Polk SDA 2 Crackling sound in left speaker

Hi all.
New to the group. I own some Polk SDA 2's (1 tweeter - 2 mid-woofs) and I love their sound but I don't think I'm getting all that I can out of them with my current set up. So I tore down my studio to rearrange. When I hooked everything back together I switched amps to a Crown CE 1000. 275w at 8ohms - 450w at 4ohms. I had been powering it with a Hafler1600 (75w/8ohms) figuring I would get a truer sound with the added power. Before I hooked it up I tried to find out if the Crown is a common ground amp. Couldn't ascertain if it was so I just said 'screw it' and hooked it up. (cue ominous foreshadowing doom music...)

So I anctiously powered everything back up and the Polks sounded phenomenal!! HUGE.

Until...my left speaker began to crackle badly. The sound sputtering in and out. Then it would correct itself and sound great again...then more crackling. I freaked out and shut it all down. Checked the wiring and connections. Made sure that it was in fact the speaker and not the amp or something else. It's definitely the speaker. So here I am thinking....

Damn. Did I blow something??

Anyway, that's my tale of woe. I was hoping someone here could give me a plan of attack to further diagnose or fix the issue.

Thanks in advance for any assistance.

- Smit

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