Which units can I combine in dual unit mode?

The following table shows which combinations of 2 units are supported in dual unit mode:

Dual unit combinations in green can be used together, those in red cannot be used together.

Therefore any two Saffire PROs can be used together, apart from the Liquid Saffire 56 which can only be used with Saffire PRO 26, Saffire PRO 24 DSP, Saffire PRO 24, or Saffire PRO 14

In Dual Unit Mode, only sample rates of 48kHz and below are supported.