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SWR-2755B Audio Switchers

Expanding the channel input and output capabilities of two-channel analyzers

Audio Precision offers three models of the SWR-2755B audio switchers, which expand the input and output capabilities of Audio Precision two-channel audio analyzers, including the APx555, APx525, and 2700 series. (Also compatible with ATS-2, System Two and System One instruments.)

SWR-2755B switchers replace both the SWR-2755 and SWR-2122 switcher product series, each of which has been discontinued. The B Series SWR-2755 switchers are entirely compatible with our current analyzers and offer better performance at a lower price. The SWR-2755B may be used interchangeably with SWR-2755 legacy switchers. They also may be used with any discontinued analyzers that originally specified the SWR-2122 or SWR-122 switchers.

Built with the same feature set and solid integrity of the SWR-2122, the SWR-2755B series bring significantly lower crosstalk (18 dB better in an unbalanced 600 Ω load; 10 dB better in a balanced 600 Ω load), a universal power supply that automatically adjusts to all line voltages, a convenient rear-panel ground lug and full EMC and safety regulatory compliance.

NOTE: SWR-2755B Series switchers are the successor platform to Audio Precision’s original SWR-2755 switcher products, which are now officially on Depleted Supply Status. Audio Precision continues to offer Service for the original SWR-2755 products. Please see Services & Calibration for additional information.

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Features

  • Input and output configurations enable switching of generator outputs or analyzer inputs, or both.
  • Balanced and unbalanced configurations are available.
  • LEDs indicate the on or off status of each channel.
  • Multiple switchers can be connected to an Audio Precision analyzer, expanding the system capability to as many as 192 inputs and outputs.
  • Low inter-channel crosstalk, less than –150 dB at 20 kHz in the balanced configurations.
  • All switchers are one rack unit (RU) high (1.75″). Switchers can be used on the bench or rack mounted with an optional rack mount adapter kit.

NOTE: Use of any SWR-2755B Switcher with APx500 Series audio analyzers requires an APIB adapter (USB, PCI or PCMCIA).

Options

SWR-2755B-M Output Switcher

  • 12 X 2 configuration
  • Can route either of the two generator output channels (A & B) to any of 12 channels
  • Up to 16 units can be cascaded to allow up to 192 channels to be accessed
  • XLR connectors for balanced signals or, using adapters, unbalanced signals
  • Complement mode allows all but one channel to be driven while measuring the undriven channel for worse case crosstalk on multichannel devices

SWR-2755B-U Unbalanced Switcher

  • 12 x 2 configuration
  • Can be used as either an input or output switcher (by dip switch on rear panel)
  • Up to 16 units can be cascaded to allow up to 192 channels to be accessed
  • Floating BNC connectors for unbalanced signals prevent ground loops

SWR-2755B-F Input Switcher

  • 12 X 2 configuration
  • Can route either of the two analyzer input channels (A & B) from any of the 12 channels
  • Up to 16 units can be cascaded to allow up to 192 channels to be accessed
  • XLR connectors for balanced signals or, using adapters, unbalanced signals

Specifications & Requirements

ELECTRICAL CHARACTERISTICS

  • Max Voltage Rating
    42.4 Vpk, 30 Vrms
  • Max Signal Power
    5 W or 200 mA
  • Crosstalk
    Balanced 600 ohm load
    –151 dB @ 20 kHz
    –140 dB @ 100 kHz
    Unbalanced 600 ohm load
    –140 dB @ 20 kHz
    –128 dB @ 100 kHz
  • Series Resistance
    Typically <0.3 Ω per side
  • Shunt Capacitance
    Typically <100 pF, from signal path to chassis (100 nF from BNC shell to chassis on U versions)
  • Reverse Termination
    604 Ω, 250 mW maximum

REGULATORY COMPLIANCE

  •  EMC complies with FCC Part 15 Subpart J (class B), 89/336/EEC, 92/31/EEC, and 93/68/EEC, EN 50081-1 (1992) Emissions Class B, EN-50082-1 (1992) Immunity.
  • Safety complies with 73/23/EEC, 93/68/EEC, EN6010-1 (1903)— IEC 1010-1 (1990) + Amendment 1 (1992) + Amendment 2 (1995).
  • Installation category II—Pollution Degree 2.

GENERAL CHARACTERISTICS

  • Power Requirements
    Universal 100–240 VAC, 50-60 Hz
  • Temperature Range
    Operating 0°C to +45°C
    Storage –40°C to +75°C
  • Humidity
    0% to 90%, (non-condensing)
  • Dimensions
    16.8 x 1.75 x 10.5 inches [42.6 x 4.4 x 26.7 cm]
  • Weight
    9.0 Ibs [4.1 kg]

Downloads

file_download SWR-2755 Switcher User Manual
file_download SWR-2755 Datasheet