Pioneer AM/FM stereo receiver model QX-949A. One of Pioneer's best 4 channel stereos. 53 watts per channel at 4 ohms, 75 watts per channel at 8 ohms. Features 2 phono inputs, two tape monitors, 2/4 channels, low and high filters, two bass/treble controls, has both tuning and signal meters, also has the 4 channel meter indicators, 2 or 4 channel selectors. From 1977 - 1979. What's the different between the SX-949 and the SX-949A, The QX-949A The 949A adds "logic" to the SQ board. Neat Receiver.