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Noise between my Lexicon MPX G-2 and my MP-1 with effects before the preamp

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El Chiguete:
Hear this quick video I made. https://www.youtube.com/watch?v=RxzcGasjfoc&feature=youtu.be

Now that I'm looking to finalize mi rack setup I want to takle this noise/hiss that I get when I run any effect before my preamp. Here is again the description I put in the youtube video:

"I connect my ADA MP-1 preamp by 4 cable method to my Lexicon MPX G-2 and if I connect my guitar direct to the input of the Lexicon (to have effects in front of the MP-1) I get this hiss/noise. Notice that if I turn off the effect (in this case a simple volume pedal) that goes infront of my preamp, bypass the hole unit or connect straight to the MP-1 (and still using the effects that go after the preamp) the NOISE GOES AWAY!

Is this a ground loop problem? or something else?

BTW the signal that goes from the SEND of the Lexicon to the INPUT of the MP-1 is adjustable and it doesn't matter what level I put it at, the hiss/noise is still there!"

What do you guys think?

PS:
I have the amp at high volume and what the camera picks up seems to be louder... in person you don't hear it that much when you play, but you can hear it.

rnolan:
Hey El, a little perplexing, so when you unplug guit it goes ape shit with the hiss. At high gain a bit of mains hum is often there, but you get that when you plug in, and when you unplug, it should be relatively quiet. So somethings not quiet right. What's plugged into what BTW???
Ideally you'd be Guitar (maybe but no more: analogue wah/vol pedal (already stuffing your tone BTW, and please don't put anything digital before your MP1))  > MP1 MP1 out L/R to poweramp. Now you need to mix fx into the signal, to prevent AD/DA conversion crap on your pristine analogue signal, you need to mix in the lexicon in parallel and stereo. Any decent mixer with 2 fx send can do this but cheap way is the Art SplitMix (the same as what MikeB did (check posts)). It makes a big sonic difference and will help your gain structure. If you still have hiss after not putting Lexicon in front of MP1, needs more thought, but as I said what is your current patch ?
Cheers R

MarshallJMP:
Do you have a V1 or V2 MP-1?

El Chiguete:
Nolan: I have nothing plugged in before to my MP-1 except the Lexicon. I wouldnt use effects before it all the time just on special ocations that I would need to... actually even if I run like "4 cable method" if I dont have any effects turned ON on the chain before the SEND of the Lexicon it actually changes to true bypass and there is no AD/DA convertion.


Marshall: I have version 2.01... that is V2 yes?

I sended a messege to McLeanAB for him to share his thought on how he connected his MP-1 and other preamps to his Lexicon MPX G-2.

rnolan:
Hey El, the way I suggest is the best IMHO and I wouldn't  use it in front of MP1 (I'd mix it in full wet in parallel). But to to track down your noise issue, can you just try basic Guit > Mp1 > poweramp > cabs (any noise ?), and add things one at a time checking. (here's a thought bubble (ready to be popped LOL), I'm suspecting the Lexicon can run at either line level or inst level ? and knowing lexicon they probably allow that at both input and output ? i.e. selectable) so careful with your gain structure.
MJMP means V1 and V2 hardware. e.g. If it has the inst/line switch on top it's V1 MP1 hardware. V2 models don't have the switch and (IIRC) the rear input is inst level.
Cheers R

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