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Post by nathanzachary on Jul 23, 2015 14:44:24 GMT -5
I noticed after watching a ~3 hour film last evening that both my XPA-1s and my XPA-3 were quite hot. The XPA-1s were much hotter than the XPA-3, and one of the XPA-1s more than the other. Also, two of the amps had a high-pitched sound for quite some time after turning them off (primarily coming from the hotter XPA-1). I would think that these things are somewhat normal given the power of the amps, but I haven't noticed them before. Anyone else experience these symptoms? The one XPA-1 is the same amp that I mentioned in this thread ( emotivalounge.proboards.com/thread/39455/xpa-1-gen-2-clicking ) that makes a clicking noise. |
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jlamo
Sensei
Its a good day!
Posts: 192
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Post by jlamo on Jul 23, 2015 16:06:13 GMT -5
I'm not sure if the high pitched noise is the same as this but my brother had a xpa 5 g2 that when powered down in standby mode it caused a loud high pitch noise in the room that only the wife and kids could hear but he couldn't and after a few days of hearing it the kid asked about it and further investigation with emotive , they said something about the amp oscillating (whatever that means) and sent it back to get repaired.
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Post by repeetavx on Jul 23, 2015 16:17:01 GMT -5
Parasitic oscillations. If a componant, or two, drift out of their designated range, an amplifier can turn itself into an oscillator. When this happens, it will consume more power than usual. A high, almost ultrasonic tone would be a symptom to watch out for.
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Post by audiobill on Jul 23, 2015 17:24:29 GMT -5
Another interesting dimension is that in warmer weather, there is reduced heat transfer from an amp to surrounding air.
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Post by nathanzachary on Jul 24, 2015 11:26:33 GMT -5
I'm not sure if the high pitched noise is the same as this but my brother had a xpa 5 g2 that when powered down in standby mode it caused a loud high pitch noise in the room that only the wife and kids could hear but he couldn't and after a few days of hearing it the kid asked about it and further investigation with emotive , they said something about the amp oscillating (whatever that means) and sent it back to get repaired. This is exactly what it is! Maybe I should contact Emotiva about it? |
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Post by lynnmass603 on Jul 24, 2015 11:41:59 GMT -5
the high pitch noise is coming from the 5v supply and will not cause any damage can only be heard in stand by
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