Subwoofers?
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The most important part of amp shopping is sizing it correctly for your system. You need to pick your speakers/subs first. Dual voice coils are ideal because you can wire them to almost any ohm resistance to work with a lot of amps. If your only doing subs then you'd want a monoblock. Rms is the power that matters. Get an amp close to the total rms of the speakers you hook up to it.
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For an unamped version you are looking at $3-400 + a 200watt or so amp. Amp built in version is $5-600ish on the MTX thunderforms. Find a used one IMO. Look on craigslist, I got one with a 200 watt alpine amp for $150. It fits perfectly and sounds GREAT. I rewired the box parallel so its 2ohm load. The MTX thunder4000 subs it comes with are 400 watt speakers but the 200watt amp pushes it nicely. I would suggest if you buy a used one, pull out the speakers and replace all the mount screws with stainless, they are prone to rust. I plastidip'd the box too, came out nice.
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