USB Hub

Hi,

When I am connecting a pair of XDJ's in HID and a NI X1 or Novation Dicer, do I need a powered usb hub?

As the XDJ's are not usb powered, the only drain would be from X1 or the Dicers - does have the powered any benefit? (I doubt...)

Does the same applies even when using as the XDJ's as the aggregated sound device to RB DJ? - will the unpowered hub make it? (I guess it will)

Thanks!