The PC406-D 4-Channel 600W Power Amplifier from Yamaha. Use the PC406-D as a supplementary matrix to expand the overall system matrix, allow direct sound input from other analog devices or Dante gear, and more. Several processing features are available with the PC406-D. This includes 16-band PEQ, delay, peak limiting, and RMS limiting. Different functions ensure speakers can be perfectly tuned precisely and easily. Other adjustments are made possible with Dante outputs, adding more Room EQ for more amp channels. Optimized presets are supplied in the speaker library for Yamaha speakers so perfect tuning of Yamaha speakers is effortless.