2002 with Mark Levinson audio. I replaced the blown factory sub with a Dayton Audio 8” 8ohm dual voice coil sub today. I'll put more details and advice in the comments for
So optimieren Sie Ihren AV-Receiver: 10 Tipps - pc-magazin
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GIRA 569401 Speaker Connector 4-Way Use Cream White : Amazon.de: Home & Kitchen