Subwoofer hum?

Question

When I shut off my yamaha receiver (did this with my old receiver also so it is not a receiver issue) I hear a humming noise from my sub.

Never any trouble when the system is on....and also when wiggling the sub cable around a bit it stops humming, but starts again later on as the cable is never able to stay in a position where it's ok.

I am using a Monster THX Ultra 1000 Series sub cable.....could it be a sub cable problem?

Answer 1

What do you mean the cable isn't able to stay in a position where it is Ok?

It is possible you have a bad cable, Monster products have a lifetime warranty do just take it back to get it exchanged. More than likely you have another issue. Do you have filtered power going to both the sub and receiver or just the receiver?

Answer 2

If it were a ground loop or 60 cycle hum I doubt if wiggling the cable would affect it. It could be that either the cable is defective or loose. Monster cables are designed to be twisted once they are pushed in. Make sure the connections are snug. It could also be a problem with the RCA input on the sub. Try a different cable with it and see what happens. If the new cable fixes the problem follow Flapjack's advice and get a replacement for the old one. They are guaranteed for life. If a new cable does not correct the problem you have a problem with the sub itself. It may just need some solder. Take it to a reputable repair tech for an estimate. Call your local high-end stores to see who they recommend.

Answer 3

If wiggling the cable makes the hum come and go, may be a problem with the cable itself, the connection on either end, or the internal circuit between the connector where the cable comes in and the amplifier.

It can also be a different circuit altogether, an internal intermittent that is being mechanically stressed by the cable moving around.

It's easy enough to try a different cable. Any RCA cable will work fine for this. No hum = bad, overpriced Monster! No cookie for you!

If changing the cable has no effect, here's another thing to try: disconnect the sub from the signal altogether (that is, disconnect your Monster RCA cable from the sub) , while leaving the sub powered on. Crank up the sub volume and user your fingers to try to move the RCA input connection jack around a bit in different directions, and tap on it gently. Any noise or hum that occurs indicates a loose connection, bad capacitor, or bad solder joint internal to the subwoofer. That will require a service call but should be fairly easy and inexpensive to fix.

Good luck.

Answer 4

I heavily do not propose getting a 'cheater plug' as reported with the aid of yet another reaction. it somewhat is risky and can desire to finally finally end up costing you your existence. Many subwoofers place self assurance in the earth and removing it may create an unearthered circuit so once you touch the steel casing of the RCA connector, you become the earth and truly DIE (this has happened many situations interior the previous). The subwoofer has an earth for a reason and could be stored. in spite of the indisputable fact that, the respondent replaced into appropriate in asserting it somewhat is a grounding difficulty. it somewhat is ultimate resolved making use of an Earth Loop Isolator that's obtainable in any respect good digital shops. This gadget might desire to value you around $20 and plug in line on your cables. They use small autoformers to do away with the earth without destablizing the subwoofers capability source. You pronounced you tried distinctive capability plugs. have you ever tried a distinctive capability element on a distinctive circuit? this might resolve the subject maximum situations.

Answer 5

I spent months trying to work out my hum, but I finally nailed it with some assistance of my electrician Buddy. Basically there are 2 devices in your house that are conflicting. One is the the sub, and the other is something else plugged into another socket creating a ground loop hum between them. Leave your sub on (in hum mode!) then systematically switch off every wall socket one by one to find the conflicting device. Start in the same room, then work your way out. I found mine was my cable modem. plugged in 2 rooms away. As soon as I unplugged it, the hum stopped. What a feeling!!!! Sort out the grounding issue on the offending device and it'll be champagne viewing with thumping sub action.

Answer 6

Could be a ground hum problem.

HERE'S A LOW-COST POSSIBLE FIX:

Go to your local hardware store (I mean, if your town still has one and hasn't been tortured out of existence by Wal-Mart or Home Depot) and in the electrical section, buy one of those little orange 3-prong-into-2 adaptors.

If your sub has a 3-prong cord, use it right there. If your sub is plugged into the surge protector, put it on the surge-protector's plug...yes, it might circumvent part of the purpose of that device, but how sick of the hum are you at this point?

If that $1.99 attempt doesn't fix the hum, then something has in fact fried inside your sub... might want to consider replacement (in the end, fixing it could end up costing about the same, depending...) Last ditch: check to see whether the wall circuit your sub is pugged into shares with a dimmer in the house...that could cause the hum, too. Solution there: ummm, relocate your subwoofer and see if that helps.

Good luck and let me know how it goes!

Rod Pera

Answer 7

If your sub is active, it could be 60 Hz-cycle hum from your wall outlet. Try changing where you plug it in, turning on and off aplliances in the house while the sub is on. If this alters the hum, get a filtered power strip to plug the sub into.

Answer 8

Hi. It sounds like a loose connection of your cable connector that goes into your sub. Can you undo the connector and see if there is a broken wire .Also the outer part(ground) of the connector could be a bit loose when it is plugged into your speaker.