2004 V50 T5 Summum: All speakers defective… 🙂

Hello guys, Are a few days I heard in my V50 T5 summum no basses anymore… That’s ka****, because with a Premium Sound Packet that would be great. Anyway, the mechanic at the Volvo dealer said now that all 4 loudspeakers in the doors are broken and you can’t really explain it… Does any of you know this phenomenon??? Greetz Joe