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Old 15th February 2011, 05:17 PM   #1
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Default Speaker Protection Problem

I have an Onix Strata Mini speaker that is causing my NAD M3 amp to go into amp protection at high volumes. What would normally cause an amp to go into projection? The amp worked fine for years with these speakers. I've checked all the cables and connections. It is definitely being caused by my right speaker. Any suggestions would be a huge help.

Thanks,
Dan
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Old 15th February 2011, 06:04 PM   #2
ajazz is offline ajazz  India
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Normally every Amp has Over Current Protect to safe guard its output transistors. Just connect speakers of higher impedance than the present one and your Amp won't go into protect mode on high volumes.
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Old 15th February 2011, 06:07 PM   #3
ajazz is offline ajazz  India
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or may be one of your speakers coil is about get short (burn out), hence the temporary low impedance
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Old 15th February 2011, 06:13 PM   #4
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The NAD M3 does not have an impedance setting or higher impedance input. It goes into protection on louder passages usually drums. Maybe the speaker coil on the bass driver is the culprit?
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Old 15th February 2011, 06:20 PM   #5
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Sounds to me like a problem with the loudspeaker.

dave
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Old 15th February 2011, 06:39 PM   #6
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Bummer, AV123 is out of business. I believe they used Atohm drivers in those speakers. Could a problem with the crossover also cause this problem? Is there anyway for me to test for low impedance?
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Old 15th February 2011, 07:07 PM   #7
Mooly is online now Mooly  United Kingdom
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Does the suspect speaker trip the other channel in the amp ?

Yes you can measure impedance if you have a meter that reads RMS voltage over a wide frequency range and a signal generator. Check my figures first...
Testing a speaker's impedence
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Old 15th February 2011, 07:08 PM   #8
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Yes, if I switch the cable the other channel will trip with the same speaker.
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Old 15th February 2011, 07:14 PM   #9
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Speakers, speaker cable, or connections.

dave
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Old 15th February 2011, 07:15 PM   #10
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Tried different cables, same problem. I also turned off the built in subwoofer on the strata minis.
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