Partiamo da qui:
http://www.tonequest.com/articles/dr-z.htm
e da un paio di immagini della cassa, sia vista sul frontale sua dal posteriore:Now, our Theile ported 2x12 cabinet…far be it for me to blow my own horn, but I haven’t heard a better sounding 2x12 cabinet. I’ve never seen a 2x12 Theile ported cab—the single 12 has been done before, and I thought that if 1x12 sounds good, then 2x12’s will sound even better. The key to the Theile port design is that it does have a shelf as well as a port, and by adjusting the shelf width you can adjust the midrange response of the cabinet, and by adjusting the depth of the port, you adjust the low-end response. By selecting the driver, you also determine the treble response. So I can really dial in the cabinet to accentuate or balance whatever frequencies I want just by the way that cabinet is built, and I tune it to 30Hz. There are bass players that use our 2x12 cabinet and they are loaded with 2 heavy drivers. That’s a little bit low for guitar players, but there are still beat notes and harmonics generated that now come out clear and don’t turn to mud like they do with other cabs. The horizontal front port also gives you the ambiance of an open-backed cabinet, because you hear what’s coming out of the cones, and then you hear what’s coming out of the port, like the sound that’s coming out of the back and around the cabinet in an open-back design. So it does have a nice ambiance, and it’s not as focused and beamy as a 4x12.
Come vedete assomiglia molto alla ElectroVoice TL806 che fu progettata specificamente per i EVM12L:
Il cui progetto originale è qui:
http://hf-antenna.com/Flotsam/EV/ElectroVoice_TL806.pdf
A cui bisogna raddoppiare la larghezza come se le due casse 1x12" fossero accoppiate senza parete centrale.
La costruzione non è complicata, io feci una cassa da basso così anni fa
(a dire il vero era una TQWT), e funzionano alla grande!
)
