Wanted to clarify some things
Lets clear some things up here for everyone:
Sensitivity – The sound pressure level produced by a loudspeaker, usually specified in dB, and measured at 1 meter with an input of 1 watt or 2.83 volts, typically at one or more specified frequencies.
Maximum SPL – The highest output the loudspeaker can manage, short of damage or not exceeding a particular distortion level.
It is possible to have a "lower power" (power rating) speaker play louder with less power than a "high power" speaker, and visa versa. It depends on sensitivity. Compare a horn tweeter with 5 watts, to a 18"subwoofer with 10 watts. I guarantee the horn will be louder. But the opposite can happen also, it all depends on the speakers. You can't really make a blanket statement either way just on power rating.
Even sensitivity is not a linear measurement. If you want to know which set of speakers will be louder, buy both and compare them.
The MTX RE-Q will attempt to recreate lower frequencies to add a subwoofer to a system. (Frequencies filtered by the factory headunit).
"Bass restoration signal processor Get full bass response when adding amps to a factory system". Really does not "clean anything".
The JL Cleansweep, will remove all of the factory equalization of the head unit, making the signal a "flat response". The draw back to me, is that you also have to use the volume on the JL unit so it receives a consistent signal for it to adjust. If you changed the volume on the headunit, it might change the factory equlization.
Th JL unit basically makes the factory headunit a "high end" headunit.
Before buying either, go to the mfr webpages, and read the specs, then decide what you want.
And finally every 3db increase in SPL is twice as loud. Not 10 not 2, but 3db.
