What are the compatibility issues I need to worry about with IQ-PIP modules?

Depending on the vintage of amplifier and type of PIP, there are some combinations that work better together than others. The most important issue is PIP versus PIP2. The IQ-PIP-USP2 and IQ-PIP-USP2/CN may only be installed in a PIP2 amplifier. The IQ-P.I.P.-MEM and IQ-P.I.P.-SMT will function in either a PIP or a PIP2 amplifier. From a strictly IQ perspective, all of these modules communicate using our newer IQ2 protocol. An IQ-INT III or IQ-USM 810 is required as the system interface (older mixers cannot be used).