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Visaton TW 70 8 Ohm, Cone Tweeter

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TW 70 · 8 Ω · part 9002 — Product photo

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TW 70 · 8 Ω · part 9002 — Product photo Product photo TW 70 · 8 Ω · part 9002 — Dimension drawing Dimension drawing TW 70 · 8 Ω · part 9002 — Response and impedance Response and impedance TW 70 · 8 Ω · part 9002 — Directivity pattern Directivity pattern

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TW 70 · 8 Ω · part 9002 — Product photo

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Part number: 9002

A cone tweeter for the range above 5000 Hz, especially suited as a replacement unit in hi-fi speakers.

Type
Cone tweeter
Impedance
8 Ω
Rated power
80 W (12 dB/oct. high-pass from 5000 Hz)
Cut-out
64 mm
Sensitivity
90 dB (1 W/1 m)
Resonance
1500 Hz
£12.95 Business price, ex VAT £15.54 inc VAT at 20%
Maximum quantity available reached.

Description

The TW 70 uses a specially shaped basket and a sealed rear, so it needs no separate tweeter chamber inside the cabinet and gives an even response with good power handling for its size. This 8 Ω version is rated at 80 W with a 12 dB/oct. high-pass from 5000 Hz, gives 90 dB (1 W/1 m) and resonates at 1500 Hz.

Typical applications

  • Tweeter for hi-fi speakers
  • Replacement tweeter for hi-fi speakers
Full specifications
TW 70 · 8 Ω
Rated power80 W (12 dB/oct. high-pass from 5000 Hz) / 40 W (12 dB/oct. high-pass from 3000 Hz)
Maximum power100 W (12 dB/oct. high-pass from 5000 Hz) / 60 W (12 dB/oct. high-pass from 3000 Hz)
Nominal impedance8 Ω
Frequency response (−10 dB)800–20000 Hz
Mean sound pressure level90 dB (1 W/1 m)
Opening angle (-6 dB)82°/4000 Hz
Excursion limit±0.5 mm
Resonance frequency fs1500 Hz
Magnetic induction0.96 T
Magnetic flux134 µWb
Height of front pole-plate2.5 mm
Voice coil diameter14 mm
Height of winding2.5 mm
Cut-out64 mm
Net weight0.165 kg
D.C. resistance Rdc7.0 Ω
Mechanical Q factor Qms1.26
Electrical Q factor Qes4.21
Total Q factor Qts0.97
Effective piston area Sd20 cm²
Inductance of the voice coil L0.16 mH
Terminals4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Dimensions and drawings
TW 70 · 8 Ω · part 9002 — Dimension drawing

Dimension drawing · Open original image

Installation and cabinet guidance

Allow a 64 mm panel opening. The frame is 64 mm square, with 4.5 x 6.5 mm fixing slots at the corners on a 74 mm circle; mark them from the unit itself rather than assuming the spacing. Behind the panel allow about 29 mm for the 64 mm sealed basket, plus room for the terminals and the wiring.

Mount it on a rigid baffle with a continuous seal between the frame and the panel, tighten the fixings evenly and only enough to seal so the frame is not distorted, and keep the cone 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 from 5000 Hz (80 W), or from 3000 Hz at a reduced 40 W, so 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 rear of the driver is sealed, so it needs no separate tweeter chamber inside the cabinet and can share the main enclosure volume. That saves building a partition when it goes into an existing cabinet.

Before ordering as a replacement, check the cut-out, fixing pattern, depth and impedance against the original driver, and make sure the host speaker's crossover gives it the high-pass protection its power rating assumes.

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