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The S-31B-LR-K is a two-way bookshelf speaker set from Pioneer that is a part of the company's Series 3 product line.

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Pros

bass range is well defined, not muffled

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clean sound for classical music

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built quality is solid, can handle a fair amount of abuse without a problem

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fairly small footprint for the amount of power output

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Cons

needs a subwoofer for deep low-ends that won't be produced here

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volume is mismatched from other comparable speakers, may need to be individually adjusted in a 5.1 setup if other brands are used

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physical design is average, may seem a little "unfinished" to some

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The S-31B-LR-K is a two-way bookshelf speaker set from Pioneer that is a part of the company's Series 3 product line. Utilizing a compact design that enables discrete placement virtually anywhere in a room, this model features a curved cabinet shaping in effort to decrease standing wave interference for optimal sound clarity. Flush-mounted speaker grills provide an aesthetically pleasing face to the unit, and also protect the 4-inch glass cone subwoofer and 1-inch dome tweeter drivers. Two of Pioneers own technologies are included in the S-31B-LR-K, including ABD (Acoustic Balance Drive) for a consistent balance of low, middle and high frequencies, and AFAST (Acoustical Filter Assisted Sound Tuning) for self-adjusting output levels that are dependent on the acoustic properties of a given room. In addition to the speakers functioning as a standalone unit, users may purchase an optional telescoping stand for home theater-style applications. 

Features
  • Matte Black wood grain aesthetic
  • Light, compact design
  • 120 watts power handling
  • 4-inch glass cone subwoofer
  • 1-inch soft dome tweeter
  • Curved cabinet design
  • Flush-mounted speaker grills
  • Acoustic Balance Drive technology
  • Acoustical Filter Assisted Sound Tuning  
  • Optional telescoping stand available
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