17 cm (6.5") HiFi woofer with coated paper cone, powerful drive and extended rear pole plate. Special voice-coil and elastic rubber surround for long strokes.
 
| Technical Data: | 
|---|
                                                   | Rated power | 50 W | 
                        | Maximum power | 80 W | 
                                 | Nominal impedance Z | 8 Ohm | 
                                  | Frequency response | fu–8000 Hz | 
                            | (fu: Lower cut-off frequency depending on cabinet) | . | 
                        | Mean sound pressure level | 86 dB (1 W/1 m) | 
                             | Opening angle (-6 dB) | 72°/4000 Hz | 
                             | Excursion limit | +/−10 mm | 
                        | Resonance frequency fs | 36 Hz | 
                        | Magnetic induction | 1,0 T | 
                        | Magnetic flux | 314 µWb | 
                        | Height of front pole-plate | 4 mm | 
                        | Voice coil diameter | 25 mm | 
                        | Height of winding | 12,5 mm | 
                        | Cutout diameter | 148 mm | 
                        | Net weight | 1,1 kg | 
                        | D.C. resistance Rdc | 5,9 Ohm | 
                        | Mechanical Q factor Qms | 2,43 | 
                        | Electrical Q factor Qes | 0,66 | 
                        | Total Q factor Qts | 0,52 | 
                        | Equivalent volume Vas | 38 l | 
                        | Effective piston area Sd | 129 cm² | 
                        | Dynamically moved mass Mms | 13 g | 
                        | Force factor Bxl | 5,4 Tm | 
                        | Inductance of the voice coil L | 1,2 mH |