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purchased over-the-counter or delivered and installed by an authorized mcintosh ... dealer mcintosh products that are purchased over the internet by phone or ... mail order are presumed to be used and do not qualify for any mcintosh ... warranty mcintosh does not warrant in any way products that are purchased from ... anyone who is not an authorized dealer or products that have had their ... serial number altered or defaced ma6900 integrated amplifier ... 5 band equalizer great for touching up an old recording or taming the acoustics ... of a problem room flexibility one set of ... balanced inputs main preamp-out/amp-in connection and two additional switched ...