bad hum with Minitaur

BostonGeo · Post by **BostonGeo** » Fri Oct 19, 2012 11:48 am

Love my Minitaur, but it has a serious ground(?) issue that goes away when I have it connected to the computer through the usb cable. This is a problem becauser I want to be able to use it with the DIN midi only for gigs, but the hum is huge. Anyone else encounter this, and is there a workaround? Thanks -George

tzx426 · Post by **tzx426** » Sat Oct 20, 2012 12:20 pm

I have the opposite: I'm hearing a hum when the minitaur is connected to my Mac by USB. It stops when I disconnect USB. The keyboard is connected by the midi din connection. Other than the hum, I love the minitaur.

Scott

monodream · Post by **monodream** » Tue Oct 23, 2012 6:28 am

+ 1 to bad hum when attached to computer via USB (W7)

citric_acid · Post by **citric_acid** » Tue Oct 23, 2012 1:20 pm

same here. can t use it both together. is a no go for recording by using the editor or usb.....

cyclops · Post by **cyclops** » Wed Oct 24, 2012 6:40 am

same here, i disconnect USB when im recording, plug it back in to save a preset or to adjust under the hood settings,

citric_acid · Post by **citric_acid** » Wed Oct 24, 2012 9:44 am

yes but if you use the cv & Gate 2 Midi function you need both !!!

citric_acid · Post by **citric_acid** » Thu Nov 15, 2012 3:34 pm

i got a information to use this usb isolator to reduce the hum. it's not cheap but a god idea to reduce the hum and noises

http://www.electronics-shop.dk/?id=1038&currency=EUR

nectarios · Post by **nectarios** » Sat Nov 17, 2012 11:50 am

+1 on hum on my Mac when the USB is connected.
I love its sound but 590€ and this kind of noize when the USB is connected?...someone's being lazy...

till · Post by **till** » Sun Nov 18, 2012 7:02 am

nectarios wrote:...someone's being lazy...

The USB specs were done without keeping audio and ground loops in mind. The MIDI specs were always suing optical isolated connections. So no ground loop is possible there by default. USB connects the shield of the cable to ground on both ends. And this is the bad part here. A ground free USB connection is all it takes. This can be done by using special adapters with passive or with active (read: wall wart needed) dongle like USB devices in between the connection.
I think (not 100% sure) that doing a ground free socket on the Minitaur (this would help), would be against the USB specs. Many other synth companies of USB equipped synths have the very same problem.

citric_acid · Post by **citric_acid** » Thu Dec 13, 2012 10:46 am

i conected my mt now direct on one of my usb ports on my imac and the hum is gone away. so i think if you have noises for eg on an hub, try one of the direct ports of your pc or mac. hope this helps.

citric_acid · Post by **citric_acid** » Mon Jan 14, 2013 7:45 am

this usb isolator fix the bad hum problem....

http://www.ebay.de/itm/160945797756?_tr ... _500wt_922

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