Whats the difference in SPL and SQL?

[geforce]

I am having problem to Understand SPL

AS you Mention
sq= this is used for sound quality. woofer with sq will have higher xmax and will be optimized for sealed application. usually it will have a low fs like 28-30.
now a days avery few woofers are made into this catogery and those which are made can also be used in sql applications.

right , BUT AFTER LOOKING ON PIONEER TSW 8102SPL , its pure SPL Competetion subs
FS : 23.5hz
Xmax :15.5mm

i am having confusion

On 3000Wrms it can hit 170db
take a look at this spec
Small theile parameters
http://www.pioneer.eu/eur/products/25/131/201/TS-W8102SPL/specs.html

[murtnabila]

Not an sq sub. Check out the mms it's sitting at 800g! That's just under a kilo of moving parts. Fs is not the only t/s papameter to look at.

[geforce]

yaar , fs show that the all forces on woofer are in balance , on that frequency it shows Equilibrium of subwoofer

i know its not SQ sub , its pure SPL