Yes, the output of the W3 works great with headphones and you can control the volume with the TV remote.

No, the W3 Sender will transmit USB audio directly to the Receiver so there's no need to connect to the headphone output on your computer.

Sure, as long as your amplifier, preamp, or receiver has RCA preamp outputs you can connect the W3 to send wireless music over to your A2 powered speakers. Very cool!

Yes, you can use multiple W3 sets (up to 8) to send stereo audio to different locations or up to 3 receivers with one sender unit.

Two W3s can be used on one computer if you have two free USB ports. You would need to change the selection in your computer's audio preferences to switch between each Sender. Also, make sure to leave at least 6 inches between the units so there is no interference.

Yes!  As long as it can provide at least 250mA, any USB power supply or smartphone / tablet charger should work just fine to power the W3 Sender or Receiver.

If you car has an auxiliary input on your car's stereo system (either 1/8" or RCA), then simply connect the W3 Receiver to a USB car power adapter and the audio output from the W3 Receiver to the audio input on your stereo system.

We considered adding batteries but decided not to as this was primarily designed as a wireless connection from your stereo receiver to a subwoofer or from a laptop to your stereo or powered speakers. There are, however, 3rd-party battery packs available and a quick Google search will turn up some inexpensive options that work great!

We agonized whether or not to include 2 chargers in the box but figured that most people these days are very likely to have an extra USB charger or two from an old smartphone or tablet. These power supplies are inexpensive and can be found at your local Radio Shack or electronics store. We also have extra USB adapters available through our web store - http://audioengineusa.com/USB-Power-Adapter.

The W3 latency is under 20ms so it's perfect for using with video - home theater surround or basic 2-channel audio. Can I use the W3 for my podcasting studio? I want a wireless mic to my computer's audio input? Sure, this is a great application for the W3. You can use the W3 to replace any RCA or mini-jack cable, with or without a computer!

The features that we feel make our system better than most wireless products currently on the market are the overall ease of setup, fixed low latency, audio quality, lack of dropouts, and high interference tolerance - all the good stuff that's important for a wireless product to be of any real use.

The full frequency response is 15Hz to 22KHz, +/- 1.5db. The numbers shown in the W3 Setup Guide are measurement points and not related to the overall bandwidth of the system. There's not need to show a spec for frequency range as the system transmits uncompressed PCM stereo audio (CD-quality) over using a protocol specifically designed for audio.

The W3 can transmit to up to 3 receivers simultaneously.