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Shadowfax59
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Mar 27, 2018
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Can anyone please explain to me the grounding scheme used in this amp? For example, is the amplifier box chassis tied to earth ground from the power supply that it gets from the 110 VAC power connector? If so, is that earth ground also tied to the 24 V return line? For input signals, is chassis ground tied to shield ground for the XLR and RCA inputs? Same question on the SE outputs, are the ground lines tied to the same earth/chassis ground?
Mar 27, 2018
Hi @Shadowfax59 . -within the power brick itself, the 24V +/- lines are floating from earth -within the chassis the 24V neg terminal, RCA-'s, XLR-3's GND, 3.5mm output sleeve, 1/4" output sleeve, XLR-4 output sleeve, and the metal chassis itself all have "connection" to circuit ground. Depending on the item, this "connection" is either a purposeful low impedance network or a short. The routing of these connections is carefully controlled. -most critically, the preamp treats the RCA inputs differentially right from the jack. So the effect of any ground noise current is reduced.
Mar 28, 2018
Shadowfax59
6
Mar 28, 2018
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Andrew, Thank you for the information. Sounds like you guys have designed the box the right way to allow users to avoid ground-loops (if we choose to). I am very happy to hear that the 24 V return is not tied to earth at the brick, but you allow us to choose where to bring in an earth connection depending on our system configuration. It is my observation that not enough people pay attention to the grounding scheme ... until they have a problem.
P.S. I am in the drop and looking forward to hearing this system.
Mar 28, 2018
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