Ralph (Atmasphere), thanks for what as I see it is really excellent info and background, including the proof that is provided in your first post above, which strikes me as extremely persuasive. A few days ago I provided a link to that post in a couple of the ongoing cable threads.
Wolf, keep in mind that even if the equipment has very low output impedance and very good drive capability, it does not meet the standard if it connects XLR pin 1 to circuit ground, as opposed to chassis.
As Ralph indicated, and as is indicated in Figure 1b and some of the text in this paper, it is very common for pro equipment (as well as consumer equipment) to connect pin 1 to circuit ground, in violation of the standard.
Ralph, is there any threshold that can be defined for how low the resistance that may be designed into a component between circuit ground and chassis ground can be without defeating the purposes of the standard?
Also, to eliminate interconnect cable differences is it necessary that the component output actually BE driving a low load impedance (2000 ohms or less, to use your figure), or is it just necessary that it be CAPABLE of doing that?
Thanks again. Best regards,
-- Al
Wolf, keep in mind that even if the equipment has very low output impedance and very good drive capability, it does not meet the standard if it connects XLR pin 1 to circuit ground, as opposed to chassis.
As Ralph indicated, and as is indicated in Figure 1b and some of the text in this paper, it is very common for pro equipment (as well as consumer equipment) to connect pin 1 to circuit ground, in violation of the standard.
Ralph, is there any threshold that can be defined for how low the resistance that may be designed into a component between circuit ground and chassis ground can be without defeating the purposes of the standard?
Also, to eliminate interconnect cable differences is it necessary that the component output actually BE driving a low load impedance (2000 ohms or less, to use your figure), or is it just necessary that it be CAPABLE of doing that?
Thanks again. Best regards,
-- Al