what specs on a sub defines its sq?

[pinoywitboom 10+ year member]

was wondering what specs on a sub defines its sq? i know xmax has to do with how linear your sub stays with increased power but what else specs show good a subs sq is?

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[squeak9798 5,000+ posts]

was wondering what specs on a sub defines its sq?

None of the T/S parameters tell you about the "sq" of a sub.

i know xmax has to do with how linear your sub stays with increased power

Not really.

Xmax is (in theory) the amount of linear excursion the subwoofer is capable of. But two subs with the same Xmax can have varying degrees of linearity over their stroke.

But there are multiple ways to measure Xmax, some more accurate than others. All Xmax is not created equally. In order to accurately compare two Xmax figures, you would need to know how they were measured. Otherwise the comparison could be rather meaningless.

but what else specs show good a subs sq is?

None of them.

The T/S parameters don't tell you anything about the "sq" of a sub. What you would need to begin to determine the "sq" is distortion measurements, a measurement of the Bl, Cms and Le linearity, etc.

All the T/S really tell you is what type of low end response you should expect for a given enclosure volume/type. The one exception to this is Le, which when combined with Re will help you determine at what point the upper end response begins to roll-off.