Cobham’s Model 245 Speaker Amplifier and Model 251 Paging/Passenger Speaker Amplifier feature high output and reduced distortion for enhanced performance.

Cobham Aerospace Communications delivers audio and radio management solutions for military trainers, small and medium helicopters, business jets, regional and long-distance airliners, and transport aircraft.  Cobham's components and systems offer superior sound quality with significant reductions in space, weight, and power consumption.

The Model 245 is a Speaker Amplifier capable of driving a 4-ohm cockpit speaker.  18W into 4 ohms; 25W into 8 ohms.  With higher output and less distortion, it is intended to be a direct form, fit, and functional replacement for the Collins model 356F-3.

  • Weight: 0.5 lb / 0.23 kg
  • Dimensions: 3.44"W x 2.13"H x 2.88"L (87.38mm x 54.10mm x 73.15mm)
  • Power: 1.0 A max / 28 Vdc
  • TSO C50c/Compliance: DO160C



The Model 251 Paging/Passenger Speaker Amplifier is a remotely controlled, electronic unit that operates upon command from remote switches and potentiometers in the cockpit or cabin of the aircraft.  Lightweight and versatile, it provides Seat Belt and No Smoking sign chime tones, a Cabin Call ringer tone, ADF, Pilot Select Comm. (PSC), Briefer, and Cabin Paging audio (mono) to the cabin speakers.  

  • Weight: 2.6 lb / 1.18 kg
  • Dimensions: 4.90"W x 2.47"H x 10.3"L max (124.46mm x 62.74mm x 261.62)
  • Power: 5.0 A max / 28 Vdc
  • TSO C50c/Compliance: DO160C
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