Frugel-Horn kits include everything you need to build your speakers except for drivers, glue, clamps, and finishing supplies. The kit includes two speakers, the attached photo shows the parts for one of the speakers.
In late 2006 – ’07 a small group of enthusiasts collaborated to develop a compact, inexpensive corner-horn design for the DIY community. This project became the very successful Frugel-Horn, which even spawned an extremely expensive commercial adaptation. The Frugel-Horn Mk3 [FH3] is a well-tested design, with the objectives of improving upon the performance of the original box in a substantially simpler cabinet that would be tolerant of a wide range of drive units.
Topologically, it is a tapped hypex corner-horn (approximated by 2 conical sections) with an internal choke serving as a low pass filter. The curved terminus is carried over from Ron Clarke's contribution to the original cabinet and helps the wavefront exiting the horn mouth to return to its more natural spherical shape.
The cabinet has to date been successfully tested with Fostex FE126En, FE126e, FE127e, FF105wk, FF125wk, FE138eSR*, Mark Audio CHR-70, CHP-70, Alpair7, A7.3, A7p, Pluvia Seven, CSS EL70, Tang Band W5-1611, more. Any 4-5" (100-130mm) driver is worth trying. Adjustment & tuning of the cabinet is accomplished with varying amounts of damping, and proximity to rear boundary walls / corners.
FH3 is made freely available for DIY builders to make their own cabinets; we see it as an introduction to back-loaded horns, from which people may wish in future to move on to larger and / or more complicated designs.
This is not my design. For the full history, creators of, and plans for this fine loudspeaker please visit www.Frugal-horn.com.
Other drivers can be used, please email me with questions or requests at firstname.lastname@example.org.