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 ***** 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.