Can someone assist me in understanding QSC's grounding scheme in their RMX amps? - diyAudio
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Old 8th May 2013, 08:35 PM   #1
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Join Date: Feb 2012
Default Can someone assist me in understanding QSC's grounding scheme in their RMX amps?

I see they have 3 grounds. Earth, A1, and P1 (speaker ground).

I see Earth is directly connected to A1, but I don't see where P1 is connected.
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Old 9th May 2013, 06:10 AM   #2
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Old 9th May 2013, 06:19 AM   #3
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Location: Skokie Il
It would seem logical to connect the speaker ground directly to the power supply board; or close to the center tap of the power transformer if there is no separate power supply board.

To me, calling it "P1" implies a power ground. This is consistent with good design practice.
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Old 9th May 2013, 07:29 AM   #4
Art M is offline Art M  United States
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Location: SF Bay Area
This circuit is like a bridge tied load with the speaker placed between P1 (the output signal) and the C120/ C121 junction the speaker return path.
Usually a BTL has both sides driven but in this case only one side of the bridge is driven (P1). The junction of C120/ C121 supplies a passive ( 0VDC) between the supply rails.

P1 is connected to A1 and GND through R20/ 6R8. This is more of a Low level path rather then any high current related to driving the speaker.

Last edited by Art M; 9th May 2013 at 07:48 AM. Reason: Clarification
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