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BTL-4 Series

$649.00 $499.00

Handmade in USA
Due to COVID-19 all orders can have upto 45 business days lead time

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The BTL-4 is the BTL-4

SKU: BTL4 Categories:

Why a 4” coiled BTL? Well, because we can. New for 2019 is the first 4” coiled sub in the BTL Series. The BTL4-Ferrite is the latest in the progression of Fi subwoofers geared towards thundering daily drivers. Utilizing a favorite 3 stack ferrite magnet design using US steel cut on our water jet and finish machined on our CNCs, there is plenty of motor force in the FEA derived design for both daily and SPL use. Utilizing a solid pole and a venturi aided pole profile, the forced cooling keeps thermal temperatures under control. A classic 3 stack of ferrite magnets provide the Gauss while 4 Fi designed 10″ heavy progressive spiders keep things under mechanical control. Utilizing a special 144 tinsel count leadwire that is double sewn to the spider pack, there are no losses in power transfer to the coil (available in either standard stitched with terminals or the hybrid stitched with bolted termination.

Working in ported, 4th or 6th order applications the 2019 BTL4-Ferrite Series raises the power handling and thermal performance of a classic line to new levels . As always, the BTL is “Built To Last”.

  • Dual 1 and Dual 2 Ohm

  • Extra heavy Aluminum basket

  • Wrap around gasket

  • Kraft pulp fiber reinforced cone

  • Dual layer wide foam surround

  • Standard heavy duty stitched lead or Hybrid system

  • 144 tinsel count leads

  • FEA optimized motor

  • High Flux density design

  • 4” diameter 4 layer coil (Flatwind option)

  • Triple stack magnets

  • Five  progressive spiders

  • Optional inductance/heat ring

  • Machined in house at Fi
Weight 71 lbs
Dimensions 20 × 20 × 16 in

Thiele-Small Parameters

BTL-412 BTL-415 BTL-418
Coils DUAL 1 | DUAL 2 DUAL 1 | DUAL 2 DUAL 1 | DUAL 2
Fs 27.8 Hz | 27.8 Hz 27.1 Hz | 27.2 Hz 24.8 Hz | 25.0 Hz
Re 0.7 | 1.4 0.7 | 1.4 0.7 | 1.4
Qms 6.16 | 6.16 6.71 | 6.66 7.61 | 7.59
Qes .45 | .45 .50 | .50 .56| .55
Qts .42 | .42 .46 | .46 .53 | .52
Mms 391g | 388g 439g| 430g 567g | 554g
Cms 0.86M/N | 0.86M/N 0.78M/N | 0.78M/N 0.73M/N | 0.73M/N
Sd 480cm^2 | 480cm^2 810cm^2 | 810cm^2 1210cm^2 | 1210cm^2
Vas 27.1 l | 27.1 l 71.1 l | 71.1 l 151.0 l | 151.0 l
Spl 83dB 1W/1m | 83dB 1W/1m 86.6dB 1W/1m | 86.7dB 1W/1m 88.0dB 1W/1m | 88.1dB 1W/1m
Bl 14.3 N/A | 20.2 N/A 14.3 N/A | 20.2 N/A 14.3 N/A | 20.2 N/A
Xmax 33mm (One Way) 33mm (One Way) 33mm (One Way)
Rms 3500W 3500W 3500W

Technical Specifications

BTL-412 BTL-415 BTL-418
Overall Diameter 12.500″ 15.625″ 18.500”
Cutout Diameter 11.125″ 14.125” 16.750”
Mounting Depth 9.250″ 10.250″ 12.250”
DriverDisplacement 0.18cuft 0.19cuft 0.22cuft
Sealed Box .5-1.5 cuft 1.5-2.5 cuft 2.5-4 cuft
Ported Box 1.8-2.5 cuft @ 33Hz 3-5 cuft @ 33Hz 5-7cuft @ 33Hz

This is a complete list of options; not all options are available on all models.
See drop down selections for options available with each speaker model.

Cooling Stage: The new cooling stages are aluminum rings or plugs that aid in cooling and reducing the inductance of a coil (as well as linearizing it to further reduce distortion).  The first stage is a machined aluminum sleeve over the pole.  This has better thermal conductivity than steel alone does and reduces the effect of the coils inductance increase being an iron core inductor.  The second stage includes the first pole sleeve and adds an aluminum pole cap that increases compression and cooling.  The third is the first two stages along with the large visible heatsink that surrounds the outside of the coil and transfers heat to the ambient environment as well as greatly reducing the inward inductance of the coil.  The overall effect increases cooling/thermal capacity as well as linearizing in vs outward inductance shift reducing distortion ad increasing bandwidth

Cooling: Self explanatory, the cooling channels are machined into the inside of the sub to help cool the coil FAR better. This option is available for subs that do not have staged cooling.  While it is not a visible option, it makes a huge difference in long term thermal capacity.  

