[Montecristo]

It's fine, I'll let an installer do it. Where do I get technic harness?

[bmw325i]

Originally Posted by Montecristo

It's fine, I'll let an installer do it. Where do I get technic harness?

PM Technic.

I'd definitely like to see some pics and/or termlab scores when it's all done.

[Montecristo]

Brother, you'll be the first to see. Thanks for your patience and help. I'm sure I'll have plenty more questions.

[Montecristo]

1. Should I look into capacitors at all?
2. Do you think ported Fi Q will be able to keep up electronic music? fast bass hits?

And as far as installation, is it as easy hooking up aftermarket to subs>aftermark amp to oem amp> then providing power to amp?

[bmw325i]

Originally Posted by Montecristo

1. Should I look into capacitors at all?
2. Do you think ported Fi Q will be able to keep up electronic music? fast bass hits?

And as far as installation, is it as easy hooking up aftermarket to subs>aftermark amp to oem amp> then providing power to amp?

1. I've never used a capacitor. If I were to use one I would get this
http://www.sonicelectronix.com/item_...e-RFC10HB.html

2. Fi subs actually have pretty good sound quality. If you tune low or use a sealed box it should sound good and still get loud.

3. With Technic's harness it is really simple. You run an RCA cable to the amp and remote from Technic's harness. Power and ground from the battery.

[Montecristo]

Originally Posted by bmw325i

1. I've never used a capacitor. If I were to use one I would get this
http://www.sonicelectronix.com/item_...e-RFC10HB.html

2. Fi subs actually have pretty good sound quality. If you tune low or use a sealed box it should sound good and still get loud.

3. With Technic's harness it is really simple. You run an RCA cable to the amp and remote from Technic's harness. Power and ground from the battery.

1. Why do you recommend that capacitor and how do I know if a capacitor is good?
2. I want to go ported but I just want to make sure it can keep accurate with electronic music
3. And you make it sound so easy!!

[bmw325i]

Originally Posted by Montecristo

1. Why do you recommend that capacitor and how do I know if a capacitor is good?
2. I want to go ported but I just want to make sure it can keep accurate with electronic music
3. And you make it sound so easy!!

1. I don't normally use capacitors but if I did that is the one I'd use. It has good reviews and Rockford Fosgate is a good brand.

2. Do it.

3. It is.

[Montecristo]

Originally Posted by bmw325i

1. I don't normally use capacitors but if I did that is the one I'd use. It has good reviews and Rockford Fosgate is a good brand.

2. Do it.

3. It is.

How many ft of 1/0 gauge should I buy to replace the big 3?

[bmw325i]

Measure it or overestimate how much you need. I would add onto the stock power cables instead of pulling them out and replacing them. Then you'll have a run of 1/0 gauge and the stock 2-4 gauge wire that BMW uses.

[Montecristo]

Why would you rather add onto it? Wouldn't be better to have all new 1/0 gauge?

Also, I had a friend who works on cars do a ballpark estimate and he said about 22ft, 25 ft to be safe. That's for the big 3 and amp, sound right?

[bmw325i]

Originally Posted by Montecristo

Why would you rather add onto it? Wouldn't be better to have all new 1/0 gauge?

Also, I had a friend who works on cars do a ballpark estimate and he said about 22ft, 25 ft to be safe. That's for the big 3 and amp, sound right?

1/0 gauge plus the stock cable is better than 1/0 on its own. The stock cable is pretty thick to begin with.

I don't know where you are putting everything. Measure it. You should get red cable for all your positive cables and black for all the grounds. You also need a fuse, fuse holder, and terminal rings.

[kaigoss69]

Good luck running 1 gauge wire from the alternator to the trunk. I'd say do that last and only if you need to. If you don't have huge voltage drops it won't be necessary. The stock wiring is beefier than in most other cars. Capacitors don't work well. Second batteries work much better for that purpose. Using a cap and a second battery together is not advisable.

[kaigoss69]

Some advice on how to prevent damage to your electrical system and save yourself further trouble and money down the road:

1. Know exactly what type enclosure you want. Consider efficiency and sound characteristics, as well as installation.
2. Know what type sub you want. Power handling is not always the only indication of how loud they will get. Efficiency is very important, especially if you want to push the electrical system to its limits.
3. Choose an efficient amp. Class D is usually the most efficient. You could have a huge difference in amps drawn between different amps, given the same output level.

I'm not exaggerating when I say you could build two different systems which will both have the same output, but one will draw more than twice the amperage of the other. One will be easy on your electrical system, the other has the potential if costing you thousands of dollars down the line.

[Montecristo]

1. I listen to mostly electronic so I'm pretty set on sealed.
2. I am getting 2 FI Q 12's or 15's, I haven't measured my trunk yet. Using this as my go to http://www.soundsolutionsaudio.com/f...es-cut-sheets/
3. I will be getting a Sundown 3500 D.

