speakers poping when cut off car switch

[hllywood29 10+ year member]

hi i was wandering if anyone can help me when i turn off my car switch there is a poping noise in my speakers.the shop where i had everything installed has tried everything to fix it.they seem to cant find the problem.i have 2 18 treo ssx 2 2000.1 treo ssx amps and treo components 20f tsunami cap 2 kinetic 2000 batts

eclipse 5500 avn head unit and a treo 200.2 amp for highs.any ideas what could be i would appreciate it.thanks

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