Sub makes random noise...then nothing

Face

A few nights ago I was watching TV in my HT room and I hear a loud bang from the back of the room. I assumed it was something or someone outside. Went outside and I saw and didn't see anything.
Next day I'm taking a nap in here and all of a sudden I hear BANG and then my second sub started to make a feedback noise. I run over and shut that sub off and notice my ED sub is off and will not power on.
What would cause this to happen? I had a the sub connected to the outlet through a Monster Power Subwoofer PowerCenter SW200, so I assume it was protected from surges, etc..
I called Elemental Designs today and they took down my info and are sending a new amp to me today with a pre paid label to send the old one back. My type of customer service!
Since they're doing the right thing, I wanted to keep the conversation to a minimum with them, but am still curious, what would cause something like this to happen? Possibly a surge that make it through the MP SW200 or something internal in the amp, etc..?
Here's a link to the sub: http://www.edesignaudio.com/edv2/product_info.php?cPath=21&products_id=103
TIA!

THX 3417

Well I’m not that knowledgeable in the ins and outs of all electronics but that is a strange happening with the sub to fail under those conditions. I bet it was loud when making the sound that you described and you did the right thing. Hopeful the resolution will be resolved soon.

Face

Well, my TSS1100 sub that was connected to the ED sub now makes a hum.

THX 3417

FACE

Ground loop mate! Try the following here mate and see if this reduces the humming!

Take a small lengthy peace of wire that is insulated and attach one end to the a screw fixing on one amp then attach to the other amp.

This might fix the humming problem and don’t worry I’ve done this a few times with my home cinema set-up and it does work.

If the humming is still there, attach the wire to a different audio component, it could be somewhere between the amplifiers that is inducing this humming sound, or mains 60Hz hum!

Jim Shearer

I doubt you had a surge. Likely to have been a capacitor in the power supply that failed by short. (These units have the power supply on continuously so that it can turn on the amp automatically when music signal is present.) I had a computer blow a power supply in that manner. Loud bang followed by smoke & stench while I was sitting there typing. Scared the crap out of me.:eek:

Cheers, Jim

THX 3417

Lasareath

I say attach a wire like I described in the above, except connect it from the Sunfire to the digital TV box to the screw and see if the hum disappears?

I had a similar problem last year with an old SONY TV I placed in the room and it took me nearly 24 hours working around the clock straight to isolate the humming followed by buzzing and all I did after 24 hours was disconnecting the earth lead on the old active crossover unit.

Good luck its a dicy thing to locate that humming sound!

Also the line from video and audio outputs on the digital box you have are passing though the AVR or AVP you have? I guess if you try discounting one of the leads like video or the audio or both. Mix them around and see which one makes the humming sound.

If the video makes the humming sound, send the video lead to one of the TV monitors inputs and use. But 9/10 I’ve used my simple method and its solved hum and buzzes many times, only the combination changes but the basics are the same for me.

Bill Ayotte

Las,

I had a really prominent hum coming from my Super Junior when I first bought it...Are you using the stock power cord? This sounds odd as hell, but I replaced the stocker with a Signal Cable Magic Power Cord, and it disappeared....Just for **** and giggles, I hooked it up with the stocker again when I moved into this house, and the humming continued...At both homes I plugged it up with and without the Monster sub specific wall plug protector and the stock cable. It had a pronounced hum with and without the Monster plug installed, the hum being A LOT louder without the Monster product...Much to my surprise...I plugged it directly into the wall with the Signal Cable, and there was a very faint hum...With the Monster outlet piece installed, it disappeared. I don't know man, it worked for me....My cable line runs right by my sub and its power cable as well...I use a HTS 1600 conditioner for the rest of the upstairs rig, and it works great....Everything is dead silent.

THX 3417

Bill

You know what I think LOL the manufactures are holding back on the consumer. I mean don’t they test there products in the real world of many homes to help them to try and understand and isolate the elusive humming problems that is commonly associated with many top names and brands.

But I’ll say this even a professional cinemas sub bass system will produce some kind of hiss or hum but the level that I’ve noticed up very close I mean right up where the subs are positioned underneath the centre channel and behind the masking. But what I often hear sometimes in the home is far worse.

Some subwoofers might be humming sound bad because the drivers magnet structure is so close to the internal transformer that is built inside the enclosure. This is why I don’t really prefer the term active sub bass the name isn’t special at all.

You’d be better off with a professional 18” cinema sub bass and an active crossover that is separate from the enclosure and the amplifier that drives it. Humming if any, would be far easy to isolate quickly, plus cinema types look far cooler in the home than any other sub bass.

Deadof_knight

they figure if its bad we will send it back and get it warrantied ......thats R and D the porboys ways or the cheapskate

THX 3417

If I understand you correctly that doesn’t sound like the right attitude?

THX 3417

Lasareath

Hmm you make a good statement there. I wonder if you just buy a cheap ole four-way power lead socket and plug it into the same outlet that is driving the rest of the system.

Don’t know a whole lot about (ring mains) and how the internals are wired in the home except safety is paramount!

Give it a try and if that fails try again I hear this Monster cable can be a very costly affair.

For audio alone I’m running 20 audio and visual items 21 if you included the Toshiba TV monitor.

The load will gradually lighten over the next few months and then step back up with different components being added and subtracted from the sound system. And worry if I’m going to have to tackle ground loop hums and buzzes, one step at a time.