• Both of the Onkyo Integra M-508's speakers feature a power-in phase transformer.amplifier image by Darko Draskovic from Fotolia.com
  
  The Onkyo Integra M-508 is a Japanese stereo power amplifier that was manufactured from 1986 to 1991. Each speaker features an electric current with a power-in phase transformer, which eliminates possible confusion with the input signal and improves the phase response. This amplifier also features a linear switching circuit with a high-bias and wide bandwidth (20 MHz) power transistors. Its size and weight are smaller than the Grand Integra M-510, even though it has most of the same functions.
  
  

Music and Continuous Power

• The music power output of the Onkyo Integra M-508 is 2 x 450 watts at 4 ohms, 1kHz (DIN) or 2 x 260 watts at 8 ohms, 1kHz (DIN), depending on the model. The continuous power output is 200 watts per channel with a minimum RMS at 8 ohms. Both channels are driven from 20 Hz to 20 kHz, with no more than 0.003 percent THD.
  
  

Distortion and Frequency

• The Onkyo Integra M-508 total harmonic distortion is 0.003 percent at rated power and 0.003 percent at a 1 watt output. The intermodulation distortion is 0.003 percent at rated power. The frequency response varies from 0-1.5 dB, with a variation from 1 Hz to 100 kHz.
  
  

Input Specifications

• The input sensitivity is 1.0V and the input impedance is 20 kohms on the Onkyo Integra M-508. There is a dumping factor of 140 (8 ohms, 1 kHz). The S/N ratio comes out to 120 dB (1 HFA, Shorted). The input is variable direct.
  
  

Power Supply

• The Onkyo Integra M-508 power supply varies. European models have an AC of 220V with 50Hz, Canadian models have an AC of 120V with 60Hz, and British and Australian models have an AC 240V with 50Hz. Switchable models have an AC of 220V with 50Hz.
  
  

Physical Specifications

• The Onkyo Integra M-508's physical dimensions are 18.25 inches wide and 7.25 inches high and 16.75 inches deep. It weighs 25 kilograms (55.1 pounds).