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Qu​​estion: 

What is the difference between the SRX835 enclosure with the triangle shaped port holes and the one with the circular, tube style ports?

Answ​​er: 

The one with the triangle shaped ports on the front is for the self powered version, with a built-in amplifier (SRX835P), while the one with the tube style port is for the passive version, without the amplifier (SRX835).​​​