HiFi fullrange driver - the largest one we fit into any engine
Linear frequency response between 200 and 20000 Hz.  Ideal speaker for the model field.

Spezial Attributes:
- Moisturized cone
- Metal masket


Specifications:
Size: 3 1/8" x 3 1/8"
Mounting Hole: (ctr-ctr) 2 13/16"
Height: 1 19/32"
Rated power 30 W
Maximum power 50 W
Nominal impedance Z 8 Ohm
Frequency response 100–20000 Hz
Mean sound pressure level 82 dB (1 W/1 m)
Opening angle (-6 dB) 180°/4000 Hz
Excursion limit +/−2,5 mm
Resonance frequency fs 120 Hz
Magnetic induction 0,8 T
Magnetic flux 200 µWb
Height of front pole-plate 4 mm
Voice coil diameter 20 mm
Height of winding 4,5 mm
Cutout diameter 73 mm
Net weight 0,28 kg
D.C. resistance Rdc 7,2 Ohm
Mechanical Q factor Qms 4,85
Electrical Q factor Qes 1,32
Total Q factor Qts 1,04
Equivalent volume Vas 0,9 l
Effective piston area Sd 31 cm²
Dynamically moved mass Mms 2,5 g
Force factor Bxl 3,2 T m
Inductance of the voice coil L 0,9 mH
Temperature range −13 ... 158 °F

This speaker is made in Germany by the German manufacturer Visaton, a company that I personally know for more than 30 years. I build my first studio speakers with speakers from Visaton and they lasted for 15 years until I sold them - and they probably perform still today. So it is no surprise, when entering into the garden railroad sounds, I found Visaton again - and they are great!