You will note that A-180-9 has an unequal number of channels. 8 for the top and 6 for the bottom. So if you order the Intellijel companion 1U modules this gets a bit confusing. Channel A = channel 2 on the Intellijel, and I presume you lose channel 8. So you don't get the full 16 channels pairing 2 Intellijel with an A-180-9. If you need all 8 channels on every Intellijel you buy, then you need an A-180-9 for EVERY Intellijel module. The bottom A-F channels are wasted. Unless you connect the A-F channels between Doepfers and leave the Intellijel out of it. Another one of those reading the fine print situations. And another tidbit if you use the bottom six A-180-9 sockets... A = 2, B = 1, C = 4, D = 3, and so on. an annoying byproduct of Ethernet wiring presumably.