The TLAH combines the features of line array, transmission line and horn-loaded enclosures in an easy to build cabinet. Only 40 inches high, and extending less than eight inches into the room, these speakers project a huge soundstage similar to that formerly available only with large horns. The triangular version shown may be mounted a room corner, or hung mid wall. The rectangular version may be wall hung or floor standing. Both versions are included in the plans. Either makes a perfect main speaker system to compliment any of our home theater subs.

Here’s a review from builder Line92:

I have big faith in BFM designs thanks to a couple of builds so far and i really wanted to hear this type of speaker design for home/hi-fi use, so I built myself the TLAH. I used the cheapest drivers I could find, the GRS 4PF-8 and Goldwood GT-302, and bought filter components from a local shop. This weekend I brought them to the local hifi/car audio store to test them in an acoustically better room than I have. Room was around 5 x 6m (16 x 19ft). I put on Eagles Hotel California on their Polk R600 and we sat down and enjoyed it for about half the song, and then with a button we switched to the TLAH, and his jaw literally dropped, he actually said "are you kidding me?" He could not believe how amazing the TLAH sounded. The sound was no longer muddy or damped, the sound stage just exploded out and filled the room with real instruments, speakers disappeared and the music and voices truly came alive! The difference is actually like the Polk R600 had someone standing in front of them blocking the sound compared to the TLAH, where the sound opens up and everything is in place. The clarity of the TLAH is in another dimension that neither me or anyone at the shop had ever experienced before. Deployed in a good room, the sound is like nothing I have ever heard before. No standard speaker sounds like this, this is what music should sound like, open, real, clear, crisp and nothing holding it back, I really love my TLAH.

Construction Degree of Difficulty: 5

Performance Quotient: 10

Equivalent Retail Value: $1699

Plans are $19.95, delivered within 24 hours as email attachment in MS Word format. 21 Pages, 48 Pictures and Diagrams.

PDF available on request. Also included is a 3D model of the cab that allows you to see every part in the closest detail.

TLAH PRO

The Pro version of TLAH uses eight 8 inch woofers and eight tweeters in an oversize version of the HT model. Standing six feet high, it may be made triangular for built in tilt down and toe in for fixed installation, or rectangular for fixed or portable use, wall hung or stand mounted. Both versions are included in the plans. Usable response extends to 50Hz, so it may be used without subs if desired.

With 102dB/watt sensitivity, and the long-throw clarity that only a line array can give, this speaker is especially well suited for permanent installations in acoustically harsh environments, such as churches and gymnasiums.

Construction Degree of Difficulty: 5

Performance Quotient: 10

Equivalent Retail Value: $2999

Plans are $19.95, delivered within 24 hours as email attachment in MS Word format. 23 Pages, 53 Pictures and Diagrams.

PDF available on request.

The TLAH and TLAH Pro are separate plans.