Just interesting: both woofers went out at once!

Posted by: VoicOfReason

Just interesting: both woofers went out at once! - 08/20/12 06:46 PM

I don't need tech. support for this since Axiom has 2 new woofers on the way, but anyone have a clue as to why both the woofers on my new VP180 would go out at once? No physical, cosmetic damage at all. No loud sound levels. Speaker internals fine since my M80 woofer works fine in the VP180 spots.

Strange???!!
Posted by: Boltron

Re: Just interesting: both woofers went out at once! - 08/20/12 07:18 PM

Something is probably wrong with your amp. It must have output a DC current which is fatal to speakers and you will probably not hear anything.

I would be careful before plugging in another good speaker, try with an old expendable one first.
Posted by: bridgman

Re: Just interesting: both woofers went out at once! - 08/20/12 09:46 PM

Did they just stop working, or are they making scratchy noises ?

If both went out together my first thought would be a connector or something on the crossover PCB, and putting the M80 woofer in wiggled <whatever> back into position again.
Posted by: Gary Vose Sr

Re: Just interesting: both woofers went out at once! - 08/22/12 09:04 PM

It seems to me that the blown woofers are a result of something occurring up stream of them. Damaged wiring perhaps, or maybe a half secured connection possibly.

Do you by chance Bi-wire?
Posted by: VoicOfReason

Re: Just interesting: both woofers went out at once! - 08/23/12 01:03 PM

I went back and forth between woofers. M80 one worked, VP180 didn't. So if I wiggled it back on it would have been fixed after that. Can't be a wiggle problem, esp. with 2 woofers at once.

If it were the amp, why would the woofers stop working only and not the other speakers as well? Also, it happened while I was out of town and the amp was completely off.

Connections are all bananna connectors and are as secure as they could be with heavy gaugue wire.

One of the woofer works just barely. The other one not at all.

Amp is an Emotiva XPA-5. Not just a cheap amp.
Posted by: SirQuack

Re: Just interesting: both woofers went out at once! - 08/23/12 09:43 PM

drive the speakers with your denon to rule out the amp, not real fond of Emo's, long story, so hopefully that is not the problem.
Posted by: VoicOfReason

Re: Just interesting: both woofers went out at once! - 08/24/12 02:59 AM

But, if I take an identical woofer from my M80 and attach it with the same Emo amp, it works just fine. Also, I switched channels on the amp and it made no difference. So, I don't think using the Denon amp would fix things.
Posted by: AdrianD

Re: Just interesting: both woofers went out at once! - 08/27/12 11:09 PM

It may have been a power spike/surge of some kind; this can be ruled out easily: was the amp unplugged?

The reason I'm thinking about this possibility is that I went through something like that, but with much dire consequences. My two Emo monoblocks are toast (displaying different behaviour), as well as the 2 M80: one has the woofers gone, the other the mids and the highs. I somehow doubt that in my case the actual drivers are one; I'm inclined to believe that the crossovers are at fault. We'll see, as both speakers are back to Axiom. The casue for my case was a lightning storm; if a high enough current is present, it will arc over whatever protection you may have. My amps were both plugged into a dedicated 20amp line and into a Monster power surge protector; also, I understand the Emotiva amps have surge protectors in them.
Posted by: BlueJays1

Re: Just interesting: both woofers went out at once! - 08/28/12 08:46 AM

Originally Posted By: AdrianD
It may have been a power spike/surge of some kind; this can be ruled out easily: was the amp unplugged?

The reason I'm thinking about this possibility is that I went through something like that, but with much dire consequences. My two Emo monoblocks are toast (displaying different behaviour), as well as the 2 M80: one has the woofers gone, the other the mids and the highs. I somehow doubt that in my case the actual drivers are one; I'm inclined to believe that the crossovers are at fault. We'll see, as both speakers are back to Axiom. The casue for my case was a lightning storm; if a high enough current is present, it will arc over whatever protection you may have. My amps were both plugged into a dedicated 20amp line and into a Monster power surge protector; also, I understand the Emotiva amps have surge protectors in them.


What happened in your case is that you had a destructive surge come in from the outside line and was seeking to find earth, in this case it was your amplifier. Internal protection found in the appliances and those found in surge and UPS strips are NOT rated to handle destructive surges and are easily overwhelmed as you noticed in your case. Plug in surge protection strips and the protection found in UPS strips are useless.

Despite the fact you still feel vulnerable, the good news is this problem could be solved in the future by purchasing and having an electrician install a "whole house surge protector" to your inside panel and grounding it to your homes single point earth ground. These protectors meet proper electrical specs and code and are rated to handle high energy transient voltage surges.

A whole house surge protector wouldn't have let the surge inside your home to begin with. A proper protector such as these would have just harmlessly grounded the surge outside. You would have never known the surge even existed.
Posted by: AdrianD

Re: Just interesting: both woofers went out at once! - 09/04/12 12:51 AM

Hmmm... I remember asking my electrician about that and why not every house come with one. He said it's not necessary any more; I better find another electrician grin
I thought that remark to be BS; in the country I'm coming from, all houses/buildings have something like that built-in.

In any case, thanks for bringing that up BlueJays1; I will definitely look into it.
Posted by: BlueJays1

Re: Just interesting: both woofers went out at once! - 09/04/12 07:26 AM

Originally Posted By: AdrianD
Hmmm... I remember asking my electrician about that and why not every house come with one. He said it's not necessary any more; I better find another electrician grin
I thought that remark to be BS; in the country I'm coming from, all houses/buildings have something like that built-in.

In any case, thanks for bringing that up BlueJays1; I will definitely look into it.


You won't see Holmes on Homes disregarding them. You see them ALWAYS install a unit on the panel. Doesn't matter if its a new house or just doing maintenance on the electrical of an existing house. Even more necessary in the area you live in - Ontario. There have been 3 posts in JUST the last month on this forum that have had home theater equipment and home appliances ruined from a destructive surge. None of these individuals had proper protection - a whole house protector. It's also a lesson in how useless plug in surge protection strips and surge protection found in UPS devices really are.

What do you think is the better option? Earthing the surge outside or like in your case having the surge destructively seek ground in your home via your electronics/appliances