Check it out. if you series speakers together you will raise the ohm load (4ohm + 4 ohm =8ohm) parallel (4ohm +4 ohm = 2ohm)
"mono block" amps are 1 ohm stable, with the lower the ohm load the higher the power produced. so to answer your question you need to find out
1 how many subs you want
2 are they dual or single voice coil
after that calculate ohm load to see if you purchase the 2,4 or 8ohm subs
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