I see that this allows for 1 source to be distributed to 2 sets of speakers, but can it connect 2 sources to one pair of speakers. If so, are there instructions on how to do so?

The quick, safe answer is "no". The reason is that the unit contains 2 switches, labeled A & B. Switch A is designed to connect the L+/R+ lines of the Source to L+/R+ of Speaker A. Likewise, Switch B connects L+/R+ lines of the Source to L+/R+ of Speaker B. Now, L-/R- of the Source are ALWAYS connected to L-/R- of BOTH speakers A & B at all times. In other words, L-/R- do not run through either Switch A or B (they act like a common line for all components). This design is a bit unfortunate because the switches they chose have plenty of contacts to accomodate and isolate all parts. So, as it stands, if you were to connect two sources to what is now labeled Speaker A & B and connect a single set of speakers to what is now labeled Source, the L-/R- of both sources (amplifiers) would be connected together at all times. If you were cautious and made sure that only one amps was turned on at a time, you still could never be sure that the powered off amp is not loading down the powered on amp. You may end up accidentally ruining both amps. In conclusion, it is not worth the risk. So, you have two choices for accomplishing your goal: (1) buy a switch designed for 2 sources, 1 output or (2) buy this switch, open it up and reconfigure it for 2 sources, 1 output. This second option of course relies on your electrical skills with a soldering iron and an Exacto knife.

Can it be used with 12 gauge speaker wire?

Should work with 12 wire if you can connect that wire to the contact posts at the switch. If its braided 12 strip a few strands to make the connection. Ps. 12 really is overkill ie. 18 would be more than heavy enoug

Can this switch shut off both sets of speakers at the same time so there is no sound from either set?

Yes it can.. If both switches are pushed in, both sets of speakers are working. Push one out, turns that one off, push both out they both shut off. Works great.

ASIN	B007JV6F34
Actuator Type	Push Button
Best Sellers Rank	#234 in Audio & Video Selector Boxes
Brand	Pyle
Brand Name	Pyle
Circuit Type	1-way
Color	White
Connectivity Protocol	USB
Connector Type	Block
Contact Material	Brass
Contact Type	Normally Closed
Control Method	Touch
Controller Type	Push Button
Current Rating	2.5 Amps
Customer Reviews	4.3 out of 5 stars 611 Reviews
Global Trade Identification Number	00068889016550
International Protection Rating	IP67
Item Dimensions	2.25 x 3 x 5 inches
Item Height	5 inches
Item Type Name	In Wall Speaker Selector Switch - Home Audio 2-Channel A/B Dual Channel Speakers Controller Pod Box - Control and Activates (2) Pair of Indoor or Outdoor Speakers - Pyle PVCS2
Item Weight	0.34 Pounds
Lower Temperature Rating	100.12 Degrees Fahrenheit
Manufacturer	Sound Around
Material Type	Brass
Model	PVCS2
Mounting Type	Wall Mount
Number of Items	1
Number of Positions	7
Operating Voltage	120 Volts
Operation Mode	manual
Specification Met	UL
Switch Type	Push Button
Terminal	Screw
UPC	804067192254 863190005633 531479601080 808113091362 794177099683 068889016550 809394271986
Unit Count	72.0 Count
Upper Temperature Rating	100.12 Degrees Fahrenheit
Warranty Description	One Year Limited
Wattage	120 watts

Pyle in Wall Speaker Selector Switch - Home Audio 2-Channel A/B Dual Channel Speakers Controller Pod Box - Control and Activates (2) Pair of Indoor or Outdoor Speakers PVCS2 White

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