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![Profile picture of kleod9]()
kleod9 posted in the group Roland SH-4d Synthesizer Group
Hello all, I have an issue with my new sh-4d that I’m curious whether it’s an unique issue to my particular device or is common to others…
If I power my device to a powered USB computer hub or direct to the computer in any combination I can hear a grounding hum – the only option I’ve found that I can get the hum to disappear is to power the sh-4d with batteries or a USB power bank… which is fine, but when I’m working with the sh-4d in the studio, it would be better to power it with a constant electrical source which I have not figured out how to do without the hum which shows up in the DAW or external mixer.
In other words, the only way the sh-4d is recordable in any way is if I power the device by a battery – disconnecting it from all electrical sources in my home… btw, both my computer and the powered USB hub are running through a grounded power strip and I have other synths and an audio interface running through the USB hub or direct to iMac computer (3.5 GHz Quad-Core Intel Core i5 / 16 GB 2400 MHz DDR4) without any grounding interference type issues.
Is there a solution to this? Is it a common sh-4d issue?
I’m also waiting / anticipating an intelligent response from Roland support on this…
Anyhow, thanks for any thoughts on this… cheers!4 Comments-
![Profile picture of Alex]()
Yes it’s a common problem when powering synths from the PC USB port. I have experienced it with my Roland SH-4d and T-8, and the Uno Synth Pro. As @kpatzsc said, it’s best to power separately if you can. I’ve also seen people recommend using a USB isolator so maybe worth having a look at something like this… https://hifimediy.com/product/usb-isolator/
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![Profile picture of Alex]()
No problem! Let us know how you get on 🙂
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This is a common issue on many of Roland’s USB powered synths. AFAIK, you could try a USB isolator cable, or use a separate USB power supply like a phone charger to power the SH-4d, and use DIN MIDI instead of USB.