When it cranks, does it crank fast or slow? If it's slower than usual, then it might be the battery.
Do a load test on it or use a DVOM. Probe the lead on the positive/negative terminal on the battery and start the car. If voltage drops bellow 9.6volts while cranking, the battery is no good or you may have a parasitic draw somewhere which drained the battery prior to starting.
I am leaning more towards a parasitic draw since i am assuming that this didn't happen before the subs/amp/deck were installed. I may be wrong tho.
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