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<blockquote data-quote="Jeffdachef" data-source="post: 8432699" data-attributes="member: 650438">Thing with 15s is, you&#039;ll definitely need to get a high output alternator 300 amp+ along with a big giant battery bank and those hdc4 15s like 8 to 9 cubic feet of net airspace total buuuuut they are beefy subs, you&#039;ll need a f*ckton of bracing.&nbsp; Plus with two, if you want them at their fullest potential, you can throw a 7-8k (wired to 1 ohm before rise (inb4 Hispls gives me ****) amp on them if you want to completely max them out.&nbsp; &nbsp; Thing is idk if you have enough space to hold the batteries because the box will completely eat up your room.Single 18 will be cheaper overall and still get ridiculously loud, box specs call for 6.5 cubic feet tuned to 33-38hz (you dont need lower tbh its proven that you&#039;ll just lose out on output for these particular subs) . You&#039;ll have space for batteries etc.. you can run a 3.5k korean amp at .5 ohms with plenty of battery power.If you are just deciding on 1 15 vs 1 18.... No contest, go with the 18.Is there something in the back of your mind telling you that 18s dont have good sound quality or some sh*t like that?</blockquote>

[QUOTE="Jeffdachef, post: 8432699, member: 650438"] Thing with 15s is, you'll definitely need to get a high output alternator 300 amp+ along with a big giant battery bank and those hdc4 15s like 8 to 9 cubic feet of net airspace total buuuuut they are beefy subs, you'll need a f*ckton of bracing. Plus with two, if you want them at their fullest potential, you can throw a 7-8k (wired to 1 ohm before rise (inb4 Hispls gives me ****) amp on them if you want to completely max them out. Thing is idk if you have enough space to hold the batteries because the box will completely eat up your room. Single 18 will be cheaper overall and still get ridiculously loud, box specs call for 6.5 cubic feet tuned to 33-38hz (you dont need lower tbh its proven that you'll just lose out on output for these particular subs) . You'll have space for batteries etc.. you can run a 3.5k korean amp at .5 ohms with plenty of battery power. If you are just deciding on 1 15 vs 1 18.... No contest, go with the 18. Is there something in the back of your mind telling you that 18s dont have good sound quality or some sh*t like that? [/QUOTE]

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