High QTS: This option is for users who intend on using the subwoofer in only a sealed enclosure.

Low QTS: This option is for users who intend on using the subwoofer in only ported enclosures.

Extra Spider: This option adds an additional spider to the spider pack to help with mechanical power handling and keeping the moving assembly under control.  It can have small detrimental effects on the sound quality of the sub if the sub is made too stiff (reducing excursion ability and low frequency bandwidth).  But in some applications the losses are offset by the ability to use extra power.  An extra spider is not a bandaid for improper subsonic filter settings on your amp/DS with respect to the box tuning (should be 2-3 Hz lower than box tuning to avoid mechanical issues when the port unloads).

Internal Lead: This option is for 8 lead per coil, increasing the current flow from coil to terminals.  It is sandwiched between the spiders to keep it linear and from flopping around under extreme excursion.

Plus Coil Pack: This option adds an extra spider and the larger/higher power handling Omega/TeamV3 coil.  This well bump thermal capacity from 3500W to 4500W or more depending on other options and application.  The extra spider helps keep the additional moving mass and power under control while the coil has much higher current carrying capacity over the standard 4″ coils.

 

Speaker Terminals

We have two terminal options on selected subwoofers.

Our Standard Push terminal using 144 strand count sewn tinsel leads Or our new Hybrid+ lead system with ring terminal attachment for high power systems.

 

Dustcaps

We have 4 Dustcap options on selected subwoofers.

Our regular Dry Carbon composite dustcap and new Gloss Carbon. Both variants are available in 6″ and ‘Big’ 7″ diameters to further your customized experience with Fi.

 

Colors

We have a wide array of color options to choose from, with over 10 colors to choose from we’re sure you’ll find something to enhance the look of your Fi subwoofer.

fedex_ground

Subwoofers & Recones are dispatched via FedEx Ground. Small goods such as sticker packs, various apparel items are shipped via USPS. Upon dispatch of your goods, order status will be updated from “test/pack” to “shipped” which is accompanied with tracking details.

General Information

All orders are custom made to your selected options.  Each order is machined from raw steel and hand made after it is ordered.  This normally takes 10-15 business days, but due to unforseen issues it can take longer. We will note much of this directly on the individual product pages and try to update this weekly.  There are a couple of times a year that we simply can not keep up with sales and these “normal” time lines will not be in effect.  These times normally include Black FiDay and tax season.  During these times we will run batch orders per series and not individual orders.  This increases our overall efficiency, but can put your order into a later build date.  Fi will maintain reasonable communication should an item take longer than our normal 15 business days to make during our normal build seasons.  Often we will post through Facebook and Instagram our batch sequences to give all customers a better time line.  We also note for each item the current lead times (which can be longer than our normal 10-15 business days. Should an item take longer than normal, all refund policies still are in effect.

Delivery Location

Items offered on our website are only available for delivery to the verified billing addresses in the US and Canada. We also accept orders from international customers who are shipping to addresses on an individual basis.  All items will ship direct from our Las Vegas, Nevada location.

Delivery Time

An estimated delivery time will be provided to you once your order is placed. Delivery times are estimates and commence from the date of shipping, rather than the date of order. Delivery times are to be used as a guide only and are subject to the acceptance and approval of your order.  Deliveries will be made through FedEx Ground unless otherwise noted.  Delivery times in the US generally take from 1 to 5 business days depending on how far you are from our facility in Las Vegas, Nevada

Unless there are exceptional circumstances, we make every effort to fulfill your order within [15] business days of the date of your order. Business day mean Monday to Friday, except holidays.

Date of delivery may vary due to carrier shipping practices, delivery location, method of delivery, and the items ordered. Products may also be delivered in separate shipments.

Delivery Instructions

We will only ship to the customers billing address.  No exceptions.  All orders are shipped with direct signature required.  We will not ship orders without direct signature, sorry if this causes any inconvenience.  Fedex will send an email to your customer supplied email address once the order has shipped.  This normally happens after 6PM PST on the day it is picked up.

Shipping Costs

Shipping costs are based on the weight of your order and the delivery method. To find out how much your order will cost, simple add the items you would like to purchase to your cart, and proceed to the checkout page. Once at the checkout screen, shipping charges will be displayed.

Additional shipping charges may apply to remote areas or for large or heavy items. You will be advised of any charges on the checkout page.  

All shipping rates are pulled directly from our FedEx rate chart.  We do not charge extra over our actual cost from FedEx.  Fi also pays from its own pocket for DSR (Direct Signature Required) and Insurance for any order over $500.

Damaged Items in Transport

If there is any damage to the packaging on delivery, contact us immediately.  A claim will need to be filed with Fedex.  In contacting us please have your order number (it has been emailed to you and is on the shipping label) and your tracking number (emailed to you and on the shipping label) ready to expedite the claims policy.

Questions

If you have any questions about the delivery and shipment or your order, please contact us.

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