Mirage omni 8 subwoofer, loud humming. I unplugged from audio receiver and still hums only louder. Can it be fixed or trash it? Thanks so much.

need to replace the amp assembly...common problem on this model.

probably the amp. you may be able to replace it with another same sized from Part Express.com. just don't get an overpowered one

i have same isue humming like hell ,change 2 power supply capasitor didnt do it ,try to changer 2 mosfest transistor Samsung IRF640 N-channel MOSFET TO-220 200V 18A hope it will do it ,on ebay for a 2.00 each .
i think it is power supply isue ,recterfile circuit not clean it will give you that 60hz humming noise ,good luck
will let you know how it turn out ..

This sounds as if a component has blown on the crossover board. (Probably a capacitor.)

I'm thinking you have an open shield ground on the RCA input side. Connecting speaker inputs possibly restores the ground. Try connecting the high level inputs then disconnect the remote end of the cables (floating the grounds).

Then get out an ohmmeter and find that open circuitor or bad solder joint between RCA ground and real ground in the speaker's amplifier. Or.... if speaker ground kills the hum and you want to use RCA Line Level input to the sub, just connect one minus speaker output on your source amp to one minus on the sub's amp.

jd40,
Sounds like a grounding issue. The first two places to look into is the powered subwoofer and antenna. During your last test, did you leave the FM antenna and subwoofer connected? Many times the hum is directly related to the antenna and/or the subwoofer and to how they are grounded; creating a ground loop through the receivers ground on the outlet. If the antenna is grounded to the dwellings wiring, hum is inevitable and sometime you can get a ground loop hum from how or how & where the subwoofer is grounded. Try taking them completely out of the loop.

Also try taking it further back to the basics, start with the receiver plugged into a known good grounded outlet with no surge or line conditioner in the loop and nothing connected to the receiver, nothing. Use one speaker and different wire to test each speaker output while in tuner and any other mode but phono. With no signal, you will either get nothing (no hum or static) or just static in the tuner mode. No hum is a good sign. Some systems will mute the speakers if no signal is connected to eliminate the static from being produced through the speakers but a ground loop hum will most likely still be produced even in mute. If you get a hum when nothing is connected to the receiver, try looking into getting a better grounded outlet, even maybe to a different dwelling.

-Chris

check your rca ground on the woof or the receiver you have a bad ground on one

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.

just try leaving it unplugged for a while thats what i did and it fixed it

Hi There, Please advise us what happens when you turn off the sub woofer is the hum still there....??

From YUBEUT.