Fostex BK-12m Folded Horn Kit - Pair

Fostex BK-12m – 4.5” Full-Range Folded Horn Kit

Madisound is pleased to bring you the BK12m, a high efficiency single driver speaker kit. The Fostex FE126En 4.5” Full-Range driver is combined with a custom designed folded horn enclosure. The driver is run full range without a crossover, with a very lifelike and engaging overall presentation. These speakers can be driven with very low powered amplifiers and effortlessly produce satisfying sound levels for all but the largest rooms.

The FE126En is one of, if not the most, popular full range drivers from the long running Fostex FE line. This reasonably priced driver strikes a favorable balance of physical size, high sensitivity, satisfying low end extension, sweet midrange and extended high frequency reproduction.

We would like extend a big thank you to David Dlugos of Planet_10 Hi-Fi for his time and effort in this project. The first-rate enclosure design and cabinet drawings make this a very special kit offering for the full range enthusiast. Please visit the Planet_10 Hi-Fi website to explore another world of drivers and cabinet plans.

The cabinets are locally cut by CNC machine from high quality multi-layer 5/8” Baltic Birch and delivered flat packed. The through hole for the driver is chamfered to promote optimal air flow. Wood glue, clamps and a little sand paper are all that is required for assembly. Detailed assembly instructions are also included.

Completed cabinets measure 31 5/8” tall x 7 1/4” wide x 14 1/2” deep. The unfinished/unstained wood is ready for your choice of finish. You may also choose to round over the edges if you prefer that style of appearance. High quality internal hookup wire (Supra Classic 1.6) and damping material (Acousta-Stuf) and are included with the kit purchase. The rear of the cabinet is already cut with two holes for binding posts. We recommend the Propeller Posts. Please select your preference from the drop down menu. You may also choose to cut a hole for an input cup if you prefer a flush rear of the cabinet as opposed to binding posts.

Download BK-12m Cabinet Plans

BK-12m Kit Includes:

• 2x Fostex FE126En 4.5” Full Range Drivers
• 2x Unassembled and Unfinished Baltic Birch Cabinets (Assembled measurements 31 5/8” tall x 7 1/4” wide, 14 1/2” deep)
• 3 oz. Acousta-Stuf internal damping material (dampen each driver chamber with 1.5 oz evenly distributed)
• 5 ft. Supra Classic 1.6 15 AWG Internal speaker wire
• 4x QC187 Quick Connects (2 red, 2 black)
• 8x 8X1 Socket Head Wood Screws (8x Philips Head wood screws also included)
• Assembly Instructions

Tool Required for Assembly:

• Elmer’s Wood Glue
• Sand Paper
• Bar Clamps (3x 24", 2x 36" - the more the better. Available at your local hardware store, or online at mcmaster.com)

• Select binding posts from the drop down menu above

Internal Side View of BK-12m Folded Horn Enclosure

Front Angle View of BK-12m Enclosure Partially Assembled

Rear Angle View of BK-12m Enclosure Partially Assembled

Assembled Pair of BK-12m Speakers

Fostex FE126En 4.5" Full Range Driver