If by your question you mean "Are there two speakers" the answer is no. This is a device that wireless connects two speakers to a sound system, but it does not in fact contain two speakers with it.
This will work as long as you don't use banana plugs (the large barrel shaped plugs). If your wire has the thin pin-style plugs this will work. If the wires have the banana plugs you will just need to remove the banana plugs and either just use the bare wire or replace them with the thinner pin-style plug tips.
You have two options. You can buy the surround kit that has connectors that match your speakers. I've seen them on Amazon but I don't know if Best Buy sells them. The other option is to remove the connectors from the speaker cable and strip some of the plastic off the wiring so you can connect to this kit. It's your choice but I'd remove the connectors. Leave a couple inches on the connector end when you remove them in case you want to reattach later. It won't affect the sound of your speakers unless you're dealing with high quality audiophile speakers (you're not).
I have 2 units hooked up to my Denon AVR2100X receiver with no issues. One unit is for the rear surround and the other unit is used for patio speakers that are from the 2nd zone. Very easy to setup and no delay for surround sound
It could probably be that your wireless route is not dual band and is only 2.4ghz. This caused by the fact that your rocketfish system is 2.4ghz and and so is your router which can cause signal interruptions resulting in the popping sound you are hearing in your speakers.
Every part of my 5.2 system is a different brand of equipment, from just so-so to excellent. I hooked up my non-self-amplified left and right rear surround speakers with the Rocketfish wireless system. It was very easy and worked instantly right from the start. The rear surround speakers have plenty of very clean power and I have noticed no interruptions or extraneous sounds or noises. The set up was a snap. I thought I was taking a certain chance with equipment with that low a price. But no. Absolutely no delay. I can't imagine how it would not work with any reasonably good equipment.
I own this unit. I do not know what the frequency is, but I have no interference with my internet. I'm going to try the wireless sub unit next. Hope this helps. John