winisd help

[chefboyrlee]

do i have to convert measurement into metric units to use winisd? i can figure the conversions out when it comes to the box, but when it comes to inputting speaker specs i'm lost.
can someone clarify a bit for me or be kind enough to tell me what to input for an SX 12.

Qts:
Vas:
Fs:
Re:
Le:
Xmax:
Z:
Qms:
Qes:
SPL:
Pe:
BL:
dia:
Sd:

[chefboyrlee]

grrrr, aside from a few specs no unit of measurement is used on RE's site.

[chefboyrlee]

narrowing them down...
does anyone know what unit of measurement:
Vas, RE site listed at 47.6
Sd, RE site listed at 480