Why do the Transparent One speakers use a passive radiator instead of a port like most of the other speakers on the market?
Actually the Transparent One speaker design did start out to be a ported
system. However we ran into two difficulties. The first minor problem
was that when playing very low frequencies we could hear port noise, or
what is sometimes called "chuffing" from the air moving in and out of
the port. There are a number of good port designs out there that can
greatly reduce this effect with different port topologies but at some
point it is always there even if it is just a little. The second problem
was that in order to make the speakers the size we wanted and still
play down to the legitimate low frequencies we wanted, the required port
would be too large. The laws of physics wouldn't allow it. However, we
found we could fit a correctly sized passive radiator in the small
enclosure and produce the low frequencies we were looking for, so the
passive radiator design won out.