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Visaton SL 70 NDV 4 Ohm, 2.5 Inch, Full Range Speaker

SL 70 NDV · 4 Ω · part 2274 — Product photo

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SL 70 NDV · 4 Ω · part 2274 — Product photoProduct photo SL 70 NDV · 4 Ω · part 2274 — Rear view and connectionsRear view and connections SL 70 NDV · 4 Ω · part 2274 — Dimension drawingDimension drawing SL 70 NDV · 4 Ω · part 2274 — Response and impedanceResponse and impedance SL 70 NDV · 4 Ω · part 2274 — Directivity patternDirectivity pattern

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

SL 70 NDV · 4 Ω · part 2274 — Product photo

Product photo

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Part number: 2274

A light, robust full-range driver for narrow speaker columns.

Nominal size
6.5 cm / 2.5 inch
Impedance
4 Ω
Rated power
8 W
Cut-out
63/60 mm (Installation front/rear)
Sensitivity
86 dB (1 W/1 m)
Resonance
220 Hz
ex VAT
£21.54 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 SL 70 NDV combines a compact neodymium magnet with a robust plastic construction for music and speech. It suits narrow public-address columns, electronic instruments and built-in equipment. This 4 Ω driver handles 8 W rated power and weighs 61 g. Front-side IP65 protection requires a sealed installation.

Typical applications

  • Narrow public-address columns
  • Electronic instruments
  • Built-in equipment
  • Model construction
Full specifications
SL 70 NDV · 4 Ω
Rated power8 W
Nominal impedance4 Ω
Frequency response (−10 dB)150–20000 Hz
Mean sound pressure level86 dB (1 W/1 m)
Excursion limit±3.8 mm
Resonance frequency fs220 Hz
Magnetic induction1.26 T
Magnetic flux148 µWb
Voice coil diameter14.28 mm
Height of winding2.65 mm
Cut-out63/60 mm (Installation front/rear)
Net weight61 g
D.C. resistance Rdc3.7 Ω
Mechanical Q factor Qms4.9
Electrical Q factor Qes2.23
Total Q factor Qts1.53
Equivalent volume Vas0.43 l
Effective piston area Sd21.6 cm²
Dynamically moved mass Mms0.8 g
Force factor Bxl1.39 Tm
Terminals2.8 x 0.5 mm (+)/2.8 x 0.5 mm (-)
Protective systemIP65 — front side in a sealed enclosure
Temperature range-40 to 85 °C
Dimensions and drawings
SL 70 NDV · 4 Ω · part 2274 — Dimension drawing

Dimension drawing · Open original image

Installation and cabinet guidance

Choose the mounting direction before cutting: the opening is 63 mm for front installation or 60 mm for rear installation. Allow for the 66 mm square frame, 52 mm fixing pitch and 35.6 mm overall depth, plus the connectors.

Seal the mounting joint into a sealed enclosure and protect the rear and terminals from moisture. IP65 applies to the front only; adhesive and a front grille may be needed to complete the seal.

Use an amplifier suitable for the 4 Ω load and follow the polarity marks. Check blade width and thickness before choosing connectors, insulate the connections and secure the wiring clear of the moving parts.

For a 100 V line system, connect through a correctly rated line transformer; do not connect this low-impedance driver directly to the line.

Use this impedance version’s enclosure parameters when developing a cabinet, and test the response at the intended listening level. Allow for the volume occupied by the driver and keep damping material clear of the cone and terminals.

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