What is a passive radiator?

Our passive radiators look on the outside like just another woofer but actually they don’t have magnets or voice coils.  Passive Radiators (PRs) are cone/spider sets “tuned” to resonate at a frequency below the active woofers linear response range.  So when the woofer is producing low frequency bass sounds, its’ mated PR works in concert to produce additional bass but at even lower frequencies than the woofer. Its tuning is such that at any given instance, the combined output of the passive and the woofer adds up to the level produced by the woofer on its own at higher frequencies (above roll off).  One of the great advantages of a PR is it assumes the burden of producing lower bass tones away from the woofer thereby extending the useful life of  the system (PRs have a suspension capable of greater linear excursion and can therefore take more abuse).  The net result is that we produce amazing bass and full range from a relatively small package.