amp problems

so i finished my build, I have two 4 ohm Sa v.2 down to 1ohm wired to a banda 3000.1 my amp will go into protect mode when I hit loud volumes when i play downloaded music off my phone but when I play music off of youtube i can push it a lot harder, im kinda of confused, any one have any ideas, I grounded it to the body of the trunk and my power wire is hooked to the battery. tomorrow morning im going to test the ground.

romajiro,

Your amp is maybe ? Getting stresses from maximum current draw [ turn volume down ]

so I checked the ground it was good, but my battery will drop below 12v when it hits hard, so im going to do the big 3 upgrade and get a better battery next week or so.

Different music sources have different loudness levels. Guessing this is more of an SPL setup.