The Scan-speak 23W/4557T is a very high end subwoofer, designed to be used with a passive radiator in a small enclosure. This sub has a very rigid aluminum cone, low loss rubber surround and cast frame. The passive radiator is similar, but with a weight attached to the bass of the cone. The 23W/4557T is using the SD-1 motor system. There are gold plated binding posts and the woofer is covered by a decorative rubber cap. Frequency response with the passive is down to 25Hz. One cubic foot sealed has an F3 of 33Hz.
TECHNICAL DATA: Sensitivity 2.83V/1M 82 dB Free air resonance Fs 20.5 Hz DC resistance 3.45 ohm V.C. inductance 0.45 mH Power 225 W Effective cone area 232 cm2 V.C. diameter 50 mm VC height - Air gap -
Lin. & max. excursion ±13 / ±20 mm Air gap flux density - Force factor BL Product 9.3 Tm Moving mass incl. air 101 g Net weight 4.6 kg Vas 45.6 ltrs Qms 4.8 Qes 0.52 Qts 0.47