Yaris Sedan Deadening and Sound system upgrade

[derickveliz2]

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If there are 2 types of speakers characteristics:

-Free Air (no need of enclosure just a baffle)
-Enclosure specific (XX cubic feet of internal volume)

So I asked my self?... is the internal volume of the spheres enough for the HL-70 to perform properly?

I email Hertz and they told me it's a Free Air driver and for my application I need at least 1 Liter = 61.0237 in³ of internal volume. According to my math a 5" sphere is about 65 in³ so I should be OK, but "NO" I measured the spheres and real dimensions have a 4.5" diameter less the sides I cut short to match the a-pillars... I did a water test to find out the internal volume and it's a little under 1/2 liter.

I guess I'm going to have to open a second hole into the A-pillars to vent the enclosure for proper driver performance. Also will use some Poly Fill.

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