is 140db from a single subwoofer loud?

140dB with 900watts and a single 12 in my truck here. the box is tune to 60 and i was playing test tones, but still. oh and it was a rockford RFR2212 that i payed $8 for

 
140 with a 10 is loud now with a 15 i wouldnt say the same i did a 140 with 2 12's 1200 watts tuned to about 45 once and when i got my ole box back in i did a 138.9 to music with the same setup but tuned to like 40.

also added a new amp brutus 2006 and did a 141 on term with 2 12's tuned to like 40 so i am building new box for two hx 2 power series looking for 145 with 2000 watts and 150 with 4000 watts tuned to about 38 for music and 54 for tones

 
I had a old 10 inch pioneer sub rated at 100 rms.I put it in a 6 cubes total with a 150 sq inch port and it would burp 142's.people thought i was running a 15,,then i popped the hatch and they couldnt beleive it was a ten.

 
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