In your first post, you included the link for the speaker twice and there is no link for the amp. Not sure what amp you bought. When do you hear the crackling sound, is it all the time, or just when the system first turns on? Does the sub produce bass?
Rich G. 2005 Wrangler 4.0 6-Speed.
just4effect 10" single sub, enclosure and amp 4 sale. PM me if interested, local only