a true test would be on the meter. and i got a meter and ill drive over to a commercial spot that you know of and test amplifiers. i can tell you this i highly doubt the incrimanator audio amp is as loud as the orion. probably within a db but not as loud ive tested many many many amps. heres a list of the amps i can renember of the top of my head right now
zapco 9.0
powerbass 3000d
memphis 4000d
earthquake d3
and 5000
vr2000d
vr4000d
mmats d3000.1
treo 1500.1
soundstream xxx 6500
orion 2500
collosus
their all good amps. and i bet so is the ia 20.1 but its a 1800 watt amp its not fair to compare it to a 2500 watt amp. it does have one advantage it is strappable and for dbdrag that means it will stomp on one orion almost most likely. but in my test say you got 2 mmats d3000.1 off one battery and add another 2 amps you only gain 1 db if your lucky. it happens like that most of the time. and thats if you can keep the amps from turning off.