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Hi, I have just got my Matrix Mini-i Pro 3. When playing music, it sounds fantastic. There's one problem, however: whenever the unit is powered, including in standby mode, it emits a slight hum. What I mean by this is that there's a hum or buzz sound coming from the unit itself, not through the headphones, which have a totally silent background. It means the unit cannot be left with power in standby mode (its distracting when working) and the sound can also be heard during quiet passages of music. Is this a fault in the unit? I'd be grateful for your help.
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Hi John,
Are you able to measure the voltage of your power supply? Can you record a video and share it to me via private message (by link to cloud drive)?
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Hi Wei Cao,
Yes - I'm happy to do that. I've ordered a voltage tester from Amazon and will do and video the test later today.
Thanks very much for your help.
John
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Hi Wei Cao,
Please can you confirm you're able to access the recordings, videos and photos through the Dropbox link.
I look forward to hearing from you soon.
Thank you.
John
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Hi John.
Yes I downloaded the recordings.
A linear power supply composed by transformers has a specific input range, in theory, all toroidal transformers will have varying of humming noises during working, different transformer individules have different resonance points. But most of the time, it's not loud, with the input voltage increases, the noises also increases.
Your power voltage is obviously higher than the limit of the transformer input voltage range. (The limit of the transformer is 240V which is mentioned on our website and user manuals.) The transformer can work under this voltage, but may have a higher noise.
Hope you understand.
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Thank you, Wei Cao. I'm going to try plugging it in at work and testing the voltage there today to see if that makes any difference.
John
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Hi Wei Cao, I'm keen to get this sorted soon, so would really appreciate any ideas you have for devices that would address the voltage issue you have identified.
John
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Hi John,
Sorry for the delay.
As a electronic component, we will check whether the transformer has a correct voltage and output power. The noise from itself is not the object of consideration for this component. The transformer of mini-i Pro 3 comes from Noratel, a well-known supplier in the industry. The transformer applied to this product has also passed the inspection of Noratel.