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Visaton BF 45 4 Ohm, 1.8 Inch, Full Range Miniature Speaker

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BF 45 · 4 Ω · part 2240 — Product photo

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BF 45 · 4 Ω · part 2240 — Product photoProduct photo BF 45 · 4 Ω · part 2240 — Dimension drawingDimension drawing BF 45 · 4 Ω · part 2240 — Response and impedanceResponse and impedance BF 45 · 4 Ω · part 2240 — Directivity patternDirectivity pattern

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

BF 45 · 4 Ω · part 2240 — Product photo

Product photo

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Part number: 2240

A slim aluminium-cone driver for compact music and speech.

Nominal size
4.5 cm / 1.8 inch
Impedance
4 Ω
Rated power
4 W
Cut-out
45 mm
Sensitivity
79 dB (1 W/1 m)
Resonance
160 Hz
ex VAT
£19.14 inc VAT
Maximum quantity available reached.

Stock and dispatch
Selected products are held in UK stock; other lines are sourced to order. Dispatch timing depends on the product and quantity.

Delivery information. Need it for a specific date? Ask us.

Quantity discounts

Description

The BF 45 uses a silver-coloured aluminium diaphragm and transparent plastic basket to fit music and speech reproduction into a small space. Two mounting lugs simplify fitting in narrow equipment. This 4 Ω version handles 4 W rated power and weighs 32 g, with a 45 mm panel opening.

Typical applications

  • Compact multimedia equipment
  • Built-in speech and music
Full specifications
BF 45 · 4 Ω
Rated power4 W
Maximum power8 W
Nominal impedance4 Ω
Frequency response (−10 dB)90–20000 Hz
Mean sound pressure level79 dB (1 W/1 m)
Resonance frequency fs160 Hz
Height of front pole-plate3 mm
Voice coil diameter17 mm
Height of winding4 mm
Cut-out45 mm
Net weight32 g
TerminalsSolder lugs
Temperature range-25 to 70 °C
Diaphragm colourSilver
Dimensions and drawings
BF 45 · 4 Ω · part 2240 — Dimension drawing

Dimension drawing · Open original image

Installation and cabinet guidance

Allow for a 45 mm opening and two fixing lugs. Check the depth and fixing pitch against the actual driver before machining a close-fitting housing. Tighten the fixings evenly without bending the plastic lugs.

Mount on a rigid panel with a continuous seal around the frame to prevent air leaks and rattles. Keep the cone and surround clear of the grille and internal parts.

Use an amplifier suitable for the 4 Ω load and follow the polarity marks. Solder without prolonged heating, insulate the joints and secure the wires so they cannot touch the cone or pull on the lugs.

Test the driver in the intended enclosure before fixing the cabinet design. Keep the rear acoustic space clear and check low-frequency cone travel at the intended operating level; a small driver’s usable bass depends on the enclosure and required output.

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