Can i use this for connecting the unbalanced l and r ts outputs from a drum machine into the balanced xlr inputs of two (left and right) speakers?

Yes. It is a two channel direct box. This device translates input from each 1/4" input to the associated XLR output. You could do this with stereo L/R outputs or two separate instruments entirely.

Can I run 2 Keyboards in stereo thru this?

It has two inputs and two outputs, imagine two very slim DI's attached together. So yes you can run stereo in but its going to be separate XLR outputs for L & R

Item model number	MDB-2P
Is Discontinued By Manufacturer	No
Compatible Devices	Laptop, PC
Connector	Standard Phone TS/XLR
Hardware Interface	USB
Hardware Platform	Personal Computer

MACKIE マッキーパッシブステレオダイレクトボックスMDB-2P 国内正規品

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