DYNAMIC MICROPHONE HEADSETS SupraPlus Monaural SDS 2490 SupraPlus Binaural: Single Channel: SDS 2491 Dual Channel: SDS 2492 KEY FEATURES: Mission-critical reliability and comfort. Our dynamic-microphone headsets not only meet or exceed all specifications set by our existing world-class professional headsets, but these headsets also deliver superior all-day, every-day comfort and reliability. Dynamic noise-cancelling microphone. Noise-cancelling microphone with extended boom eliminates nearly 75% of unwanted background noise, ensuring excellent transmission clarity in busy, noisy environments. Cable and Quick Disconnect. Single-cable design with robust PU (polyurethane) jacketing material and Quick Disconnect options. Excellent audio quality. Extended frequency response improves intelligibility. Circumaural Cushion Kit. (sold separately) PN 83195-01 is available for use on SupraPlus models. PTT and connector options available upon request. Ruggedized SHR 2301 DYNAMIC MICROPHONE HEADSET SPECIFICATIONS Sending Characteristics (all models): Microphone Type: Noise-cancelling dynamic Frequency Range: 150 Hz to 10 kHz Output Impedance: 150 ohms nominal Noise Cancellation: 10 dB Output Amplitude @ 1 kHz: -74 dBV +/- 4 dBV (126 to 316 µV RMS) open-circuit with an input signal of -6 dB Pa applied to the front surface of the microphone housing that is held on-axis at one inch from the lip ring of an artificial mouth per IEEE Std 269-1992 and ITU-T P.51 Receiving Characteristics (SupraPlus Monaural and Dual-channel): Frequency Range: 100 Hz to 10 kHz Input Impedance: 150 ohms +/- 25% Output Amplitude @ 1 kHz: -7 dB Pa +/- 3 dB Pa with an input signal of -20 dBV through 10 ohms using a head-and-torso simulator per IEC 959, ANSI S3.36-1985, and ITU-T P.58 Receiving Characteristics (SupraPlus Binaural): Frequency Range: 100 Hz to 10 kHz Input Impedance: 75 ohms +/- 25% Output Amplitude @ 1 kHz: -7 dB Pa +/- 3 dB Pa with an input signal of -20 dBV through 10 ohms using a head-and-torso simulator per IEC 959, ANSI S3.36-1985, and ITU-T P.58 Receiving Characteristics (Ruggedized): Frequency Range: 300 Hz to 10 kHz Input Impedance: 300 ohms nominal Output Amplitude @ 1 kHz: -11.8 dB Pa +/- 5.0 dB Pa into an IEC 60318 and ITU-T P.57 Type 1 coupler equipped with a Bruel & Kjaer Type DB 0843 adapter with an input amplitude of -10.0 dBV through 300 ohms Note: 0 dB Pa = 94 dB SPL Plantronics Inc. 345 Encinal Street / Santa Cruz, CA 95060 / (800) 544-4660 / www.plantronics.com © October 2009, Plantronics, Inc. All rights reserved. The name Plantronics and the Plantronics logo are registered trademarks of Plantronics, Inc. (10-09) Printed in U.S.A.