Congratulations on your new Soundstream sub-woofer purchase. We greatly appreciate your business. This may look like is a run of the mill cardboard box, but is actually a protective barrier over one of the finest engineered and assembled subwoofer available. Harmonic Indulgence… Listen and Feel series wired R1-12L R1-15L Fs 21.50 23.7 Qms 9.210 13.4 Vas (ft^3) 2.863 4.825 Cms (mm/N) .220 .14 Mms (g) 249.5 317.2 Rms (kg/s) 3.654 3.52 Xmax (mm) 12.70 12.7 Sd (in^2) 79.16 127.
