Plus they might use a class D amplifier which can be a great noise source.
Grant KZ1W
On 9/18/2020 21:49, Jim Brown wrote:
Hi Tony,
Several years ago, W6GJB told me about his experience with a pair that
powered off of USB. The DC-DC converter was the culprit. I would expect
ANY device that powers from USB to have that sort of problem unless the
designer has taken great care to avoid it. You MIGHT be able to reduce
the noise with serious chokes on the cables. See my tutorial on Killing
RX Noise.
73, Jim K9YC
On 9/18/2020 9:10 PM, Tony wrote:
All:
Purchased a set of USB-powered PC speakers which turned out to be very
noisy on HF. The speakers are made by Mica model PB20i.
See:
https://www.amazon.com/gp/product/B07VTS62L6/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Tony - K2MO
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