I missed your post about brown-outs. You need under-voltage protection if your equipment doesn't have it. The Panamax AV-Pro has that and over-voltage protection too.
What is the voltage protection rating (VPR) of the whole house surge protector? The VPR is the voltage downstream equipment will be subjected to when the protector operates. Note the Panamax starts clamping at 200V peak but can let through as much as 500V in the 6kV/3kA combination wave test of UL1449. TVs and AVRs will snap, crackle, pop unless they have their own surge protection - and I expect they do for 500V peaks.
As for limiting current, some, like the Furman, limit the available steady-state current. The Panamax doesn't. As for transient current, I wouldn't expect a device like the Panamax to limit it at audio frequencies. The protection works at much higher frequencies. | 
