21/11/2012-00:22:41
RE: Nouveau Altec 604 EII alnico
Pas tout a fait. Le pot casting du Alnico Y est pour de quoi.
"OK, here's the deal:
1. The large pot casting on the large format drivers reduces the mechanical resonance to a point way below the lowest USABLE crossover.
2. This results in NO audible sub-harmonic distortion being generated by the mechanical portion of the driver.
3. If you remove the large pot casting, as Bill Hayes and his team at Altec did when they were developing the ceramic 288's in Anaheim, it sounds AWFUL! This is because the large internal volume, as Jerry Hubbard will tell you also (they found out the same thing in OKC when they were looking to improve the 288 and came up with the 299), is essential to preventing subharmonic's from setting themselves up as fundamentals and generating all kinds of ugly distortion.
In short, YES the large format drivers with the large pot casting DO have less distortion - irrespective of their crossover frequency or the bandwidth they are being asked to produce - than do the IDENTICAL units WITHOUT the pot casting."
"OK, here's the deal:
1. The large pot casting on the large format drivers reduces the mechanical resonance to a point way below the lowest USABLE crossover.
2. This results in NO audible sub-harmonic distortion being generated by the mechanical portion of the driver.
3. If you remove the large pot casting, as Bill Hayes and his team at Altec did when they were developing the ceramic 288's in Anaheim, it sounds AWFUL! This is because the large internal volume, as Jerry Hubbard will tell you also (they found out the same thing in OKC when they were looking to improve the 288 and came up with the 299), is essential to preventing subharmonic's from setting themselves up as fundamentals and generating all kinds of ugly distortion.
In short, YES the large format drivers with the large pot casting DO have less distortion - irrespective of their crossover frequency or the bandwidth they are being asked to produce - than do the IDENTICAL units WITHOUT the pot casting."