These speakers are based on the TL concept, the goal is to substitute a pair of high end loudspeakers.
On this project, only high quality, top of the line transducers were used, so high levels of quality could be achieved.
Based on a design already tested on one of our friend’s project Bestialf but down scaled to fit the woofer size intended to use..
Once finished the drawings, it was observed that a certain lack of purity on the region of the lowest octave, so relocating the woofer unit within the TL was done, reaching after said modification far better results than with the original placement of the woofer.
Original Design Modified design
Once corrected the (presumed) error, it was time to proceed with different configurations trying to get a common reference to apply to other TL designs. Doing so, it was possible to learn wich could be the right shape of the TL and the woofer’s placement within.Reached this point with satisfactory results, the next step was to get serious and start building what up until now was just a prototype with numerous modifications along the way.
We won’t explain at lenght about the assemblings techniques or the technology behind the speakers, since we have already as a reference the a.m. Bestialf wich are a great example of a high end construction, design and use of transducers.This particular TL is built using 25 mm MDF panels for top, bottom, rear and sides of the box, adding to it a 10mm thick layer wooden cardboard, so the total thickness becomes 35 mm. The front is made of double layer MDF for a total of 50mm thickness.
TL view (a) TL view (b)The interior design was done trying to have a continuos diminishing line from the woofer toward the opening baffle. On all corners, the line’s sharp angles were softened using asphalt fabric, increasing the air flow while damping the line within.
All empty spaces (or dead spaces) were filled with a mix of sandwood and white carpenter glue to avoid as much as possible unwanted vibrations, although the entire inner portion of the line is also built using 25 mm MDF.
Corner fillings and asphalt fabric reinforcements
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Tweeter: Seas Millenium T25CF002 (as used by Linkwitz on his Orion)
Midband: Audio Technology CQuence 15 H (as used on the Sonus Faber Stradivari)
Woofer: Scan Speak 26W / 8861T00 ( Revelator’s line best woofer from SS)
The speaker’s crossover frecuencies are 300hz and 3000 hz using 24db/octave filters generated by Behringer Ultra Drive Pro DCX 2496.One of the difficulties is to find the correct material to use for damping the box, so the best response can be had, specially on the low frecuencies. It wasn’t easy, but after a good handful of trials, measuring, testing, etc. this is the solution finally adopted:
Damping material with wich the best response was experienced
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After considering several finishes and having tried some on testing material, I chose using a piano gloss black finishing for my boxes. As you might be able to see, the stand is also DIY and were constructed using 6mm solid steel plates welded on the angles, while the spykes are made using 60x8mm (lxd) bolts, its coned shape was made using a roundel machine.
Stand view
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Some of the graphs taken while adjusting the crossover, phasing, angle and delays.
Graph showing light EQ use
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The final result and its conclusions lead us to be certain that for some less than Eur 2k and some (n.t. “a lot”) patience, a great pair of speakers can be built, capable of standing its own against some of the market’s references at prices that are many times this figure. Its use is reccomended for rooms no larger than 20-30 sqm where a great, solid bass and good dynamics as well as a neutral timbrical balance is desired.
Signed: Edu The Mob Killer