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Post subject: Other phones out to Frontman 65R PWR IN?
Posted: Fri Oct 15, 2010 3:08 pm
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Wanted to ask rather than risk experimenting:

I have a cute little Roland Boss MG-10 that makes some amazing distortions. I'd like to use if as a front end and run it to my Frontman 65R. The Roland has a headphone jack. Can I patch that to the PWR IN of my Frontman's effects loop safely? If so, what do I lose and/or retain of my Frontman's controls and power? I'm assuming here that I can't run the headphone out to the Frontman's instrument input safely; If I'm wrong, please let me know.


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Post subject: Re: Other phones out to Frontman 65R PWR IN?
Posted: Fri Oct 15, 2010 3:49 pm
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DynaSoar wrote:
Wanted to ask rather than risk experimenting:

I have a cute little Roland Boss MG-10 that makes some amazing distortions. I'd like to use if as a front end and run it to my Frontman 65R. The Roland has a headphone jack. Can I patch that to the PWR IN of my Frontman's effects loop safely? If so, what do I lose and/or retain of my Frontman's controls and power? I'm assuming here that I can't run the headphone out to the Frontman's instrument input safely; If I'm wrong, please let me know.



ummm, I think there's some wires crossed here.
You don't put a headphone plug into an instrument input jack.
As for connecting the MG-10 to the Frontman 65R, I am not familiar with that Roland amp. You might be able to, I certainly don't know.
IF you want to use a headphone on the 65R you might be able use a power tap like weber headphone tap https://taweber.powweb.com/weber/hpa50.htm.
But it looks like weber's headphone tap may not like your amp's watts.


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Post subject: Re: Other phones out to Frontman 65R PWR IN?
Posted: Mon Nov 22, 2010 5:51 am
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Twinhit wrote:
DynaSoar wrote:
Wanted to ask rather than risk experimenting:

I have a cute little Roland Boss MG-10 that makes some amazing distortions. I'd like to use if as a front end and run it to my Frontman 65R. The Roland has a headphone jack. Can I patch that to the PWR IN of my Frontman's effects loop safely? If so, what do I lose and/or retain of my Frontman's controls and power? I'm assuming here that I can't run the headphone out to the Frontman's instrument input safely; If I'm wrong, please let me know.



ummm, I think there's some wires crossed here.
You don't put a headphone plug into an instrument input jack.
As for connecting the MG-10 to the Frontman 65R, I am not familiar with that Roland amp. You might be able to, I certainly don't know.
IF you want to use a headphone on the 65R you might be able use a power tap like weber headphone tap https://taweber.powweb.com/weber/hpa50.htm.
But it looks like weber's headphone tap may not like your amp's watts.


Perhaps I wasn't clear. I want to use the Roland much like an effects pedal. I want to hook its output to the input of the Frontman but am not sure what input levels the Frontman can tolerate. I can run a cord from the headphone output on the Roland to the input of the Frontman, either the instrument input or the PWR IN of the effects loop. I'm asking whether this is possible to do without incurring damage to one or both.


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Posted: Tue Nov 23, 2010 4:23 pm
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Hi DynaSoar,

The problem, is that the headphone out is a stereo connection, and your input jack on the amp is a mono connection. Look at the plug for the headphones, note the tip and two sections of the sleeve, each separated by a small space of insulation. While the instrument cable has a tip and only one sleeve section. If you plug the instrument cable into a headphone jack, half of the output of the headphone jack will be shorted to ground, it might work, but would sound horrible and could possibly do some damage. Likewise, if you plug headphones into a "preamp out" on an amp, you will only hear one side of the headphones. :)

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Posted: Tue Nov 23, 2010 7:47 pm
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shimmilou wrote:
Hi DynaSoar,

The problem, is that the headphone out is a stereo connection, and your input jack on the amp is a mono connection. Look at the plug for the headphones, note the tip and two sections of the sleeve, each separated by a small space of insulation. While the instrument cable has a tip and only one sleeve section. If you plug the instrument cable into a headphone jack, half of the output of the headphone jack will be shorted to ground, it might work, but would sound horrible and could possibly do some damage. Likewise, if you plug headphones into a "preamp out" on an amp, you will only hear one side of the headphones. :)


