two sealed SE 15s vs. 1 ported XXX 15....which one takes the cake for sq and SPL?
Also, how much louder would two 15 xxx ported be compared to 1? Like 4-5 dB?
And lastly, are there downsides to buying two used subs to run together, but from different people? Like, someone might have played one harder or broke it in different...?