Visaton FRS 7 S 8 Ohm, 2.5 Inch, Full Range Speaker
FRS 7 family front view · Enlarge image
FRS 7 family front view
Rear view
Dimension drawing
Response and impedance · 8 Ω
Directivity pattern
Product photographs and manufacturer drawings. Images are not to scale.
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The FRS 7 S uses a compact round cone in a square mounting frame. Its broad response suits built-in audio and small column systems where a modest driver diameter helps keep the enclosure narrow.
Typical applications
- Built-in music and speech reproduction
- Small column loudspeakers and compact enclosures
Full specifications
| Rated power | 8 W |
|---|---|
| Maximum power | 15 W |
| Nominal impedance | 8 Ω |
| Frequency response | 120–20000 Hz |
| Mean sound pressure level | 84 dB (1 W/1 m) |
| Opening angle (-6 dB) | 149°/4000 Hz |
| Excursion limit | +/−1.5 mm |
| Resonance frequency fs | 150 Hz |
| Magnetic induction | 1.2 T |
| Magnetic flux | 160 µWb |
| Height of front pole-plate | 2 mm |
| Voice coil diameter | 14 mm |
| Height of winding | 5 mm |
| Cutout diameter | 61 mm |
| Net weight | 0.2 kg |
| D.C. resistance Rdc | 7.2 Ω |
| Mechanical Q factor Qms | 5.38 |
| Electrical Q factor Qes | 2.01 |
| Total Q factor Qts | 1.46 |
| Equivalent volume Vas | 0.9 l |
| Effective piston area Sd | 22 cm² |
| Dynamically moved mass Mms | 0.8 g |
| Force factor Bxl | 1.8 Tm |
| Inductance of the voice coil L | 0.6 mH |
| Connections | 2.8 x 0.5 mm (+)/2.8 x 0.5 mm (-) |
| Temperature range | −25 to 100 °C |
Dimensions and drawings

Dimension drawing · Open original image
Installation and cabinet guidance
Check the 61 mm cut-out and fixing pattern against the drawing; allow space for the magnet and leads.
Connect to a suitable 8 Ω amplifier and maintain polarity across multiple drivers. A 100 V line installation requires a correctly rated matching transformer.
Seal the frame to the baffle and use an enclosure appropriate to the required sound level and bass response. Grilles are separate accessories.
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