No, that's not the problem. The problem is the line levels of headphone outputs vs instrument or power-in inputs. It has to do with voltages and such. That's the problem. I know because I asked it. I'm hoping someone familiar with the various powers involved can answer. Answers regarding issues which are not in question, such as plugging headphones into anything, are best directed where someone is asking about such things. Answers which are just plain wrong -- a stereo 1/4" plug in a mono jack will make contact with ground and one of the contacts will be connected to one signal with the other line of the stereo plug contacting nothing, but will NOT "short" anything to ground -- should be left out entirely. The stereo headphone output on any amp may send signal to both earphones but only because it's wired to. The signal its sending is from a guitar amplifier which will, except in a very few instances which will be well known to the owner, be mono, with the two signal channels of the stereo headphone output being wired to one and the same source, the mono amplifier output.


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Posted: Tue Nov 23, 2010 8:21 pm
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Maybe this will help. 8)

http://www.sustainiac.com/guitar%20controls.pdf

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Posted: Tue Nov 23, 2010 11:21 pm
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DynaSoar wrote:
No, that's not the problem. The problem is the line levels of headphone outputs vs instrument or power-in inputs. It has to do with voltages and such. That's the problem. I know because I asked it. I'm hoping someone familiar with the various powers involved can answer. Answers regarding issues which are not in question, such as plugging headphones into anything, are best directed where someone is asking about such things. Answers which are just plain wrong -- a stereo 1/4" plug in a mono jack will make contact with ground and one of the contacts will be connected to one signal with the other line of the stereo plug contacting nothing, but will NOT "short" anything to ground -- should be left out entirely. The stereo headphone output on any amp may send signal to both earphones but only because it's wired to. The signal its sending is from a guitar amplifier which will, except in a very few instances which will be well known to the owner, be mono, with the two signal channels of the stereo headphone output being wired to one and the same source, the mono amplifier output.


For someone who is asking for help, you certainly are being rude to the people who are trying to help you. Shimmilou and twinhit probably know more about amps than you ever will.

That said, if you can figure out how to connect the Boss amp to the Frontman (And shimmilou is correct in his description of the problem of connecting a stereo output to a mono input. You did not read or understand it correctly), have at it. Let us know how it goes. :roll:

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Posted: Tue Nov 23, 2010 11:38 pm
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bluesky636 wrote:
For someone who is asking for help, you certainly are being rude to the people who are trying to help you.


:roll:

It's like some near-drowning victim telling the lifeguard who braved a 500-meter swim through shark-infested waters while fighting a severe riptide undertow then spending ninety nonstop minutes sucessfully administering CPR that his savior needs a breath mint.

Very low-budget!

:mrgreen:

Arjay

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Posted: Wed Nov 24, 2010 9:18 am
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Retroverbial wrote:
bluesky636 wrote:
For someone who is asking for help, you certainly are being rude to the people who are trying to help you.


:roll:

It's like some near-drowning victim telling the lifeguard who braved a 500-meter swim through shark-infested waters while fighting a severe riptide undertow then spending ninety nonstop minutes sucessfully administering CPR that his savior needs a breath mint.

Very low-budget!

:mrgreen:

Arjay


Yep.



Mr. OP: I looked up the owner's manual for your "amp". Unless your "amp's" headphone output has some circuitry to reduce the output level to make it compatible with the average headphone, you would be plugging a very high level, 4 ohm source into an input expecting a low level, high impedance source. In other words, don't waste your time. However, if you do choose to experiement, please let us know the results.

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Post subject:
Posted: Wed Nov 24, 2010 4:09 pm
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bluesky636 wrote:
Retroverbial wrote:
bluesky636 wrote:
For someone who is asking for help, you certainly are being rude to the people who are trying to help you.


:roll:

It's like some near-drowning victim telling the lifeguard who braved a 500-meter swim through shark-infested waters while fighting a severe riptide undertow then spending ninety nonstop minutes sucessfully administering CPR that his savior needs a breath mint.

Very low-budget!

:mrgreen:

Arjay


Yep.



Mr. OP: I looked up the owner's manual for your "amp". Unless your "amp's" headphone output has some circuitry to reduce the output level to make it compatible with the average headphone, you would be plugging a very high level, 4 ohm source into an input expecting a low level, high impedance source. In other words, don't waste your time. However, if you do choose to experiment, please let us know the results.

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Bill

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