Al Griffin

Will your next TV be wire-free? To judge from the sets on display at this year's CES, models that wirelessly pull in programs using the Wi-Fi standard are the next hot thing in TV tech. Most of the Wi-Fi-enabled sets here, including models from Sony, Sharp, and Philips, are LCD TVs in the 12- to 23-inch size range.

Q I am looking to buy a Pioneer Elite AV receiver, but I hear that they have problems with 4K/Ultra HD video passthrough. Is this correct? —Charlie F. / via e-mail

Q I own a Marantz SR6013 A/V receiver and use it for both video switching and audio amplification. For video, I mostly watch Ultra HD Blu-ray discs. For music, I mostly stream from the Tidal service using the Marantz receiver’s built-in HEOS app. I would like to buy an external digital-to-analog converter (DAC) that supports MQA but am confused about the connections and the control app. After checking out my Marantz AVR’s back panel, I see two coaxial and optical digital inputs, but no digital outputs to connect the DAC, so maybe using an external DAC with the AVR is not possible. Am I missing something? —Rod McClaskey, via email