Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
The volume displacement of the H290C is 125 cubic inches sans driver. But the internal volume offsets are taken into account already, so don't "grow" the box to account for internal offsets again. More information about the H290C Horn/Waveguide is available at the link below:
The three Pi subwoofer is designed with enough port to prevent chuffing even at maximum SPL. The subwoofer is too small to offer high SPL though, so I suggest running multiple subs both for smoothing and SPL. That was always the intention of this design: It was made to be used in multiples.
I'm glad to see you already understand that and plan to run four subs. That will be perfect. But for others reading this thread, I'll provide "Multisub" links for reference below:
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