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The Sony ALT-SA31iR is a wireless music system developped by Sony for the iPod.

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Pros

built in FM tuner with 20 presets

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designed for multi-room usage

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can be expanded up to 8 S-AIR enabled speakers

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wireless speakers

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able to transmit different source material to different wireless stations - eg/ iPod music to one station while radio to the other

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Cons

exorbitant price

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multiple remotes are easy to misplace, confuse

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small 2 1/4" drivers

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cheap looking

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no support for their own Walkman line of MP3 players

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The Sony ALT-SA31iR is a wireless music system developped by Sony for the iPod.  The system includes an iPod/iPhone dock, two wireless speaker sets with remotes and a AIR-RM10 remote commander. Simply plug in an iPod or iPhone into the dock to automatically charge it and enjoy music through the two high-output wireless speakers with dual 57mm mica speakers. It capable of playing two seperate music sources and the system can be expanded to use up to 8 S-AIR enabled speakers for music enjoyment in multiple rooms in your house. The fluorescent display shows unit functions and displays song information such as artist, title and album. The included wireless remote gives control of the primary unit functions and has an LCD display to view song data.

Specifications
  • Amplifier:
    • Function:
      • Tuner : Yes
      • iPod1 : Yes
    • Power:
      • Output Power : 8W x 2
      • Power Output - Front (RMS 10%THD) : 7W x 2
    • Audio:
      • Equalizer : Yes - DSP Edit/ EQ Edit
      • Inputs and Outputs
      • Audio Line IN : Yes
  • Tuner:
    • Capability : FM Tuner, iPod1 (sold separately)
    • Audio:
      • Station Preset(s) : 20 FM
      • Tuner Frequency Range : FM: 87.5 - 108.0 MHz
      • Tuner Type : FM
    • Power Requirements : 120V AC, 60Hz
    • Audio:
      • Antenna System : Module (EZW-RT10A)
      • Format(s) Supported : S-AIR Specification version 1.0, Modulation method - DSSS, 16bit / 48kHz Linear PCM, Data Transfer Rate: 11Mbps. (Max)
      • Frequency Range : 2400MHz - 2483.5MHz
      • Impedance : 8 ohms
  • Weights and Measurements:
    • Dimensions (Approx.) : AIR-SA50R: 9.8 x 4.8 x 5 in. AIR-SA17Ti: 11 5/8 × 1 3/4 × 4 3/8 in AIR-RM10:
    • Weight (Approx.) : AIR-SA50R: 13.4 oz., AIR-SA17Ti: 2 lb. 6.8 oz., AIR-RM10: 4.6 oz.
    • Component Compatible : AIR-SA50R, AIR-SA17Ti, AIR-PC10T
  • Hardware:
    • Display : 1 line LCD Display
    • Remote Control : AIR-RM10
  • Inputs and Outputs:
    • Analog Audio Output(s) : RCA x 1pr
    • Antenna Terminal (FM 75 Ohm) : External antenna
    • Composite Video Output(s) : Yes
  • Front Speaker:
    • Speaker System : Full range, bass-reflex
    • Speaker Type : 57mm, mica type (2)
    • Impedance : 8 ohms 
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