Ask S&V

Q I’m considering buying a home where the builder has options for structured wiring. The markup on this option seems a little high (a few hundred dollars to go from 16-gauge to 12-gauge speaker wire, etc.). I know the best time to run wire is during the construction process, but what is the best way to accomplish it: builder, custom installer, or DIY? One major concern is that the exterior walls will have spray-foam insulation, so once that’s in, I’m thinking those walls are hands-off.—Mike Sellers / Tomball, TX

Q I have a Yamaha stereo receiver and would like to connect a Polk active sub to the “B” speaker jacks while powering a pair of Polk speakers from the “A” speaker jacks. Will this work, or must I instead connect the speakers to the line out on the sub? Which connection will give me the best result without causing damage to the amp? — Alex Parkes, via email

Q I have an existing housewide audio system with a receiver connected to a speaker selector and speakers and volume controls in four rooms. The bass isn’t very good, and I’d like to improve it. How can I add a subwoofer to my housewide audio system? — Don Hamilton

Q I want to get the highest possible audio quality from my home theater system when using the streaming apps on my new Samsung QN90A Neo QLED 4K smart TV. Is the TV’s eARC port compatible with my Denon receiver’s ARC port? By compatible, I mean will the Denon “understand” the Dolby Digital Plus bitstream coming from the apps and just ignore any Atmos metadata? —George Perkins / Madison, WI

Q I’m confused by the volume display on my AV receiver. There are two settings to choose from, Relative and Absolute. What’s the difference, and what do they mean? —Scott Oakley / via e-mail

Q In a picture accompanying S&V’s recent article on VIZIO’s Reference UHDTV, I noticed a coaxial cable input on the back panel next to the HDMI connections.  This made me wonder why coaxial cable is used to convey over-the-air and cable HD signals, but HDMI connections are used to carry them the last six feet to our screens. Is the issue copy protection in the HDMI cable?  Or is it about compression/decompression? —Ben Hurwitz / Greensboro, NC