what kind of tests can be ran on an installed amp to check voltage or signal output?i got a kx600.1 and a 7day old AQ2.5 15.i installed everything and built the box.it was banging so hard i really coulnt believe it.i had very little voltage drop and only at idle on the dash guage.decided to do big 3 upgrade and had some problems with major volts drop afterwards and bass was very muddy.went beck to factory set up on wiring to alt and bass is still muddy and i got some drop at low hz.anything over 32hz sounds like dirt.before all this happened i could have vol on hu at 12 and everything was crisp and clean.now at 20 you can hardly hear the bass.at 28 all but the lowest hz are muddy.amp is not in protect,both rca's sound the same switching them around and running individually,box has no leaks and sub is still tight and solid.anyway to check the output ignal on the speaker wires to see if anything is wrong?
Not quite sure what you're wanting to do here, but the voltage drop problem sounds like a bad ground. Did you sand and clean the areas where you made the big 3 connections? I recommend doing that especially if it's an older vehicle.