I don’t hear a lot
said about passive radiator speaker technology. What are pros and cons
of that design? Technically, it’s still a sealed-box design and should
have some benefits over a ported design, right?Via SOS web site
SOS
Technical Editor Hugh Robjohns replies:
A passive radiator speaker is
a sealed box insofar as you couldn’t easily pour a pint of beer into the
thing (should the madness take you), but as far as the air movement is
concerned it isn’t really sealed at all, because the internal
air-pressure changes are still relieved by the passive radiator moving
in and out.
The
Mackie HR 824 MkII is one of the the few compact studio monitors that
currently uses a passive radiator, located on the rear panel behind the
amplifier chassis.
What the passive radiator does, basically, is
create a larger port area, without the airflow noises that might
otherwise occur, and help control the frequency range over which the
port is effective. More swings and roundabouts, really, but it
definitely falls into the vented box camp, and doesn’t have any of the
positive time-domain benefits of the sealed-box team.
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