Quote:
A D cell battery connected to speaker leads will cause the speaker to buzz.

Maybe a POS speaker would buzz under DC, but a good one shouldn't (as others are arguing).
Even with a <POP!> you'd still have a very basic test of the speaker.
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10101311 (20GB- backup empeg)
10101466 (2x60GB, Eutronix/GreenLights Blue) (Stolen!)