Al Griffin

Q How would I go about setting up multiple surround speakers in the same channel—two side left and two side right speakers, for example—as in a commercial movie theater? One more question: If I used a Y splitter and additional amplifiers to power the speakers, could I still employ Audyssey processing to calibrate the speakers? I am planning to build a home theater with two to three rows of seating. —William Lee / via e-mail

Q I have read that the electrolytic capacitors in audio equipment can degrade and leak after years of use and that sound quality will suffer as a result. Is this true? I have a few pieces of 25-to-30-year-old gear that still sound fine to me. I’ve also read that upgrading capacitors can improve sound quality. Is that another myth? —Rob Gerry / via e-mail

Q My girlfriend and I want to watch movies and listen to music late at night without waking up everyone else in the house. Here are my questions: Is there is a proper way to drive two pairs of headphones from the same amplifier without degrading the signal? Is it as easy as using a jack splitter? We care about great sound, so I'm planning to use HifiMAN, Audeze or Oppo open back headphones, but I'm wondering if I can get away with using only one amp (either a dedicated headphone amp or my home theater receiver). —Raphaël Rainville / Montreal, QC, Canada

Q I’ve been bouncing around the idea of upgrading my current gear and going digital because my wife and I want the convenience of being able to cue up any piece of music using our iPhones.