Speaker Protection Problem

danbaxtr · 15th February 2011, 04:17 PM

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

ajazz · 15th February 2011, 05:04 PM

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.

ajazz · 15th February 2011, 05:07 PM

or may be one of your speakers coil is about get short (burn out), hence the temporary low impedance

danbaxtr · 15th February 2011, 05:13 PM

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?

planet10 · 15th February 2011, 05:20 PM

Sounds to me like a problem with the loudspeaker.

dave

danbaxtr · 15th February 2011, 05:39 PM

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?

Mooly · 15th February 2011, 06:07 PM

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

danbaxtr · 15th February 2011, 06:08 PM

Yes, if I switch the cable the other channel will trip with the same speaker.

planet10 · 15th February 2011, 06:14 PM

Speakers, speaker cable, or connections.

dave

danbaxtr · 15th February 2011, 06:15 PM

Tried different cables, same problem. I also turned off the built in subwoofer on the strata minis.

15th February 2011, 04:17 PM	#1
danbaxtr diyAudio Member Join Date: Feb 2011	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

15th February 2011, 05:20 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Sounds to me like a problem with the loudspeaker. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

15th February 2011, 06:07 PM	#7
Mooly diyAudio Member Join Date: Sep 2007	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 __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

15th February 2011, 06:14 PM	#9
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Speakers, speaker cable, or connections. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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15th February 2011, 05:04 PM	#2
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	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.

15th February 2011, 05:07 PM	#3
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	or may be one of your speakers coil is about get short (burn out), hence the temporary low impedance

15th February 2011, 05:13 PM	#4
danbaxtr diyAudio Member Join Date: Feb 2011	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?

15th February 2011, 05:39 PM	#6
danbaxtr diyAudio Member Join Date: Feb 2011	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?

15th February 2011, 06:08 PM	#8
danbaxtr diyAudio Member Join Date: Feb 2011	Yes, if I switch the cable the other channel will trip with the same speaker.

15th February 2011, 06:15 PM	#10
danbaxtr diyAudio Member Join Date: Feb 2011	Tried different cables, same problem. I also turned off the built in subwoofer on the strata minis.

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