tweeters not working

[orioles26 10+ year member]

Im running an active setup and the tweeters and mids are connected to a 4 channel amp. But now the tweeters have stopped working but the mids play perfectly. The only noise the tweeters make is an ocasional crackling sound. I also noticed that since the tweeters don't work i dont here the feedback anymore. So could the rca's be the problem since the headunit is an 880prs.

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