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My sunfire true sub mk4 won't turn on unless i'm pushing the volume to extreme levels. And when it finally does it pops on and then will turn off again if I lower the volume.
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Hi, I had the same problem as this, the fix was quite simple and the hum never came back.
If you pull straight out on the sub amp's volume knob it will slide off, then to fix the hum, tighten the nut that is behind the knob on the potentiometer and your hum should go away. My hum went away and never came back after this fix. Hope this helps you.
R99 on the Sunfire True Sub Junior is a surface mount resistor (no color bands), and measures 51k ohms. R102 near it is colored gray, red, brown, gold.
Before we get too committed to a direction to go, or embark on unnecessary surgery, can we establish that we KNOW it's the speaker and not the amp or source? Perhaps you could swap it with the other one.
Back to basics: is this a sudden-onset problem or did it always behave like this? Try swapping locations with the other one. Bass response is a lot about location, location, location. Standing waves, self-cancellation, phasing. All players in this game.
If you remove the volume knob, and tighten the nut below, it should take care of the popping noise, as well as any input noise issues. Based on my experiences with my MKII
A few more questions-
Does the sub hum without anything plugged into it except for power? If it makes a real loud hum almost a squeal then I think the rca cable between the receiver and the sub is dead shorted and needs to be replaced. If it's more of a low level hum, then it's a ground hum caused by many things, ie........the receiver and the sub being on different power circuits in the house.......sometimes diconnecting the cable tv feed as it enters the room while the sub is connected and humming to see if it stops........the easy fix sometimes is using a 3 to 2 prong ac adapter but lifting the ground on such a powerful amp could be a fire hazard.
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