Vibe's most powerful amp does 2800W max when connected to a 1-ohm mono load. If the system's total power is 38800, you need at least 14 amps to power it.
3 4-ohm speakers in parallel gives you a 1.33-ohm load at the amp. When connected to a 1.33 ohm load, 2800/1.33 ohms = 2156W per amp when connected to the three parallel speakers.
38,800W/(2156W per amp) = 18.0 amps
However, I looked on Vibe's website, and these are dual voice coil 4-ohm subs, which means that wiring three together for low impedance gives you either 2/3 ohms or 8/3 ohms to the amp, neither of which is optimal, and neither of which will get you anywhere near 38800W for 16 or 18 amps.
You could wire 2 subs with all voice coils in parallel for a 1-ohm load but you'd have too hook them up to 18 amps, and then you'd get at total system power of 2800W*18Amps: 50,400W.
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The math:
Vibe's most powerful amp does 2800W max when connected to a 1-ohm mono load. If the system's total power is 38800, you need at least 14 amps to power it.
3 4-ohm speakers in parallel gives you a 1.33-ohm load at the amp. When connected to a 1.33 ohm load, 2800/1.33 ohms = 2156W per amp when connected to the three parallel speakers.
38,800W/(2156W per amp) = 18.0 amps
However, I looked on Vibe's website, and these are dual voice coil 4-ohm subs, which means that wiring three together for low impedance gives you either 2/3 ohms or 8/3 ohms to the amp, neither of which is optimal, and neither of which will get you anywhere near 38800W for 16 or 18 amps.
You could wire 2 subs with all voice coils in parallel for a 1-ohm load but you'd have too hook them up to 18 amps, and then you'd get at total system power of 2800W*18Amps: 50,400W.