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<blockquote data-quote="bumpasauras" data-source="post: 8271710" data-attributes="member: 607820">I have this setup with a few differences. I am running 2 ppi bk1800&#039;s on 2 hdc3 18&quot;s with 2 ppi 900.4&#039;s,&nbsp; 1 on 2 sets of comps 1 on 4 neo 8&#039;s. I build alts so I made a 220 amp externally regulated alt does 218 amps at 1600 rpm feeding 3 xs 3400&#039;s and a yellow top under the hood. I get no voltage drop and stay around 13.2 under heavy load.I would say that 2 xs 3400&#039;s is plenty with a yellow top under the hood. If you dont wanna spend damm near 400$ on a battery look for a 100 amp hr 1000 cranking amp batt from a autoparts store, prolly like 4 of them.I will tell you that those bk1800&#039;s are pretty nasty for the money they hammer my hdc3 18&#039;s flexes everything. I have it in an avalanche with plans on adding 2 more hdc3&#039;s on a pair of aq3500&#039;s or somthing like that but god almighty what I have is pain full loud as it is.so to answer your question if ya got the doe add 2 xs 3400&#039;s to the back loose the cap unless you are getting alt noise and using said cap for a filter cause 1 farad of capacitance will be eat up by those 2 bk1800&#039;s in like a milisecond. .</blockquote>

[QUOTE="bumpasauras, post: 8271710, member: 607820"] I have this setup with a few differences. I am running 2 ppi bk1800's on 2 hdc3 18"s with 2 ppi 900.4's, 1 on 2 sets of comps 1 on 4 neo 8's. I build alts so I made a 220 amp externally regulated alt does 218 amps at 1600 rpm feeding 3 xs 3400's and a yellow top under the hood. I get no voltage drop and stay around 13.2 under heavy load. I would say that 2 xs 3400's is plenty with a yellow top under the hood. If you dont wanna spend damm near 400$ on a battery look for a 100 amp hr 1000 cranking amp batt from a autoparts store, prolly like 4 of them. I will tell you that those bk1800's are pretty nasty for the money they hammer my hdc3 18's flexes everything. I have it in an avalanche with plans on adding 2 more hdc3's on a pair of aq3500's or somthing like that but god almighty what I have is pain full loud as it is. so to answer your question if ya got the doe add 2 xs 3400's to the back loose the cap unless you are getting alt noise and using said cap for a filter cause 1 farad of capacitance will be eat up by those 2 bk1800's in like a milisecond. . [/QUOTE]

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