Characteristics of enclosure

[Jonesy22380]

Does anybody have any experience with a box designed like this? What type of performance will it have ?
Amp is a Pdr -75 rated at 425 wrms

I’m running a Psi 8

 

[hispls]

Assuming there is no pole vent and you have a good way to keep that back panel airtight and rigid I don't see any reason this wouldn't perform the same as that same airspace done any other way.