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Speaker Projects of the Past



This is how it all began with my DIY career... way back in around 1981, I decided to build some loudspeakers myself. My first foray into the subject was one of the (few) better kits that were available at the time... the KEF Reference 104ab (Acoustic Butterworth), a two way monitor loudspeaker with T27 Tweeter, B200 Woofer and the legendary BD139 passive radiator.

It all was cased up in a monstrous double wall, sand filled case with a seperate tweeter cabinet... 65 kgs of the enthusiasm of the youth! Powered by a pair of used Hitachi amplifiers it gave me the first glimpse of Hifi.




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One of the next loudspeaker projects was a huge monitor with a Tannoy 15" Coaxial-chassis. They resided in 180L reflex cabinets that never made it into the finishing phase... hence no images. And either the bass reflex tuning was off or the loudspeakers too big for my room... they never really grew on me other than being impressive.


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After another loudspeaker project sporting two Vifa midwoofers, a 76mm Vifa dome and matching tweeter things started to become a bit more serious. Around the early 90ies I was getting tired of hand calculating crossover networks with all the guesswork involved and equally unpredictable results so eventually got my hands on the first simulation software (Audiocad and SPEAKER PRO). This was a small step forward... with even generating frequency response curves manually from published curves in the available magazines!


Since simulating loudspeakers can reliably only be achieved with real measurement data not too long after I aquired a PC based CLIO measurement  and LSPCAD simulation software to model the crossovers. Some of the results were these:



Audyn Two-Way with Eton 7-360 HEX and Dynaudio D28Audyn Two-Way with Eton 7-360 HEX and Dynaudio D28


Hifonics SubwooferHifonics Subwoofer



Visaton BGS10 and AL130Visaton BGS10 and AL130



The Focal Two Way in the image above (dubbed Stixx Nr. 1) was designed in 2000 with a CAD-modelled front panel (3D data done in Alias Wavefront) that was cast using aluminum-particle filled resin; sporting up to 60mm wall thickness and cast-in threaded inserts to mount the chassis. This sure was the strongest case I ever built, though not the heaviest.

The Focal midbass was working in a 16L reflex cabinet, with the LSPCAD optimized crossover network crossing the drivers over at around 2.5kHz. They had a nice and flat frequency response and are making music to this day in a friend's house.



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