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ctrain

Question about door chimes.

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I was wondering (and there may not be an answer) why the NYC subway trains all seem to have a differently sounding door chime?

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I was wondering (and there may not be an answer) why the NYC subway trains all seem to have a differently sounding door chime?

 

I'm not sure why there are two variants (R44/46/64/68 and R142-), but to me it seems that the latter, which is slightly fainter and higher-pitched is more pleasant, is there for that reason. Personally, I hate the deep beeps on older trains; they always seem to resonate and give me a bit of a jolt.

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I remember hearing somewhere the doorbell noise is electronically generated by the speakers...if that's the case then how can the noise go bad?

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