This is a four channel resistance mixer. Four mono inputs are combined to one mono output. There is a volume control for each input as well as a master volume control.

The circuit is completely passive and requires no power. It is housed in a rugged raw aluminum die cast case.

The design is quite versatile and can also be used in reverse as a 4-way splitter. Also the knobs can be pulled off and reorientated effectively moving the inputs to the back or side depending on what works best for your setup.

8-Channel version also available.

Shipping to the US is a flat $10, everywhere else is $22 for the first item and $8 for each additional item.

I am away right now. All orders will ship on April 28th. My apologies for the wait.