March 24 | Kari Nevalainen   A loudspeaker can be “sophisticated” by featuring highly complex and unusual techniques, or simply by being elegant and expert in matters of culture. ProAc Response D20R sports a new ribbon tweeter, modern carbon fiber mid-woofer and of course, ProAc’s trademark: the meticulously executed crossover. But I’d not call this speaker sophisticated by its technical merits. When you look at the D20R it bears striking resemblance with ProAc speakers from two

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