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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 for 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.

 

KEF Reference 104abKEF Reference 104ab

 

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 LS
Two way with Eton 7-360/37 and Dynaudio D28AUDYN LS Two way with Eton 7-360/37 and Dynaudio D28

 

 Hifonics subwoofer with GX 10 chassisHifonics subwoofer with GX 10 chassis

 

 Visaton AL130 and BGS10Visaton AL130 and BGS10

 

STIXX Nr.1 Two way with 
Focal 6K4411 and TC90STIXX Nr.1 Two way with Focal 6K4411 and TC90

 

 

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.