4th order design and SPL graph in WinISD

[VWBobby 10+ year member]

I need a little help designing a box and using this program. From what I've read this program somewhat sucks for designing 4th order boxes. I'm trying to go by what I've read on the forums and use WinISD as a design guide.

The subs I'm using are 2 PG Titanium 12's (old school).

So far, the best curve for decent SQ puts out a nice curve with no sharp peak at 37hz.

The graph shows 94.23DB? How can this be? Is this per sub or ?

The suggested vented enclosure puts out 89db which is the same as what's in the T/S parameters.

How do these relate?

Has anyone used these subs recently? I have only found 1 or maybe 2 posts ever showing the old school Titanium series subs (without the lights), 4 ohm single coil, 500-watts each.

Thanks in advance!

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[VWBobby 10+ year member]

Nobody uses this program? All I'm really wondering is why the spl graph is so low no matter what driver/enclosure?

If the sensitivity is 88db at 1w 1m, then why is the graph the same with a vented? I get about a 5db boost with a 4th order.