DescriptionThe Marantz model 2440 quadradial adaptor amplifier converts any stereo system with tape source monitor feature to a full featured 4-channel system.The 2440 incorporates Marantz's exclusive vari-matrix circuit which simulates 4-channel sound from normal 2-channel stereo programs, and is capable of reproducing 4-channel sound from any matrix encoded source.It will also reproduce any discrete 4-channel program as well as regular stereo and monaural programs.An optional plug-in... decoder adapts the 2440 for specific matrix systems such as Columbia's SQ or Electro-Voice Stereo 4.SpecificationsPower output: 20W/ch into 8Ω (stereo)Frequency response: 5Hz to 45kHzTotal harmonic distortion: 0.3%Damping factor: 45Input sensitivity: 150mV (line)Signal to noise ratio: 80dB (line)Channel separation: 30dB (line)Output: 1V (Pre out)Dimensions: 17-1/3 x 5-1/3 x 14-3/8 inchesWeight: 24.2lbsFully refurbished by our in-house technician with over 40 years in the industry. We ship within the US only and do not accept returns.All items listed are fully functional unless otherwise noted. Thank you for your time!