My approximately 6 year old sub keeps clicking in and out. It now only works erratically. I'm assuming by the other posts that the amp is bad. And could someone explain the reason to hook up speakers through the sub?
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If you remove the signal cable from the amplifier while the Sub is switched on (turned down about half way) you should hear a thump sound. If you do that proves that your sub is working and you need to look at your Yamaha. Perhaps the sub channel has been disabled in the logic settings. Check the speaker configuration pages. If all looks well reset your amp to factory settings and try again. I have had a logic glitch which was fixed in this way.
Check the status indicator - The LED found on the front panel should be illuminate in blue
when the subwoofer is functioning. If the unit is in Auto mode and is not receiving a signal, the light will remain off. Try setting the power switch on the back to ON if in the Auto setting.
Post back the status of your LED.
I wouldn't try reinventing it by replacing the driver. Drivers and their enclosures are designed to work together. And this being a self-amplified subwoofer, there is one more piece that's electrically optimized to the rest. Don't mess with it.
Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.
Is your receiver properly channeling Low Frequencies to the sub? Experiment with the cutoff, too.
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.