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<blockquote data-quote="generae" data-source="post: 8887982" data-attributes="member: 692827">Hi all, Everyone on this forum appears more knowledgeable than me, which wouldn&#039;t be hard!Problem; I have a basic (cheap) 4x25W RMS output head unit (no sub-out) and recently wired a 600W max (maybe 200W RMS) subwoofer to it via the rear speaker circuit just before the HU and after a few weeks of use, suddenly no sound from the speakers at all, including the subby. HU still does everything it&#039;s supposed to do except no sound output. Power still going to the sub as the light is still on. No fuse issues. Wiring at the speakers and the sub and the back of the HU looks fine.Rear speakers are 30 years old but front ones maybe 6 years. Car is a 1993 Saab 900 Turbo.I am thinking that the amplifier in the head unit is blown because of the sub.My current thought on a solution is to replace the head unit with one that has a sub-out.An upgrade on this solution might be to get a HU that has RMS output greater then 4x25W as well as the sub-out but I&#039;m not sure if this is necessary or would be of any benefit.Any advice will be wonderful.</blockquote>

[QUOTE="generae, post: 8887982, member: 692827"] Hi all, Everyone on this forum appears more knowledgeable than me, which wouldn't be hard! Problem; I have a basic (cheap) 4x25W RMS output head unit (no sub-out) and recently wired a 600W max (maybe 200W RMS) subwoofer to it via the rear speaker circuit just before the HU and after a few weeks of use, suddenly no sound from the speakers at all, including the subby. HU still does everything it's supposed to do except no sound output. Power still going to the sub as the light is still on. No fuse issues. Wiring at the speakers and the sub and the back of the HU looks fine. Rear speakers are 30 years old but front ones maybe 6 years. Car is a 1993 Saab 900 Turbo. I am thinking that the amplifier in the head unit is blown because of the sub. My current thought on a solution is to replace the head unit with one that has a sub-out. An upgrade on this solution might be to get a HU that has RMS output greater then 4x25W as well as the sub-out but I'm not sure if this is necessary or would be of any benefit. Any advice will be wonderful. [/QUOTE]

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