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SB15SFCR-00 / 5″ x 8″ Paper Passive Radiator
 
Features
Racetrack design
Hard paper cone (made in-house)
Low damping rubber surround
Symmetric suspension
Easily adjustable moving mass
 
Specs
Effective piston area, Sd 178 cm2
Free air resonance, Fs 21 Hz
Compliance, Cms 0.93 mm/N
Moving mass incl. air,Mms 62 g
Maximum mechanical cone excursion,Xmech ±11 mm
Mechanical loss, Rms 0.48 kg/s
Mechanical Q-factor, Qms 2.7
Equivalent volume, Vas 41.8 liters
Net weight 282 g
 
https://sbacoustics.com/wp-content/uploads/2020/11/5x8in-SB15SFCR-00.pdf