Here's another thing that concerns me about these little switchers. It is echoed in this thread and post by @nigel pearson about the Meanwell RS-50-24:
https://www.diyaudio.com/community/threads/jlh-10-watt-class-a-amplifier.3075/post-6202944
The XP Power, like the Meanwell, do not like either output being connected to mains earth. That includes any connection to it via signal ground in other gear. I had to float the input on the spec an to get a good measurement. Otherwise noise above the switiching freq increases dramatically. If connected near the output, the thing just screams.
https://www.diyaudio.com/community/threads/jlh-10-watt-class-a-amplifier.3075/post-6202944
The XP Power, like the Meanwell, do not like either output being connected to mains earth. That includes any connection to it via signal ground in other gear. I had to float the input on the spec an to get a good measurement. Otherwise noise above the switiching freq increases dramatically. If connected near the output, the thing just screams.
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I've started a new thread for smps noise measurements. If you got one (or more), measure it and post the noise curve.
https://www.diyaudio.com/community/threads/post-you-smps-noise-spectrum-measurements.394518/
https://www.diyaudio.com/community/threads/post-you-smps-noise-spectrum-measurements.394518/
I emailed Mean Well last week and have received no reply.
I also replaced the switcher with a Power One 15V open frame linear supply and the sound quality improved significantly.
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