Visaton K 50 SQ 8 Ohm, 2 Inch, Miniature Speaker
Product photo · Enlarge image
Product photo
Rear view and connections
Dimension drawing
Response and impedance
Directivity pattern (K 50 measurement)
Product photographs and manufacturer drawings. Images are not to scale.
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The K 50 SQ is a 5 cm miniature speaker with a Mylar diaphragm in a square metal basket with four mounting holes and a foam gasket, made for voice and signal output in machines and equipment indoors and outdoors. The 8 Ω unit handles 2 W rated power and has 2.8 x 0.5 mm contact pins. Its IP65 front-side protection applies when it is built into a sealed enclosure.
Typical applications
- Voice and signal output in machines
- Indoor and outdoor equipment
- Rail and transport equipment
Full specifications
| Rated power | 2 W |
|---|---|
| Nominal impedance | 8 Ω |
| Frequency response (−10 dB) | 250–10000 Hz |
| Mean sound pressure level | 83 dB (1 W/1 m) |
| Opening angle (-6 dB) | 180°/4000 Hz |
| Excursion limit | ±1 mm |
| Resonance frequency fs | 480 Hz |
| Height of front pole-plate | 2 mm |
| Voice coil diameter | 14 mm |
| Height of winding | 3 mm |
| Cut-out | 45 mm |
| Net weight | 0.05 kg |
| D.C. resistance Rdc | 7.3 Ω |
| Mechanical Q factor Qms | 6.42 |
| Electrical Q factor Qes | 7.32 |
| Total Q factor Qts | 3.42 |
| Equivalent volume Vas | 0.06 l |
| Effective piston area Sd | 12.5 cm² |
| Dynamically moved mass Mms | 0.4 g |
| Force factor Bxl | 1.12 T m |
| Terminals | 2.8 x 0.5 mm (+)/2.8 x 0.5 mm (-) |
| Protective system | IP65 — front side in a sealed enclosure |
| Temperature range | −40 to 80 °C |
Dimensions and drawings

Dimension drawing · Open original image
Installation and cabinet guidance
Allow for a 45 mm opening and the 51 mm square frame, with four 4.3 mm fixing holes on a 40 mm pitch. Leave about 20 mm behind the panel for the magnet and contact pins.
Compress the foam gasket evenly against a flat panel so the front-side protection is effective; bonding and a front cover or grille may be needed.
Use connectors that fit the 2.8 x 0.5 mm pins, observe polarity and keep the drive within the 2 W rating from an output stage suitable for the 8 Ω load.
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