Mu kicker amp l5 is hooked up to a small 210 watt rms amp, if i get a 850

That sub NEEDS power as its a bit inefficient, has a heavy cone, big magnet. If you dont want to buy another amp, a ported box would make a difference (if its not in a ported box already).

That increase in power might make you think twice about getting another sub, either way you need more power!
 
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