what head unit do you have, usualy head units have around 4 50 watt channels, if your trying to push 180 watt speakers it just wont work, you probably need an amp to boost it up, i'd say get a cheap 4 channel amp, i cant remember it offhand but there's a formula to how many watts amp you need to drive the speakers, but i think that you would need more then what the headunit can deliver. keep in mind if its peak watts or RMS. i had a set of pioneer kevlars and they where only 73 watt RMS, but they where 330 watt peak, RMS ratings give a better indication to how good the speakers, amp and whatever else are.
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