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Topic: Four Cord Hookup?? |
Jonathan Shacklock
From:
London, UK
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Posted 8 May 2007 12:14 pm |
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Has anyone connected a stereo volume pedal to a N112 amp using the 'three cord hookup' and fed the pedal's second output straight to another amp's front input? Would this provide an impedance buffer for both amps? Or would the signal from the second VP out be boosted by the N112's first gain stage and therefore be too hot for the second amp?
I'm in knots trying to work it out (before I buy another cable). |
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John Groover McDuffie
From:
LA California, USA
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Posted 8 May 2007 7:11 pm
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I assume by "stereo volume pedal" you mean a pedal with two output jacks wired in parallel, like the Goodrich 120 for example. Seems to me it would work fine that way, but I don't have any first hand experience with a Nv112.
An extra cable is sometimes nice to have around anyway. 8~)
**Watch out for ground (I believe you Brits call it "earth") loops. Connecting the system in this way will tie the electronic grounds of the two amps directly together, which may in some instances cause a ground hum. When I use a two amp set-up I often have to "lift" the mains ground connection on one of the amps. I believe the mains in the UK have a ground cannection like they do here. |
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Jonathan Shacklock
From:
London, UK
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Posted 8 May 2007 11:28 pm
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| Hi John, yes you guessed right, Goodrich 120. Thank you for the info on the ground loop, I hadn't considered that. I will spring for the extra cable and test this out. |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 9 May 2007 8:02 am
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There would be no impedance buffer unless the pedal was a powered (amplified) pedal, with two buffered outputs. Amps have isolation resistors on their inputs, but that's not the same as an amplified buffer circuit. I suppose the long and short of it is that the second amps input loading will affect the tone (somewhat) in the first amp, but probably not enough to worry about.
A good thing to remember is that any additional cabling will affect the sound somewhat, even when using some sort of a buffer. By using buffers, you can reduce the effects of the additional capacitance, resistance, and impedance, but nothing will eliminate them entirely.
Just try it...you don't have anything to lose!  |
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Jack Stoner
From:
Kansas City, MO
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Posted 9 May 2007 10:35 am
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If you use the 3 cord hookup, your volume pedal in is from a preamp stage in the NV112 and then your volume pedal output is to the input of the next stage in the preamp.
However, if you run the 2nd output of the volume pedal to another amp you are actually running a parallel output and input from the NV112. Doing that MAY cause volume and tone problems in the 2nd amp and MAY even cause unwanted interaction in both amps.
A very bad idea, my opinion, and I used to be an amp tech and would never even consider doing what you are suggesting. But, I've seen guys do a lot of "crazy" stuff that again being a tech, I wouldn't even remotely do. |
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