Mark Fleischmann  |  Aug 3, 2017 Tube amps. Mono pressings. And now, 5.1? Has bedrock surround sound indeed joined the ranks of retro audio technologies? Surround receivers beyond the most entry level nearly always have more than five channels (though their uses vary), while Dolby Atmos and DTS:X have made seven (5.1.2) the new minimum system configuration. What happens when you go in the other direction? The flood of 5.1 speaker sets that I used to review

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