Some users have reported humming with their amp.
Here is what you can do to get rid of it:
1. Update your amp with the latest firmware.
You ‘ll find the complete procedure here below in attachments
2. Try to adjust the settings of the Noise Gate pedal in the Spark app:
3. If above steps haven’t changed anything, you may have a grounding issue. The power supply provided with the amp is not grounded. In this case, contact Positive Grid Support for a replacement power supply.
You can also find some spare power supplies on the Internet.
Some users have reported using laptop grounded power supplies or having plugged their amp to a computer with USB to get rid of the hum.
If you’re interested to know more about Noise gates, i also suggest you to look at these resources :
EDIT (2020-12-18) : Some member have reported receiving grounded power supply with their amp. it looks like PG is now including them by default. If you still receive a 2 prong plug and have hum, please get in touch with PG (see procedure above)