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

ASIN	B079C8YN82
Audio Input	XLR
Brand	Mackie
Brand Name	Mackie
Compatible Devices	Personal Computer, Amplifier, Speaker, Headphone, Laptop, Gaming Console, Microphone, Smartphone, Tablet
Compatible devices	Personal Computer, Amplifier, Speaker, Headphone, Laptop, Gaming Console, Microphone, Smartphone, Tablet Compatible devices Personal Computer, Amplifier, Speaker, Headphone, Laptop, Gaming Console, Microphone, Smartphone, Tablet See more
Connectivity Technology	XLR
Connectivity technology	XLR
Country of Origin	China
Customer Reviews	4.8 out of 5 stars 461 Reviews
Global Trade Identification Number	00663961053999
Included Components	UNITS
Item Dimensions D x W x H	4D x 8W x 4H centimeters
Item Type Name	Passive Direct Box
Item Weight	0.9 Pounds
Item height	1.5 inches
Item weight	0.9 Pounds
Manufacturer	Mackie
Maximum Sample Rate	192 KHz
Number of Channels	2
Number of channels	2
Operating System	Linux, Windows, macOS
Product dimensions	4D x 8W x 4H centimeters
UPC	663961053999
Unit Count	1 Count
Warranty Description	1 year manufacturer

Stereo Passive Direct Box

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