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<blockquote data-quote="h17250x" data-source="post: 2792536" data-attributes="member: 575226">tYou definitely have to double the airspace when adding another sub.&nbsp; The port size will change but if you choose to use a common enclosure it may not be double the size.&nbsp;&nbsp; What you should do is call around to some local shops and see if they have a box building program.&nbsp; When you find one ask if they have the specs on the subs that you are using.&nbsp; If they don&#039;t you can get the specs on the woofers in the owners manual or find them online with the manufacturer.&nbsp; You will need the theile small parameters so they can tell the program what your subs specs are and can predict what the box design output will be.&nbsp;&nbsp; If you don&#039;t want to mess with that and like the way your current box sounds just build a box with the same airspace on each side of a divider and use the same size port that your old box has on each side of the divider.&nbsp; Make sure that your port is at least one thickness of the wood that you are using away from the sides and back of the box.As for your &quot;current&quot; situation the power caps don&#039;t give you any extra current they just give your amp power faster and help to keep from beating the crap out of your alternator.&nbsp; Your options as i see it to fix the problem is to first upgrade the battery.&nbsp; I only use Optima batteries( the ones that look like a 6 pack). They are about 200 bucks but they work.&nbsp; Every battery that you add puts an extra 10 amp load on your alternator.&nbsp; I would just replace the stock battery if you are still using it with something better.&nbsp; Go ahead and keep using the power caps though.If you still don&#039;t have enough juice you can try to add a second MATCHING battery.&nbsp; If you still have a hunger for power you may have to replace the alternator with a high output one.&nbsp; If there is an alternator/starter shop around they may be able to beef your stock one up for alot less than an out of the box high output powerplant($400-700).&nbsp;&nbsp; Hope i have helped.&nbsp; Power supply is just expensive but if you want everything to put out what it can you have to feed it the juice.</blockquote>

[QUOTE="h17250x, post: 2792536, member: 575226"] tYou definitely have to double the airspace when adding another sub. The port size will change but if you choose to use a common enclosure it may not be double the size. What you should do is call around to some local shops and see if they have a box building program. When you find one ask if they have the specs on the subs that you are using. If they don't you can get the specs on the woofers in the owners manual or find them online with the manufacturer. You will need the theile small parameters so they can tell the program what your subs specs are and can predict what the box design output will be. If you don't want to mess with that and like the way your current box sounds just build a box with the same airspace on each side of a divider and use the same size port that your old box has on each side of the divider. Make sure that your port is at least one thickness of the wood that you are using away from the sides and back of the box. As for your "current" situation the power caps don't give you any extra current they just give your amp power faster and help to keep from beating the crap out of your alternator. Your options as i see it to fix the problem is to first upgrade the battery. I only use Optima batteries( the ones that look like a 6 pack). They are about 200 bucks but they work. Every battery that you add puts an extra 10 amp load on your alternator. I would just replace the stock battery if you are still using it with something better. Go ahead and keep using the power caps though. If you still don't have enough juice you can try to add a second MATCHING battery. If you still have a hunger for power you may have to replace the alternator with a high output one. If there is an alternator/starter shop around they may be able to beef your stock one up for alot less than an out of the box high output powerplant($400-700). Hope i have helped. Power supply is just expensive but if you want everything to put out what it can you have to feed it the juice. [/QUOTE]

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