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Q Bluesound’s Node streamer has a built-in DAC and costs around $500. Meanwhile, Lumin, Linn, and Naim sell streamers without built-in DACs for over $2,000 or $3,000. What do these more expensive streamers do to the signal that justifies the extra expense? And if the digital output from these pricier streamers is of higher “quality,” can a high-quality DAC compensate for a lower-priced streamer with a “lower quality” output? — Reginald Tinsley

Across a career now spanning 40 years (if we use the version of his résumé that lists The Terminator as his debut), James Cameron has proven himself as one of our most popular filmmakers. His oeuvre totals fewer than 10 movies, yet they have been much-appreciated mdash; including two that were top box office champs — so newer, superior disc releases are seemingly forever at the top of fans’ wishlists. Fox/Disney recently sent us a trio of long-demanded Cameron films in so-called Ultimate Collector’s Editions, available for the first time on 4K disc: Aliens, The Abyss, and True Lies. Let’s explore them in the order of their theatrical release.