SHAKING BUILDINGS WITH 1 SUNDOWN ZV4 12!!

So I was listening to the zv4 12 at the bank after it was closed and people started coming up saying I was shaking buildings with it...Thats just crazy to me that a single 12 is causing that much havoc!
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SYSTEM COMPONENTS
HEADUNIT- PIONEER 8300 UB
DIGITAL VOLT METER
MECHMAN 370 AMP ALT WITH EXTERNAL REGULATION
XS POWER 3000XP
XS POWER 7500D
0 GAUGE WIRE
2 INCRIMINATOR AUDIO 20.1 SUB AMPS
1 SUNDOWN ZV4 12 / AERO PORTED BOX TUNED TO 30HZ
2 SKAR AUDIO PAX 8S
2 SKAR AUDIO PAX 10S
4 PRECISION POWER PT2 TWEETERS
1 SUNDOWN 100.4
VIPER ALARM