a response from Rob Gillum to a question i had asked him
The CS3.7 cabinet is pressurized from the woofer and it is
true that if there is an air leak between the main cabinet and the coax
chamber, it will cause unwanted pressure to the coax midrange. This can cause
the midrange driver excursion to be greater, which in turn will cause the
midrange to fail. To check for the leak, you can gently push in on the woofer
and Passive diaphragms at the same time. This will pressurize the cabinet, and
no movement should come from the coax midrange. The midrange diaphragm is
connected to the coil former via 25 points of a special adhesive. If the CS3.7
is driven hard, then it is possible for the glue joints to break. If only a few
break, then the end result is distortion. If many of the glue joints break,
then the excursion will become great enough for the lead wires to the mid to
break. This will render a dead mid.
When sealing the coax chamber, use a caulk containing
silicone. Door and window. There are two pieces of tubing which carry the wires
into the chamber. Make sure that the wire tubing is not leaking as well. At the
factory, we injected some hotmelt into the tubes to seal the wires. Also make
sure that the tubing is not leaking around the holes in the divider.