help? installing speaker, getting "blown" amp

[lotas 10+ year member]

Hard to describe in a title but heres the deal. I hooked my speaker up before it was in the door to make sure it worked and it did. Woo. So I set it in the door, and start screwing while its still playing. I screw in the top first or something, and then I goto screw in the opposite side. Naturally this is moving the speaker a certain way as I screw it. Well all of a sudden the speaker goes out, and the music is crackly and vague. Then if I pull out a little, taking pressure off of the speaker, the music comes back on crisp and clear and full. Let go, back to crackly.

This process ends up blowing the right channel on my amp. What is going on here? I always wrap the terminals and connectors in electrical tape, so thats not it. Is somtehing else touching metal back there, grounding something out, and thats blowing the channel on my amp, or what? Any ideas I would appreciate them, thanks.

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