• Country
• Japan

• Manufacturer / Brand
• Sony Corporation; Tokyo

• Year
• 2002 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 236938

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 12 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 320 W (444 W max.)

• Material
• Metal case

• from Radiomuseum.org
• Model: 4/3/2 Channel Power Amplifier XM-444 - Sony Corporation; Tokyo

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 260 x 55 x 180 mm / 10.2 x 2.2 x 7.1 inch

• Notes

• Car Power Amplifier, 12 V, 4/3/2 channel MOSFET.

  Specification
  Circuit system	OTL (output transformerless) circuit Pulse power supply
  Inputs	RCA pin jacks High level input connector
  Input level adjustment range	0.3—6V (RCA pin jacks), 0.6—12V (High level input)
  Outputs	Speaker terminals
  Speaker impedance	2 - 8Ω (stereo) 4 - 8Ω (when used as a bridging amplifier)
  Maximum outputs
  4 Speakers:   3 Speakers:   2 Speakers:	80W x 4 (at 4Ω) 80W x 2 + 222W x 1 (at 4Ω) 222W x 2 (at 4Ω)
  Rated outputs (supply voltage at 14.4 V)
  4 Speakers:	35W x 4 (20Hz - 20kHz, 0.04% THD, at 4Ω) 40W x 4 (20Hz - 20kHz, 0.1% THD, at 2Ω)
  2 Speakers:	80W x 2 (20Hz - 20kHz, 0.1% THD, at 4Ω)
  Frequency response	5Hz - 80kHz +0dB,-3dB)
  Harmonic distortion	0.005% or less (at 1kHz, 4Ω, 10W)
  Low-pass filter	80Hz, -18dB/oct
  High-pass filter	80Hz, -12 dB/oct
  Power requirements	12V DC car battery (negative ground)
  Power supply voltage	10.5 - 16V
  Current drain	at rated output : 20A (4Ω, 35W x 4) Remote input : 1.5mA

• Net weight (2.2 lb = 1 kg)
• 2.4 kg / 5 lb 4.6 oz (5.286 lb)

• Literature/Schematics (1)
• - - Manufacturers Literature (Service manual XM-444 dated 2002.02)

• Author
• Model page created by Eckhard Wegner. See "Data change" for further contributors.

• Other Models

• Here you find 4003 models, 3852 with images and 959 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sony Corporation; Tokyo