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SONOS Amp going into fault mode

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I have had the Amp since mid January. Been mostly playing through outdoor 6 ohm speakers so, to respect neighbours, have not put the volume up too high. Yesterday I acquired some Dali Oberon 5 speakers for indoors. These are 6 ohm speakers also. I have connected all for speakers to the Amp though a simple 2 way switch and have NOT played both pair together. Twice with big sound tracks when the volume gets to about 60% the Amp goes into fault mode. As I have read that Sonos amp can happily drive a pair of 6 ohm speakers I am assuming it has nothing to do with mismatching impedance. How do I rectify this issue.

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K

KumarAnswer

Also possible is that you are simply pushing the output too far.

Seeing as the OP says volume has never been pushed beyond 60%, I can't see the quoted being the case.

Two possibilities: A wiring defect caused issue for which the troubleshooting suggested in the preceding post is all relevant.

The other less probable reason can be a defective amp.

The switch may be defective too. Wire just the Dali to the amp directly removing the switch and the outdoor speakers from the frame for testing the switch by elimination. Dali are amp friendly speakers, and if the problem goes away, the switch is the culprit. I would do this as the first trouble shooting step to be taken. While connecting the Dali, you can easily ensure that all wire connections are good and not possible cause for shorting.

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Luscombe4140Author

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And the recommendation to not use other than 8 ohm speakers ? Should this be a issue ? Running all 4 speakers together is nota deal breaker and wouldn’t occur more than a few times a year.

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K

Kumar

I would not worry about that as far as the Dali are concerned. And as long as the rated impedance of the other pair is not less that 8 ohms, that is also not an issue. If it is less than 8, and you don’t have the Sonos Amp at more than 70%ish volume levels when using them, it should still not be an issue.

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Luscombe4140Author

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Thank you again for all your assistance. Having either of the speaker pairs at 70% is highly unlikely but I will follow your adivice and ensure that they are not pushed beyond that level.

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Ken_Griffiths

Thank you again for all your assistance. Having either of the speaker pairs at 70% is highly unlikely but I will follow your adivice and ensure that they are not pushed beyond that level.

Just to quickly mention (in case you were not aware) you can set the Amp to not ever go beyond a set volume using its volume limiter. See this link:

https://support.sonos.com/s/article/3118

It will ensure no-one else in the home can set its volume above your chosen maximum level.

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Luscombe4140Author

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Thanks Ken. Not a high risk, just me and my good lady. But i will set it when my son visits.

Thanks you.

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K

Kumar

The volume limiter is one of the neat features in Sonos. Easy to set. Remember that the slider still has the full range of motion but 100% will then actually mean 70% if that is the volume limit set for the unit. Easy to test running just one pair of speakers, to see if the 70% provides adequate sound levels using the full range of motion for the slider.

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Luscombe4140Author

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Thanks Kumar

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