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Gk backline 600

I have a gk backline 600 when you play through it it sounds like the speakers are blown I took it to a friend of mine we plugged it into his gk 410 cabinet it sounded the same way I checked the cable to make sure it wasn’t bad it did the same thing I checked with my Warwick and my Spector both active my friend had a passive bass same results any information would be appreciated