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Grounding issue with laptop power cable/guitar

Member for

9 years 8 months

I have a macbook pro laptop and my audio interface is the Apogee Duet 2. Whenever I plug my guitars into the apogee interface I've got a hum going on. I can get rid of the hum if I take out my laptops power cable however I then have an issue of the laptop overloading frequently (not running at full capacity without power cable) and running out of battery without the power cable.

Any advice on how best set this up to keep my power cable in my laptop while recording guitars?

Many thanks


Apogee duet 2 hum / grounding issue?

Member for

9 years 8 months
Hi I have an apogee duet 2 , using garageband on macbook. Whenever I run my guitar through xlr or instrument input I have a very loud hum that does not go away unless i put my hand on bare foot on the apogee. Its becoming annoying playing guitar with my foot on the thing any advice on how to sort this out?


Watkins Copicat grounding

Member for

8 years
Hello everyone,

I just bought a Copicat ic300 and it has a 2 core mains wire which means it's not grounded. I've had a look around the web but can't find instruction on how to ground it. Can anyone help? is it just as simple as replacing the 2 core to 3 core and connecting the ground to the case? or is there more to it (ie, inputs need grounding)?

Thanks in advance.

Viceroy is a cat

Deciding what way to troubleshoot background hiss or grounding problem...

Member for

8 years 7 months
So, I have been working over the past couple of years intermittently trying to record both my guitar, and lately my voice, using my laptop and audio interfaces. I have always run into the same problem: background hiss and white noise. I have done this using Windows (XP, Vista, and now Windows 7 64-bit), as well as Cakewalk Music Creator and Reaper.

Direct Injection box Grounding Theory

Member for

9 years 2 months
In a properly wired DI box, the shield of the unbalanced connection is wired to pin 1 of the XLR. Since the shield is signal-bearing, this would induce a voltage over pin 1 of the XLR line. A ground lift switch breaks this connection, but why would you want it to begin with? Wouldn't you always want your ground to be at 0V, and not carry a voltage during normal operation?

Grounding Problems w/Rack

Member for

11 years 7 months
I have slowly over the yrs ended w/a bunch of cool FX but now when I turn them on w/a Furman PC I get a loud thump. Some of the FX have 3 prong and some 2prong.Before I start ripping it all down any advice.Could I have a bad cap to ground ect.How does a studio keep it OK. Here a list,1)furman 2)Soho 4 tube preamp,3)ART Pitch tranposer/multFX. 4) Roland SRV 2000 Reverb 5)Roland SDE1000 DDL 6)Yamaha HD1500DDL..

Electrical Grounding Issues?

Member for

12 years 7 months
The amp I just got secondhand off my friend (actually third hand because he got it from his friend...) has a bit of a problem in the grounding dept. One of the first things I noticed was that the plug didn't have a ground on it. It did, but it was torn off/broken.

Is this a problem? I have it plugged into a power strip if that makes any difference. If it is a problem, how urgent is it? Should I even play it, or could that cause damage?

Confirmation - Balance, Grounding, DI Box

Member for

13 years 9 months
tl;dr: DI fixes ground loop?

I've had the Church on my back (one guy anyway) about the loop for deaf people. Now while I'll not go into the politics and just say I'd prefer people to use their hearing aids to amplify the ambient sound, not tune into a dodgy loop...
ANYWAY I digress.

Mixer uses effect send to feed loop amplifier at far end of building, people are complaining about all sorts, squealing, buzzing, too quiet etc.

Grounding my patchbay

Member for

21 years
i just picked up a neutrik NYS-SPP-L1 stereo patch panel. it came with a bag of grounding clips and i dont know what channels to apply them to.i have a neutrik NYS-SPP-L patchbay as well and that one didnt come with grounders. can anyone explain to me the difference in the two? can someone explain as well to me which types of electronics would need to be grounded and when these grounders apply to the individual channels?

Thanks in advance