Initially sold for ¥90,000
The Yamaha Q2031 is a 31-band dual channel graphic equalizer, virtually identical to stacking two GQ1031 but with some extra features. For example, there are XLR balanced inputs and outputs, a High Pass filter for each channel and the ability to tune the levels more finely by adjusting the maximum boost/cut from 12dB to 6dB.
Before a slightly more important update in the 1990s, a minor revision was sold at a lower price in 1988, dubbed the Q2031A. The specs are identical.