R/E/P > Klaus Heyne's Mic Lab

XLR shell connections to ground in a microphone cable

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Kai:
Donít underestimate wood.

I do use wooden rack rails for ages and never any screw came loose.
Even on the deep and heavy 1U Lexicon PCM 70, and Iím lazy and do use two screws only even for this one.

You just have to use the right sized screws: 5 x 30 mm SPAX half-round head, with plastic washer underneath.
The wood itself is nothing special, simple spruce, 20 x 50 mm, predrilled 2 mm holes at the mounting positions to avoid splitting.

Try to pull out a screw like this by human force, you will find thatĎs not possible.
A rack device uses four...

Back support can be done the same way with units that need it.



To get rid of hum loops you have to keep the loop area as small as possible.
This means laying all lines, audio and power (!) in one big strand.
When using quality properly shielded cables, no stray hum goes from power to audio lines in my experience, even with my countryís  230 V mains voltage.
I do use double shielded multicores with heavy gauge shield.

Opposed to that microphone cables should be kept distant from power lines, specially from the high current ones for stage lighting!

klaus:
Kai,
Your last sentence is not clear to me: as I mentioned, even Neumann does not separate audio ground from AC/chassis ground.
Please explain in simple words what you mean.

I also recommend to not stray too far from the original subject. Maybe rackmount design goes a bit too far into the woods for this forum's users.

Kai:

--- Quote from: klaus on May 24, 2021, 09:55:41 AM ---Kai,
Your last sentence is not clear to me: as I mentioned, even Neumann does not separate audio ground from AC/chassis ground.
Please explain in simple words what you mean.

I also recommend to not stray too far from the original subject. Maybe rackmount design goes a bit too far into the woods for this forum's users.

--- End quote ---
I edited it, hope itís clear right now.
I do not advocate separating grounds beyond what the device designer intended.
By no means I suggest to change internals of devices.

Hum loops and the like are a common problem in studios and closely connected to the topic I think, so hopefully I did not digress too far.

Wooden rack rails is my invention (no Pat. pending) and hereby I share it with the world :)

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