Share effects loop and amp with GPDI-IR outputs

Stage & Studio Valvulator GPDI/IR
1

Turns out the SB-6 was not a good solution. It massively sucks tone. I re-ordered a Cyclops to give that a try again.

Is there a diagram for connecting:

  • A Marshall
  • GPDI-IR
  • Powerstation PS100
  • Cylcops
  • Effects Loop

I’d like to share the effects loop, and the Marshall to also go our though the GPDI-IR outputs, and for the GPDI-IR to also go out through the Powerstation to my cabinet.

Is this possible?
Thanks.

2

Hi Dan, can you help me with this… I just received the Cyclops and am hoping you can tell me how to hook it properly.

BR

3

Hi @brian5150

https://forum.fryette.com/uploads/default/original/2X/2/2049ab12845ccdfcec447eb95691b46ddc5f4371.png

When using the GPDI/IR, your amp’s effects get routed through the GPDI/IR, and the GPDI/IR outputs are always on.

I think the problem you are having is that you want to take a line out from the GPDI/IR preamp and put that into the Power Station Line In?

Can you confirm exactly what you would like? Posting a drawing is better than words.

4

image
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5

I am currenlty wired like this without the cyclops. I get the high pitched squeal when I connect the red circled line and flip the GPDI-IR switch to “EXT AMP”. Thanks!

image
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6

Actually, that’s not quite true… I have a powerstation in there too… you have another schematic that has the powerstation… but it’s the same connection to the Marshall input that causes the squeal.

So I guess I’m just asking for a wiring diagram that adds the Cyclops to the other drawing.

7

This is how it’s setup right now.

image
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8

Hi Dan, do you have some ideas here? A connection diagram would be awesome, or just letting me know that this setup idea won’t work. THanks, Brian

9

Hi @brian5150 !

Sorry I missed this! I think using PS-2A/PS-100 FX loop into the GPDI/IR is totally fine. This will work.

10

Hi Dan, please read through the issues above… I could not get rid of a high pitched squal when using the GPDI-IR Ext Amp out and into my Marshall 1987x.

So, I bought a Cyclops to see if that would do it… but I’m not sure how to wire that in and maintain the “requirements” in the image I uploaded above.

If that’s not possible, please let me know and I’ll just return the Cyclops and rethink things.

Thanks

11

I think you have a ground loop; it can manifest in these ways. The Cyclops is transformer-isolated so it can indeed break ground loops. Its main role in life is to switch a Power Station between an amp and a preamp.

Check this video out for more info on ground loops:

It could also be this, but I doubt it in your case:

For ground loop debug:

  • Remove any FX pedals/processors in front of the amp and in FX loop – check for feedback / squeal
  • How are the units powered? Do they run from a single wall socket (with an extension plug)?
  • Probably the only way you are going to break the loop is by isolating the connection you circled in the red line (Share effects loop and amp with GPDI-IR outputs - #5 by brian5150 here). I don’t think the Cyclops is the right tool for you. You should get an audio isolator. There are many different products like this on the market. Let me know if you need a recommendation.
12

Yes, I would like a recommendation… I tried a Radial SB-6 (I think it was). It worked but the 1987x tone suffered. BR

13

The front pedals are run thorugh a Canvas 8 from a different wall jack. The GPDI-IR, Marshall and Powerstation are powered from a common power strip. FYI.

I’ll have to test the removal of the front and loop effects tonight.

14

Sometimes we find that using different power supplies for the pedals in the front end and the loop is better. But probably from the same power strip would be worth testing.

But yes, remove the FX loop and let me know