also check if there is a switch for MIC/LINE level for that channel. Some boards have a mic pre....

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Sun Apr 22, 2012 1:46 pm
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Cab sim should always be set to "ON" when going into the board.

Alan Willey - Fender wrote:
Hi Guys,

So, the Effect send can be used effectively to output audio for a house mix, recording, etc. You do not have to close the loop (i.e. use the Effect return jack). And in regard to the Cab sim off suggestion, I would suggest that a simple listening test will help you determine whether or not you want to use Cab sim.

Best Regards,


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Fri May 04, 2012 12:05 pm
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if this is the case, then could i run this effect send to another cabinet? perhaps another 12" speaker cab?
how do i hook up another cabinet?
USB, 1/8" to 1/4" speaker cable from headphone?


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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Fri May 04, 2012 2:05 pm
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Hi JOKER123,

The effect send/return on the Fender Mustang III-V amps is a line out, not a speaker out. It is not intended to be used as a speaker output. It is intended as a effect send first, and an optional line out for sending signal to a line-level input. Please let me know if i can assist further.

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Post subject: Re: Mustang III - converting headphone out to real line out
Posted: Fri May 04, 2012 5:36 pm
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Alan Willey - Fender wrote:
optional line out for sending signal to a line-level input.


So what if you did:

Effect send :arrow: External power amplifier :arrow: Speaker cab :?:

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