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Visaton G 20 SC 8 Ohm, 0.8 Inch, High-End Dome Tweeter

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G 20 SC · 8 Ω · part 1185 — Product photo

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G 20 SC · 8 Ω · part 1185 — Product photo Product photo G 20 SC · 8 Ω · part 1185 — Rear view and connections Rear view and connections G 20 SC · 8 Ω · part 1185 — Dimension drawing Dimension drawing G 20 SC · 8 Ω · part 1185 — Response and impedance Response and impedance G 20 SC · 8 Ω · part 1185 — Directivity pattern Directivity pattern

Product photographs and manufacturer drawings. Images are not to scale.

G 20 SC · 8 Ω · part 1185 — Product photo

Product photo

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Part number: 1185

A magnetically shielded 20 mm high-end textile dome tweeter with excellent dispersion for hi-fi speakers.

Nominal size
20 mm / 0.8 inch
Impedance
8 Ω
Rated power
80 W (12 dB/oct. high-pass from 2000 Hz)
Cut-out
66 mm
Sensitivity
88 dB (1 W/1 m)
Resonance
1890 Hz
£52.95 Business price, ex VAT £63.54 inc VAT at 20%
Maximum quantity available reached.

Description

The G 20 SC has an optimised textile dome with damping felt on the pole piece, giving a balanced, resonance-free response and wide dispersion. Its ferrofluid-cooled voice coil and strong magnet drive give high efficiency, and the shielded magnet allows use close to a screen. This 8 Ω version takes 80 W with a 12 dB/oct. high-pass from 2000 Hz and resonates at 1890 Hz.

Typical applications

  • High-end hi-fi systems
  • Tweeter for multi-way hi-fi speakers
  • Speaker kit builds
Full specifications
G 20 SC · 8 Ω
Rated power80 W (12 dB/oct. high-pass from 2000 Hz) / 120 W (12 dB/oct. high-pass from 4000 Hz)
Maximum power140 W (12 dB/oct. high-pass from 2000 Hz) / 180 W (12 dB/oct. high-pass from 4000 Hz)
Nominal impedance8 Ω
Frequency response (−10 dB)1200–30000 Hz
Mean sound pressure level88 dB (1 W/1 m)
Opening angle (-6 dB)180°/8000 Hz
Resonance frequency fs1890 Hz
Magnetic induction1.3 T
Magnetic flux200 µWb
Height of front pole-plate2.5 mm
Voice coil diameter20 mm
Height of winding2 mm
Cut-out66 mm
Net weight0.39 kg
D.C. resistance Rdc4.8 Ω
Mechanical Q factor Qms0.36
Electrical Q factor Qes1.34
Total Q factor Qts0.28
Effective piston area Sd4 cm²
Dynamically moved mass Mms0.15 g
Inductance of the voice coil L0.02 mH
Terminals4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Dimensions and drawings
G 20 SC · 8 Ω · part 1185 — Dimension drawing

Dimension drawing · Open original image

Installation and cabinet guidance

Allow a 66 mm panel opening. The round faceplate is 94 mm in diameter, with 4 mm fixing holes on an 82 mm circle; mark them from the unit itself rather than assuming the spacing. Behind the panel allow about 27 mm for the 64 mm rear housing, plus room for the terminals and the wiring.

Mount it on a rigid baffle with a continuous seal between the faceplate and the panel, tighten the fixings evenly and only enough to seal so the faceplate is not distorted, and keep the dome clear of any grille. Connect to the 4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-) blade terminals with matching push-on connectors and observe polarity; the two blade widths identify it. The power ratings apply only with a 12 dB/oct. high-pass filter, and they depend on where it is set: 80 W from 2000 Hz, or 120 W from 4000 Hz. Feed it through the system crossover or a high-pass filter that gives at least that protection; never connect it directly to a full-range signal. Use an amplifier suitable for the 8 Ω load. The magnet system is shielded.

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