What is the full frequency response of the W3 and what do the frequency numbers shown in the W3 Setup Guide mean?

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.