Modeling Subs, SPL Figures Right?

[dftnz7 10+ year member]

Okay so I am contemplating a sub purchase...and I am looking at Dayton HOs, FI SSDs, RE SEs, AP Epics, Peerless XXLS, DIYMA 12, etc. The Peerless 830877 models as being significantly the loudest in .9 cubes net with 600wrms than all the others, while also playing the lowest. It has crazy sensitivity at 94.xx while most of the others are pretty lazy, but still.

I cant imagine the Peerless XXLS being louder than all these other subs, my friend has an SSD in a way too small box with 600wrms and it gets pretty **** loud. So should I be taking these SPL figures with a grain of salt or are these pretty accurate? The DIYMA 12 is by far the lowest in terms of output, and has the lowest sensitivity as well.

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[Immacomputer 10+ year member]

Completely useless to use. Winisd can't tell you which system will be louder because it just uses the SPL spec that you input. That is for a small signal analysis and things will change with added power. Winisd doesn't account for power compression and mechanical limits and so it just multiplies the SPL spec by the input power you specify.

 

[dftnz7 10+ year member]

so how can one get an estimate of actual output of a given subwoofer in a given enclosure at a given power level?

 

[Immacomputer 10+ year member]

Well, you really can't. The closest you can come is to estimate using the mechanical throw of each driver if you're only using sealed setups. But even then, that's not going to tell you much since it doesn't account for power handling and power input. That form of estimation won't give you an idea of frequency response either.

 

[dftnz7 10+ year member]

Wouldn't motor strength play a large part as well? The Peerless XXLS shows only 12.5 mm linear xmax, but they only use the overhang for this spec. Supposedly it has WAY more throw than this.

 

[Immacomputer 10+ year member]

That's why I said "mechanical" throw, not linear throw. And yes, motor strength will play a role in output. Pretty much everything on a driver plays a role in its efficiency and frequency response, both of which pertain to output.

The differences in output of those drivers is not going to be huge between them assuming that they're all sealed in the same vehicle. I would be more concerned about the frequency response of the driver in the application that I am planning on using them in. All of those subs have the capability to get pretty loud for a daily driving setup that isn't all about blasting Jeezy at stop lights.