Received the two speakers yesterday. Had to swap the connector from the old speaker to the new speaker. Here are the results:

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Works like a charm! Because of the higher impedance of the new speaker, I expected the volume to be somewhat softer. However, when using same volume selections, I can't notice any volume difference when comparing this nüvi 2495LMT with a nüvi 2595LMT which I have lying around too!