Fi BL 15

[Hzd Skizzy 27]

What are some optimal dimensions for a box for a Fi BL 15. I really want "SQL". Need to know how many drivers port area port length tuning frequency. (W x H x D)

Thanks for the help.

[stevemead08 752]

READ! have you checked the fi website? or read the noob user guidelines for that matter?

[stevemead08 752]

START HERE

BL

Available options and what they do:

The BL line is pretty much a lower power alternative to a BTL or a higher power alternative to the Q series of woofers. This is more of a street jamming type woofer that “fills the gap” if you will between these two series of subs. Keep in mind this is what we recommend, this is NOT what you have to do.

P Chamfer: This is a chamfer on the end of the pole, it helps to bring the air down around inside of the motor and helps cool the coil better. It also helps relieve the pressure underneath the dustcap. We recommend at the bare minimum to get this option if you choose this series of woofers.

Hyper Pole: This is an extended version of the standard P Chamfer. It has 1.250” more pole and chamfer resulting in an increased compression ratio for better cooling.

Cooling: Self explanatory, the cooling channels are machined into the inside of the sub to help cool the coil FAR better. But there are some things that you sacrifice. There is less metal inside of the motor so it is a little weaker. If you are looking for a fart/burp only scenario for SPL we suggest that you do NOT get this option. Stick with only the P chamfer. Now if you are looking for a daily sub to beat on and you have less then 2000 watts then this is the option for you. 2000+ watts you need to look into the BTL series.

Flatwind: The flatwire coil option simply helps the power handling of the sub. The coil has more surface area to dissipate heat and will take more power then the regular round wire coil that comes in the ‘stock’ version of the sub. This option will also make the sub tend to be more prone to ‘peaking’. If you are looking to do an SPL install we highly recommend that you use choose the flatwound coil option. In testing it is louder then the regular roundwire coil and takes the thermal abuse much better.

Daily or SPL: Simply put, if you plan on listening to any type of music you MUST choose the daily option. If it is strictly for a fart/burp scenario then choose the SPL option. The reason we have these options is the gap tolerances between the two are different. The gap in the SPL woofer is much tighter and FAR less forgiving in comparison to the Daily option. The Daily option simply gives the coil more wiggle room inside of the gap to deal with the non-linearity tendancys that you can get into when you are using a sub in a daily driving scenario. Typically SPL applications deal with 1 note and it does not change, therefore we can make the gap much tighter and get all of the motor strength that we can out of it.

Extreme Lead: ONLY choose this option if you plan to use the woofer for SPL ONLY applications. This option tends to yield really bad tinsel slap and rubs holes in the spiders (especially on the 10’s and 12’s) it is not intended on using in a daily driving scenario.

Universal: This option gives you the choice to later chance the impedence of your voice coils. You can change from dual 2’s to dual 1’s and vice versa by reconing them. If you do not choose this option your motor(s) will be optimized per the coil resistance that you have chosen. (Dual 2’s will forever be a dual 2 motor, Dual 1 will forever be a Dual 1 motor).

Enclosures:

First off we do not recommend using a sealed box for any of the BL or BTL series of woofers

BL 10 – Ported box we recommend using .5-1.2 cubic feet from 30-37Hz tuning with ~15 square inches of vent. (IMO 32hz tuning daily driving is optimal)

BL 12 – Ported box we recommend using 1.8-2.5 cubic feet @ 30-37Hz (I personally think that a 32hz tuning is optimal, and has the most output and is still the most musical daily driving). Use 12-16 square inches of vent area per cubic foot of volume.

BL 15 – Ported box we recommend using 2.8-4 cubic feet @ 28-37Hz. Again use 12-16 square inches of vent area per cubic foot of volume.

BL 18 – Ported box we recommend using 5-10 cubic feet @ 30-37Hz tuning, you can tune a little higher if you wish but we recommend keeping it close to 32hz for a daily driver. Again the same 12-16 square inches of volume applies per cubic foot of volume.

[Julian 641]

What are some optimal dimensions for a box for a Fi BL 15. I really want "SQL". Need to know how many drivers port area port length tuning frequency. (W x H x D)

Thanks for the help.

First off we need YOUR max dimensions, second, SQL does not exist SQ and SPL are two different things.

[Hzd Skizzy 27]

thanks steve i have read that many times but according to my first post i asked for a little more than that. im tired of figuring this out by myself so i came for a little more help. too much to ask?

Julian: are you asking for how much space i have?

[stevemead08 752]

were all here to help but nobody is going to do it for you. ask specific questions and give as much info as you can. car, max space you have, equipment goals...ect

[Hzd Skizzy 27]

2003 Eclipse GS and for max space all i know for now is it has 17^3 so i believe thats plenty right? i want good sound quality and i want it to be loud too. SQ>SPL though. need anything else?

[stevemead08 752]

Dude. if you want help building a box then get off your butt, grab a tape measure, and go take some measurments of your trunk! not trying to be a dick but come on man, help out a little.

[Sir-Lancelot 216]

FAIL!

I want a box too, just make me one like that guy on youtube.

[Hzd Skizzy 27]

Dude. if you want help building a box then get off your butt, grab a tape measure, and go take some measurments of your trunk! not trying to be a dick but come on man, help out a little.

what the fuck is your problem dude i said i dont know at the moment because my car is in the shop because im getting a new exhaust system in it and cool air intake and a tune up. Thats why i cant do it at the moment. Didnt know there had to be a reason for everything but there it is. Don't say your not trying to be a dick because clearly you are.

[stevemead08 752]

Wow! Good luck!

[tysonm 0]

Hahah hope you got all the help you needed because by the looks of it, that's about all the help you're going to get. GL

[Hzd Skizzy 27]

dont worry i already got more reliable sources for my problem

[stevemead08 752]

You dont even know what your question is!!!!!!!!!!!!! how the hell do you expect to get an answer?

[ralstonballa2413 20]

You aren't going to find too many more reliable sources than you can get here. To help answer your original question. There is no optimal dimensions it is about optimal volume and tuning for what you are trying to install it in and and how you want it to sound. The recommendations that were posted here tell you exactly what you are after. You just need to crunch the numbers to get the volume desired to fit in your car. The tuning will be good around the 32hz area. We can not tell you port dimensions or port length without know the dimensions of the box you can fit. The number of drivers is also something that we can not help you with as that is a preference that only you can decide on. If this did not answer your questions then let me know what I missed and I will try to answer it for you. People enjoy helping out here but not spoon feeding so please give us as much information as possible on your next post.

Edited July 14, 2010 by Miller

[slim2fattycake 85]

Well put, miller.

OP, send me 15 bucks and I'll get you a design.