Cloudlifter issues

[pucho812]

This is an interesting case

Noisy phantom power.  it's a a cloud lifter by cloud in use with an A&H digital mixer and sm7B mic. I can bypass there cloud lifter with phantom on directly to the mic and it's fine. If I have the cloud lifter in between I need phantom to run it. With phantom on I get a buzz that is barely audible. It's in the noise floor but it is there.  The cloud lifter was swapped as was the mic and cabling to the panel and no change. The only thing left is the panel wiring to the mixer and the mixer.  What would be a good way to test and eliminate this. Seems to be isolated to the one room as the other room with the cloud lifter and newer mixer seems fine.  In the other room it's an identical setup just a new A&H vs the one that has been in service for a few years. Both Cloud lifters are new.

 

[hazel]

I asked Cloud about an issue years ago and got very fast reply.

One of the best customer service I've ever found

About your issue : did you tried to power your Cloudlifter from another mixer or other room?

 

[abbey road d enfer]

Do you have the same noise with another  phantom-powered mic?
Are all grounds commoned on the panel? Wjat happens when you connect the same combo of Cloudlifter and SM7 direct to the mixer (bypassing the wiring)?

 

[pucho812]

Swapped the cloud this afternoon buzz moved channels... the cloudlifter is a bump box for ribbon and dynamic mics. Basically a phantom powered device that is a Pre  mic Pre adding as much as 25dB on a mic signal.  Thought about bypassing the cl4(4 channel cloud lifter). But then phantom would be turned off and the buzz would be gone as it does seem phantom related. 

 

[abbey road d enfer]

Swapped the cloud this afternoon buzz moved channels... the cloudlifter is a bump box for ribbon and dynamic mics. Basically a phantom powered device that is a Pre  mic Pre adding as much as 25dB on a mic signal.  Thought about bypassing the cl4(4 channel cloud lifter). But then phantom would be turned off and the buzz would be gone as it does seem phantom related.

Again:: what happens if you connect a phantom-powered mic there?

 

[pucho812]

Again:: what happens if you connect a phantom-powered mic there?

nothing the cloud lifter does not pass phantom onto the mic connected.

 

[abbey road d enfer]

nothing the cloud lifter does not pass phantom onto the mic connected.

That's not my question. What happens if you connect a phantom powered mic instead of the Cloudlifter?

 

[pucho812]

That's not my question. What happens if you connect a phantom powered mic instead of the Cloudlifter?

about to check that out and see.

 

[mjrippe]

Is it possible that the Cloudlifter is pulling more current than your preamp can supply?  We used to have issues with them on a Neve module rack until we replaced the phantom supply.

 

[pucho812]

Is it possible that the Cloudlifter is pulling more current than your preamp can supply?  We used to have issues with them on a Neve module rack until we replaced the phantom supply.

hmmmm I doubt it, the other channels sound fine.

 

[abbey road d enfer]

hmmmm I doubt it, the other channels sound fine.

Do you mean this noise with the Cloudlifter appears only on one channel?

 

[pucho812]

Do you mean this noise with the Cloudlifter appears only on one channel?

yes. The cloud lifter we have here is a cl4, so it is a box with 4 channels of cloud lifting in it.

 

[abbey road d enfer]

yes. The cloud lifter we have here is a cl4, so it is a box with 4 channels of cloud lifting in it.

So only one channel of CL4 does hum?

 

[pucho812]

After much testing,  the issue has resolved.  Come to find that the snake has a fault.  Luckily it's not my wiring work, unluckily for me I have to deal with conduets and other bobs and bits to fix it. Running a new line and we should be good.  I bypassed the  mic panel and noise went away.

New line following the same path and no noise. I can only suspect that the wiring team had their heat guns to high causing a short or something.  new lines fixed the issue.