Axiom Home Page Forums General Discussion Technical Questions Are the demons back JohnK? EP600 strange issue....

Well it is good to know that John and Peter have experienced the same issue. It would be my guess that others just have not come forward.

Anyone from Axiom want to comment on how electrical storms would cause the DSP subs to cause this haunting experience?

No electrical storms where I live. Just snow and rain. I did have the thumpity-thump problem a while back though. One other person did too. An power off/on fixed it and I haven’t had to do that again.

Not really answering your question but I thought I'd mention that I must be much more paranoid than a few of you. There is no UPS or power conditioner, I can certainly afford, to trustingly keep my electronics safe during a lightning storm. If the storm gets close, I unplug my AV gear and my PC. I have even gotten spooked enough to disconnect the leads coming into my invisible fencing transmitter. (Nothing like having an acre & 1/2 worth of lightning rod buried around your back yard.) Any other appliances are fair game.

There are some very good products that get into milliseconds for opening a circuit at risk. I guess I am just am not convinced they were designed to isolate electricity so strong it's arcing from sky to ground.

After I run around unplugging my stuff, I go out on my covered deck to watch the show. Go figure......

Try turning on the closet light. See if that makes it go away

Did you have your cel phone close to the EP600 or your AV receiver when it was doing that noise?

Now that is funny! I almost spit my water out on my keyboard...... ha ha lol

Andrea conducted a poll at Axiom, and to a person none of us have experienced this or even heard of it. Our house gets hit quite often by lightening (which is awesome if you happen to be watching a scary movie at the time and then you see a blinding flash of light actually in the house! Creepy! And then you get the fun of running around and seeing what appliance you lost!) but we have never had the thump come up. Caveat could be that we live in God's country? Tom's away on a Top Secret Axiom Mission right now but I'll follow up with him when he gets back.

Thanks Amie, it is very strange. Now that I've unplugged the sub and plugged it back in, the woofer activity/noise is only noticable if I pratically put my ear within inches of the driver cone.

It will be interesting if the noise gradually builds and gets louder over time..

Here's what Tom Cumberland had to say:

"MoJo is right. The very high power of the amplifier makes it suseptable to line surges. During mid-west and florida lightning storms the AC power lines outside the house are going up and down trying to regulate the line voltage.
This would normally not be a problem as most subs don't go down as flat as ours does. The amp sees these as audio from the point of view as voltage variations, hence the thumping."