Speakers Causing Amps to Blow?

Old Corps · 30th April 2004, 02:13 AM

I aquired a set of Jensen JP 1200 speakers. I hooked them up to a JVC shelf model system, i.e. tuner, amp, cassette and cd player all in one, it sounded great for about 2 minutes, then nothing, no sound. I bought a used Pioneer amp (70 watts per channel), and a tuner, hooked up the Jensens, sounded great for about 2 minutes, then poof, gone, no sound. Any suggestions?

MikeB · 1st May 2004, 11:45 AM

The featurelist to these speakers say:

* Recommended Amp Power: 300 watts

Maybe you shouldn't connect PA-Speakers to some very "simple"
Amps...

I believe, these speakers have a very reactive load, so you might
need an amp with big current-capabilities. Your mentioned amps
really cant. These are mostly cheap chipamps for a normal 8ohm-load.
I believe your amps simply overheated and the shortcircuitprotection
can't really protect against big inductive loads.

Mike

pinkmouse · 1st May 2004, 11:55 AM

It does seem a little strange, perhaps the speakers are faulty? Or are they designed to be arrayed, and only have a low impedance, such as 2 ohm?

MikeB · 1st May 2004, 12:03 PM

They seem to be rated at 8ohms, but maybe you should measure
their DC-resistance with a normal multimeter. I think you should
measure at least ~5ohms.

30th April 2004, 02:13 AM	#1
Old Corps diyAudio Member Join Date: Apr 2004 Location: Indiana	Speakers Causing Amps to Blow? I aquired a set of Jensen JP 1200 speakers. I hooked them up to a JVC shelf model system, i.e. tuner, amp, cassette and cd player all in one, it sounded great for about 2 minutes, then nothing, no sound. I bought a used Pioneer amp (70 watts per channel), and a tuner, hooked up the Jensens, sounded great for about 2 minutes, then poof, gone, no sound. Any suggestions?

1st May 2004, 11:55 AM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	It does seem a little strange, perhaps the speakers are faulty? Or are they designed to be arrayed, and only have a low impedance, such as 2 ohm? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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1st May 2004, 11:45 AM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	The featurelist to these speakers say: * Recommended Amp Power: 300 watts Maybe you shouldn't connect PA-Speakers to some very "simple" Amps... I believe, these speakers have a very reactive load, so you might need an amp with big current-capabilities. Your mentioned amps really cant. These are mostly cheap chipamps for a normal 8ohm-load. I believe your amps simply overheated and the shortcircuitprotection can't really protect against big inductive loads. Mike

1st May 2004, 12:03 PM	#4
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	They seem to be rated at 8ohms, but maybe you should measure their DC-resistance with a normal multimeter. I think you should measure at least ~5ohms.

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