Pair of 12" sub or One 15" sub for spl?

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SQL and SPL are 2 different setups...

with SQL, you will need still the clarity and hindi masasapawan ng bayo. 15" subs is the way to go for that.

with SPL, you want to attain the maximum boom boom so mas ok na 12" na dalawa.

you cannot attain or equal the power of 2 12" with a single 15". unless na lang you go kicker L7 then it can match 2 12" subs.