Has anyone?? Can you please advise what you see/hear smell when this happens?
Please
thanks
Jag

No.

But damaged the tweeters. :\

Oh.
OK
that means when an amp goes into oscillation,you will damage your tweeter, not the amp, is this right?
may i ask how it happened ....

Please I have to know
Is there a prewarning of impending disaster or does it go pop immediately?

I ask becasue i want to experiment with the Kondo Silver speaker cable which is good for my speakers

...Cheers
Jag

When going into oscillation, the amp will overheat. The oscillation won't blow the amp itself, it is the overheating that will fry it. As Kuma said, if the oscillation has low frequencies, it can damage the tweeters.

quote:

Originally posted by Jagdeep:
that means when an amp goes into oscillation,you will damage your tweeter, not the amp, is this right?

I was lucky, the only thing went was tweeters. Could have been other drivers, I suppose...

quote:

may i ask how it happened ....

By being overly optimistic.

The thing is the amp doesn't have to be playing loud. I was playing a solo piano music at a moderate level.

quote:

Please I have to know
Is there a prewarning of impending disaster or does it go pop immediately?

I could not detect any early warning except when I lost the tweeters, I have heard distortions.

quote:

I ask becasue i want to experiment with the Kondo Silver speaker cable which is good for my speakers

They might be good for your speakers, but they might not be good for your amp.

Play at your own risk.

Jag

I believe we are talking about Living voice Avatar OBX's here right?

Drop Kevin an e-mail. I am sure he will give you a straight answer on what is most at risk amp or speakers and probably advise if it is really going to give a big improvement even if it works.

regards
Geoff

I have and it was a doosy. I had a mark levinson something or other on dem, the amp made a very loud noise like something from star wars "chu chu chu chu" it got faster and faster then went up in a cloud of smoke. It was freakin spectacular! Nothing from naim has given me as much excitement. Dealer was great, he couldn't have cared less.

Hey Vern ...kewl!

Geoff, yup, the LV's are the the ones at the end. I've tried contacting them at LV but they just dont answer. I'll try again. Ta

Kuma/Manu... thanks for the input dudes

I'm going to be a weeeee bit more cautious

Jag

Have a look at the attached "Zobel network" (Step 3) and ask around if this may will help your oscillation issue. I am no expert but I thought they were designed to eliminate oscillation as a risk. You may be able to get a set from Merlin or through your Naim resources.

http://www.merlinmusic.com/howto_sglwrg.htm

Naim amps already have a Zobel network at the speakers output, so no gain to get with that.

what cause an amp goes to oscillate?. How about if a cdp gone into oscillate, does it effect the amp?

Manu
From what I have gleaned from the forum, Naim amps do not have zobel networks, thus the mandatory usage of either the NAC A5 speaker cable or cable with similar specifications.

regds
Jag

Jag

Have you read Manu's profile ? His occupation is ....

Heheheh! OK, OOPSIE!
Manu is right... then, why the big hoohah that we MUST use NACA5 cables?
I was under the imnpression that we had to use the NACA5 because they stabilised the amp because the amp did not have a zobel network....

Now I am mega confused....
Manu, help needed, please respond to help me clear my head..
ta
Jag

quote:

Originally posted by Jagdeep:
Manu
From what I have gleaned from the forum, Naim amps do not have zobel networks, thus the mandatory usage of either the NAC A5 speaker cable or cable with similar specifications.

Jag,

the specific capacitance & inductance values of Naim A4/A5 speaker cable combine with components inside the amp to form a Zobel network.

Naim amps are not unconditionally stable unless speaker cables of the correct electrical characteristics are used.

cheers, Martin

Ahhhh
So, the cables are PART of the zobel network, they do not REPLACE the Zobel network altogether....

Now I Kapish

Thanks Martin.

Yes , or if you want: the zobel network is tuned for the NACA5 cable.

It was always my, somewhat dubious, understanding that this use of the cable's characteristics "extended" the amplifier's output to the speakers input. Most people, it being argued, having around 5 metres between amp and furthest speaker.

I bet I get laughed at tomorrow.

quote:

Originally posted by Manu:
As Kuma said, if the oscillation has low frequencies, it can damage the tweeters.

I assume that you're talking about an active system, because this is unlikely to happen on a passive set up, the crossover will send the low frequencies to the woofer.

Dammages could occur if the amp let go DC to the speakers when the output transistors are giving up at trying, but a fuse or some sort of active protection system might kick in before this could happen.

Bye.

quote:

Originally posted by Stoik:

quote:

Originally posted by Manu:
As Kuma said, if the oscillation has low frequencies, it can damage the tweeters.

I assume that you're talking about an active system, because this is unlikely to happen on a passive set up, the crossover will send the low frequencies to the woofer.

What is a normal oscillation frequency? Perhaps well above 20KHz?

cheers, Martin