4. I will at least upgrade my stock battery and won't get a second one unless needed. What should I replace with 1/0 gauge?
5.And where can I get everything you stated? Can I buy a 1/0 gauge rockford amp wiring set? Will that cover everything?
6. My amp is 1ohm stable, so should my two subs be 2ohms each wire parallel with a final resistance of 1ohm?

[bmw325i]

Originally Posted by Montecristo

1. I listen to mostly electronic so I'm pretty set on sealed.
2. I am getting 2 FI Q 12's or 15's, I haven't measured my trunk yet. Using this as my go to http://www.soundsolutionsaudio.com/f...es-cut-sheets/
3. I will be getting a Sundown 3500 D.

4. I will at least upgrade my stock battery and won't get a second one unless needed. What should I replace with 1/0 gauge?
5.And where can I get everything you stated? Can I buy a 1/0 gauge rockford amp wiring set? Will that cover everything?
6. My amp is 1ohm stable, so should my two subs be 2ohms each wire parallel with a final resistance of 1ohm?

1. I think sealed is a good idea. Ported would take up quite a bit of space. Get the high qts subs if you are using a sealed box.

4. I think you should get a second battery. I wouldn't bother with the capacitor.

5. You can get everything from knukonceptz.com or use a Rockford kit and get any extra wire you need from eBay by the foot.

6. You need 1 ohm voice coils. Wire the voice coils in series for a 2 ohm load on each sub and the 2 subs in parallel for 1 ohm load. Get all the options on the sub except internal leads.

[bmw325i]

Check this out.

[Montecristo]

Originally Posted by bmw325i

1. I think sealed is a good idea. Ported would take up quite a bit of space. Get the high qts subs if you are using a sealed box.

4. I think you should get a second battery. I wouldn't bother with the capacitor.

5. You can get everything from knukonceptz.com or use a Rockford kit and get any extra wire you need from eBay by the foot.

6. You need 1 ohm voice coils. Wire the voice coils in series for a 2 ohm load on each sub and the 2 subs in parallel for 1 ohm load. Get all the options on the sub except internal leads.

4. Okay got it.
5. Which one from the 1/0 do I select for everything that I need?
http://www.rockfordfosgate.com/produ...tallation-kits
6. I don't know what that means, but I'm sure the installer will. But since I am getting two Fi Q's I should select dual 1ohm or dual 2ohm?
7. I know what the specs to build for one 12 or 15 in a sealed box but what do I tell the installer for two? The referenced link I gave above on their website only shows for one sub.

Man thanks again for being patient with me, I went from knowing nothing to learning quite a lot.

[Montecristo]

Originally Posted by bmw325i

Check this out.

WOW. Talk about being underrated.

[bmw325i]

Originally Posted by Montecristo

4. Okay got it.
5. Which one from the 1/0 do I select for everything that I need?
http://www.rockfordfosgate.com/produ...tallation-kits
6. I don't know what that means, but I'm sure the installer will. But since I am getting two Fi Q's I should select dual 1ohm or dual 2ohm?
7. I know what the specs to build for one 12 or 15 in a sealed box but what do I tell the installer for two? The referenced link I gave above on their website only shows for one sub.

Man thanks again for being patient with me, I went from knowing nothing to learning quite a lot.

5. This is what I used. You'll also need a short RCA cable and if you are doing the second battery you'll need a little bit of extra ground cable and some extra ring terminals.
http://www.amazon.com/gp/aw/d/B00148Z9Y4

6. Dual 1 ohm. http://www.the12volt.com/caraudio/woofer_configurationsm.asp?Q=2&I=12#results

7. If you put your box as far forward as I did you have 14" height to work with. If you put the box a little further back in the trunk you have 16-17 inches height. Width you have 36 inches and depth can vary. Also keep in mind the partition seperating the 2 subs when you calculate your volume.
http://www.rockfordfosgate.com/rftech/box_wizard.asp

[Montecristo]

Originally Posted by bmw325i

5. This is what I used. You'll also need a short RCA cable and if you are doing the second battery you'll need a little bit of extra ground cable and some extra ring terminals.
http://www.amazon.com/gp/aw/d/B00148Z9Y4

6. Dual 1 ohm. http://www.the12volt.com/caraudio/wo...2&I=12#results

7. If you put your box as far forward as I did you have 14" height to work with. If you put the box a little further back in the trunk you have 16-17 inches height. Width you have 36 inches and depth can vary. Also keep in mind the partition seperating the 2 subs when you calculate your volume.
http://www.rockfordfosgate.com/rftech/box_wizard.asp

Okay all taken into account. So you're saying the two subs should be in two different boxes, not the same?

[bmw325i]

Originally Posted by Montecristo

Okay all taken into account. So you're saying the two subs should be in two different boxes, not the same?

Well it could be 1 box, but seperated into 2 chambers.

[Montecristo]

Originally Posted by bmw325i

Well it could be 1 box, but seperated into 2 chambers.

The box calculator site only gave a wedge as an option for two boxes, how do I calculate just a rectange? 335i is pretty square in the back

Also, is it exactly 14 inches in the back? Because the box recommendation for a sealed 12 is 14". Think it would fit snugly or just barely not fit?