Nap 250DR or Proac D2R

Hi-Fi Corner
58

It should be the cable that allows legacy pre-amps to connect to the NC power amps.

Lead Assembly, Legacy Preamp DIN to New Classic PA XLR, Left Channel, 4 pin DIN to XLR 00-010-0244

Connecting the old with the new - Advice on Connections: Old Classic and New Classic