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8 Ohm Electrodynamic Exciter

19.25
Make a speaker out of almost anything with these Electrodynamic Exciters. Simply glue or screw the exciter to the surface to turn it into a speaker.

Availability: In Stock.

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Product versions:

This product is also available in the following versions:

Stock code
Description
Price
3331
25W 8 Ohm Electrodynamic Exciter
£29.00
3332
10W 8 Ohm Electrodynamic Exciter
£19.25

Use the drop down list above to select your option. Price shown is GBP (ex VAT). Local currency price and price breaks (if applicable) will be shown once you have chosen an option.

Product description:

Make any flat rigid plate surface into a speaker with this electrodynamic exciter.

These are often used in things such as arcade/pub quiz machines where they are screwed directly onto the frame of the machine.

The exciter (or bodyshaker as they are sometimes known) is basically a loudspeaker without a membrane. It works by applying an audio signal to the contact pins, the oscillating mass then starts shaking with the frequency of the applied signal. This oscillation is transmitted to the mounting plate and from there on to the surface the exciter is stuck to. The surface then emits the audio signal just like a speaker!

There are some differences in how the sound is emitted compared to a speaker. The excited surface is very large and heavy (when compared to a lightweight cone membrane in a speaker), and thus unable to oscillate coherently. That means that not every point of the surface moves into the same direction with the same amplitude at the same time.

The exciter generates a bending wave which propagates towards the edge of the excited plate, where it is reflected back towards the exciter. To illustrate this behaviour, imagine a stone thrown into a basin of water. From the point where the stone hits the surface of the water, a circular bending wave propagates towards the seam of the basin, where it is reflected. The original wave and the reflected wave interfere with each other, causing a chaotic wave-pattern on the water surface. The same applies to the excited surface: The original wave from the exciter interferes with the reflected waves from the edges of the plate, resulting in an incoherent emission of sound. This incoherent sound emission is the main reason for the very wide, uniformly distributed sound field of an excited surface.

The quality of the reproduced audio signal is strongly dependent on the characteristics of the excited surface, such as material, shape and dimensions.

  • The larger the excited plate, the better the reproduction of low frequencies, the sound output is more voluminous whilst inversely the smaller the excited plate, the weaker the reproduction of low frequencies, the sound output is less voluminous.
  • The lighter a surface the better, as the efficiency factor (sound pressure level compared to input power) decreases with increasing weight of the excited plate.
  • The structure of the excited surface has a great impact on the sound output. Large surfaces with few reinforcing structures work best.

Simply attach the speaker to the surface of the plate by gluing or screwing.

We've had great results with sandwich panels with honeycomb structures (e.g. hexagon-structure), thin particle boards (e.g. HDF / MDF) and acrylic sheets.

Features:

  • Turn any flat rigid surface into a speaker.

Contents:

Either:

  • 1 x 25W 8 Ohm Electrodynamic Exciter.

Or:

  • 1 x 10W 8 Ohm Electrodynamic Exciter.

Dimensions:

25W 8 Ohm Electrodynamic Exciter:

  • Length: 79mm.
  • Width: 58mm.
  • Height: 21mm.

10W 8 Ohm Electrodynamic Exciter:

  • Length: 59mm.
  • Width: 38mm.
  • Height: 17mm.

Video:

 

Requires:

Caution:

  • The plate should consist of a non-magnetic material. The exciter contains a permanent magnet which would cause a harmful pre-tension to the suspension of the exciter if attached to a magnetic plate.
  • When wiring up an exciter, the cables must be routed in such a manner, that they cannot cause any noise by vibrating or rattling against the surface. If necessary, the wires can be foam-padded to avoid such noise.

Physical characteristics:

25W 8 Ohm Electrodynamic Exciter:

  • Length: 79mm.
  • Width: 58mm.
  • Height: 21mm.

10W 8 Ohm Electrodynamic Exciter:

  • Length: 59mm.
  • Width: 38mm.
  • Height: 17mm.

Electrical characteristics:

25W 8 Ohm Electrodynamic Exciter:

  • Maximum Power: 25W.
  • Impedance: 8 Ohms.

10W 8 Ohm Electrodynamic Exciter:

  • Maximum Power: 10W.
  • Impedance: 8 Ohms.
introducing_electrodynamic_exciters_thumb
Video: Introducing Electrodynamic Exciters. Make Speakers from Anything!
These exciters let you make a speaker from just about anything!

Questions:

Posted by Harry powell, Thursday, 23 June 2016 on product 8 Ohm Electrodynamic Exciter

Question:

Hi my name is harry and i am a pupil of Ballard school and for GCSE i am designing a speaker to attach on the frame of a road bike. I am wondering if product 3337 and 3332 can be used with Titanium, steel and carbon fiber. If so please email me back as soon as possible thanks. From Harry Powell.

Answers:

  • Posted by Michael Lockhart on Thursday, 23 June 2016

    Hi Harry, The exciter contains a permanent magnet which would cause a harmful pre-tension to the suspension of the exciter if attached to a magnetic plate, as such a metal surface is not recommended for exciters. Also a carbon fibre surface may not be stiff enough to provide the vibration needed to create the sound.

Posted by ali richardson, Thursday, 19 February 2015 on product 8 Ohm Electrodynamic Exciter

Question:

what is the freq range for these devices?

Answers:

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