Should i get a 2nd sub, or just a compeletely differnt sub all together?

[shpatb 10+ year member]

subject pretty much says it, i don't know if i just want to get another spg555 or something else that would have SQ in that range but alot more spl, if that makes sence?

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[btdickey99 5,000+ posts]

thats a great sub, I owuld just get a 2nd and mess with it

 

[shpatb 10+ year member]

i really love the SQ of it, but i wonder just how loud it is comparetively to other subwoofers.