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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: RE: You sure about "most"? posted by John Elison on August 21, 2020 at 14:05:10:
When a stereo amplifier is bridged and the speaker is connected across the red terminals, ground is no longer part of the signal loop that contains the speaker.
The concept that only one, of the two terminals involved, is doing all the alternating while the other terminal remains neutral in no longer tenable.
"Another way to think of amplifier/speaker connectivity is to think of the wires as water hoses. The amplifier creates alternating pressure and suction on the red hose while the black hose always remains neutral. Pressure on the red hose causes water to flow to the speaker and return to the amplifier through the black hose. Suction on the red hose causes water to flow to the speaker through the black hose while returning to the amplifier through the red hose. I don't know what could be more intuitive than that."
When connected to the two red terminals each terminal is pushing and pulling. When one is pushing (applying pressure to one end of the voice coil), the other is pulling (applying suction to the other end of the voice coil) and visa versa.
In this simple circuit there is one DC loop and three (complete) AC signal loops shown. Looking at the AC loop that contains the load, when one side is pushing the other side is pulling and visa versa.
In this simple AC circuit the same is true. The source is pushing into the load at one end while, at the same time, pulling at the load at the other end and visa versa.
Now reference the negative side of either of these circuits to ground and explain how that changes the function of the AC loop that contains the load.
In each example there is pushing from one side while, at the same time, there is pulling from the other side and visa versa. This remains true whether the circuit is referenced to ground or not.
In these two examples ground would be a meaningless point along the circle/loop.
Going back to a non-bridged SS amplifier the same is true.
Other than for safety considerations, why does the negative end of the power supply in a SS amplifier have to be referenced to ground? In order to work, it doesn't. And if it is (and it always is) remember, it's just one point along the AC loop. It's not a point were everything stops. It's not part of the loop. It's a point along the loop that happens to be referenced to ground. Nothing more.
Thinking of a tube amplifier with an output transformer (push pull or single ended) the same is true. I ground the low side of my output transformer for winding capacitance considerations. In a tube amplifier with global negative feedback (my amplifier uses no GNFB), the output transformer has to be referenced to ground for the feedback to work but in either case the fact that the secondary is referenced to ground does not change the reality that the speaker is being pushed and pulled at the same time from each end. Driven by both the red terminal and the black terminal at the same time.
Tre'
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- RE: You sure about "most"? - Tre' 09:39:24 08/22/20 (0)
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