Rear speaker Remoed dB increase?

hey today i took the task of removing the rear speakers. This was in a 99 civic lx 4dr witht he notorious rear deck. It took me about 2 hours i couldnt place the rear deck back on proerply only 2/6 of those plastic clips are in the right spot but its holding decently. Anyways i Noticed a DECENT increse in the output. Much more bass int he car now more stuff is shaking than before but now my rattle that i had in the trunk is GONE. How many dB's increase did i get my doign this ? I was easily able to see that the bass is much louder now so im guessing 3 db mabye more ? anyoen have a clue?

Only a SPL meter can tell you for shure.

lol thats true. But i could here the difference a lotta trunk rattle is gone now. Id reccomened removing rears for anyoen not using them. lets just say it was worth the 2 hours of hell of takign them out and putting back the rear deck / dash board thing it was a pain but worth it.