Instruction: Answer the given question using the supporting document.

Input:
Question: Would this still be necassary if I'm only using the 2nd zone output from the av reciever to power 2 spkrs in another room with a remote volume control
Document: I was a little concerned that connecting three sets of speakers would result in a massive loss of volume or sound quality. I have this connected to two pairs of ceiling speakers in the house and one pair outside. The sound is great regardless of which pair of speakers and I noticed no massive loss of power. Each pair still puts out a lot of volume.
This will minimize the diminution of volume from splitting the power from your amplifier from a single set of posts to several sets of speakers. The box (SS4) will take care of protecting your amplifier. I like this piece of equipment for it's essential protection functions, ability to turn on/off speakers on a room to room basis, its' ability to provide sound to multiple rooms from an AVR that does not have that capability, and finally its' cost which is exceptional.
Works great so far, I used it to connect the Zone 2 output of my Onkyo 605 to 2 sets of speakers in my new apartment that are in the ceilings. I was worried out the impedence being correct and overloading the amp and this takes care of it. Nice solid metal box, well built and good value. May use  one of the 2 remaining outputs to run some speakers on the patio in the summer.
I am using this with a small stereo, and I have 3 sets of speakers hooked up to it: family room and two separate patios. Works great, and the included label stickers eliminate guessing which speakers are on. Highly recommended, good quality.
The SS4 Speaker selector arrived quickly and without issues, looked and performed as expected. Easy to set-up and use. For the price, an excellent item - would recommend this item.
It replaced a Radio Shack model with contacts that got intermittent with age. Use it to select garage, pool, or living room or all three.
This item works exactly as advertised and the really nice thing is you have the capability to have multiple rooms play at once if you so chose like your living room and outside patio for instance.
I got this to control speakers I put in my ceiling to play our Serius Radio thought the house. But wanted to be able to turn some of them off when listening to something else or watching TV. It words great.
Wasn't sure how this was going to turn out - and I looked at a number of different speaker selectors on Amazon. Product arrived on time, looks good and unobtrusive, and hooked everything up very easily. Remember you will need some speaker wire to hook up this unit to your receiver. Works great, and sound quality is great, which I was worried about. I would buy this product again in a heartbeat.
However, if you simply tap into the speaker posts on your receiver, you are likely to fry your expensive receiver by not matching the impedance of the speakers which you are trying to power. Add a jumper set of wires from the receiver to this selector and you will be able to run up to 4 additional pair of speakers throughout your house without having to buy a separate amplifier. You should use the largest gauge wire for the jumpers possible - usually 12G or 14G.
Answer: I don't think so.  You'd use the switch if you wanted to selectively drive 2 PAIRS of speakers from the 2nd zone. The switch would allow you to drive Pair A or Pair B or A+B.