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Can a two wire speaker system with RCA plug be chnaged to XLR 3 without chnaging the impedance?

Changing the connector type from RCA to XLR does not directly affect the impedance of a speaker system. Impedance is determined by the speaker's voice coil and is independent of the type of connector used.

However, it's important to note that XLR connectors are typically used for balanced audio signals, while RCA connectors are unbalanced. To maintain consistent impedance and signal quality, you would need to ensure that the speaker system can accept balanced inputs or that you use a suitable converter to convert the unbalanced signal from the RCA inputs to a balanced signal for the XLR inputs.

Additionally, XLR connectors have three pins (ground, positive, and negative), while RCA connectors have two pins (positive and ground). To connect an RCA cable with two wires to an XLR input, you would need to connect the positive wire to the positive pin, the ground wire to the ground pin, and leave the negative pin unconnected. This configuration would effectively make the RCA cable unbalanced and may introduce noise or signal integrity issues, depending on the specific equipment being used.

Overall, while changing the connector type from RCA to XLR doesn't directly affect impedance, it does require ensuring compatibility with balanced inputs and potentially introducing other factors that could influence sound quality. For optimal performance, it's always best to follow the manufacturer's recommendations and use the appropriate connectors and configurations intended for the speaker system.