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<blockquote data-quote="forbidden" data-source="post: 566946" data-attributes="member: 552189">The fuse would not be part of the problem. All it would do is blow if there is a fault in the amp that the protection circuit cannot control, if there was a short on the power line, or if you drew an excessive amount of current through it continueously. Are you sure this amp does not have 4 gauge power / ground inputs? I have not seen one of these in person but based on all the old Rockford amplifier, they usually had the 4 gauge inputs. They didn&#039;t just stuff a 8 gauge in there because that&#039;s what they had I hope. You need to get a resistance check done on the ground lead.I read your post again and to me it seems that everything is working as it should. You have placed quite a demand on this amplifier and if the amp is going thermal after 30 minutes, your playing the amplifer so hard that the thermal protection circuit kicks in to keep the amp from melting. An amp is designed to get hot, but the longer you push it and the louder you want the system to play, the more heat it is going to put off. Not much can be done about this. A cooling fan is going to help but not much. A class D amplifier might have been a better idea for you in this case. Turn the gain down on the amp in the meantime, same with the bass boost if you are using it. By having these turned up excessively will definitely speed the amp in it&#039;s way to thermal protection.</blockquote>

[QUOTE="forbidden, post: 566946, member: 552189"] The fuse would not be part of the problem. All it would do is blow if there is a fault in the amp that the protection circuit cannot control, if there was a short on the power line, or if you drew an excessive amount of current through it continueously. Are you sure this amp does not have 4 gauge power / ground inputs? I have not seen one of these in person but based on all the old Rockford amplifier, they usually had the 4 gauge inputs. They didn't just stuff a 8 gauge in there because that's what they had I hope. You need to get a resistance check done on the ground lead. I read your post again and to me it seems that everything is working as it should. You have placed quite a demand on this amplifier and if the amp is going thermal after 30 minutes, your playing the amplifer so hard that the thermal protection circuit kicks in to keep the amp from melting. An amp is designed to get hot, but the longer you push it and the louder you want the system to play, the more heat it is going to put off. Not much can be done about this. A cooling fan is going to help but not much. A class D amplifier might have been a better idea for you in this case. Turn the gain down on the amp in the meantime, same with the bass boost if you are using it. By having these turned up excessively will definitely speed the amp in it's way to thermal protection. [/QUOTE]

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