The 1530 is a high performance bass and mid range driver. It has a large magnet, resulting in a high Bl product, with high sensitivity and power handling. General specifications Nominal diameter (mm/in) 381/15 Power Rating (AES, W rms) 400 Nominal impedance (�) 8 Voice coil diameter (mm/in) 76/3 Magnet type Ceramic Magnet weight (kg/oz) 2.44/86 Chassis type Pressed steel Sensitivity (dB) 99 Frequency range (Hz) 40-3000 Coil material Round copper Former material Polyimide Cone material Kevlar loaded paper Surround material Cloth-sealed Suspension Single Xmax (mm/in) 2.0/0.08 Gap depth (mm/in) 8.0/0.31 Voice coil winding width (mm/in) 12.0/0.47 Small Signal Parameters D (m/in) 0.33/12.99 Fs (Hz) 45 Mmd (g/oz) 77.70/2.74 Mair Qms 4.20 Qes 0.42 Qts 0.38 Re (�) 5.70 Vas (lt/ft3) 141.2/4.99 BI (Tm) 18.70 Cms (mm/N) 0.14 Rms (kg/s) 6.13 Le (mH) Mounting Information Overall diameter (mm/in) 385/15.16 Overall depth (mm/in) 163/6.42 Cut-out diameter (mm/in) 352/13.86 Mounting slot dimensions (mm/in) 9.2 x 6.2/0.36 x 0.24 Number of mounting slots 8 Mounting slot PCD range (mm/in) 369/14.56 Unit weight (kg/lb) 6.1/13.4 Packed Dimensions and Weight Single pack size W x D x H (mm/in) 410 x 410 x 180/16.1 x 16.1 x 7.1 Single pack weight (kg/lb) 8/17.6 Multipack (45) size W x D x H (mm/in) 1200 x 1000 x 980/47.2 x 39.4 x 38.6 Multipack (45) weight (kg/lb) 370/816