Identifying Amplifier Class - Kenwood KA-5050R


Active Member
Hi Guys,

Was after a bit of advice… A friend of mine has a Kenwood KA-5050R amplifier and is trying to figure out what Class it is (basically to know if it’s Class D and going to throw a wobbly if a high level sub input is plumbed in).

I don’t think it is from its weight and output but anyone else know an easy way to tell? (without measuring idle voltages etc.)

I can’t even see a complete service manual anywhere online for it :-(

these are the relevant amp specs I’ve found online:


  • dynamic power output: 2 x 175 Watts / 4 Ohms
  • Nominal power (DIN = sinus): 2 x 140 watt / 4 ohm, 2 x 95 Watt / 8 ohm
  • MOS-FET power amp
  • discrete amplifier with large power reserves
  • Idle mode
  • Power consumption: 160 watts
  • Dimensions: 440 x 147 x 403 mm (width x height x depth)
  • Weight: 12 kg
Any advice appreciated.


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