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Choosing a Speaker

MyLocoSound soundcards require an 8 ohm loudspeaker which is not included.  Your choice of speaker is highly important because it determines the quality of the sound produced.
MyLocoSound

If you want a “tinny”, “rasping” tone then you only need to purchase and fit a low cost speaker from your local consumer electronics store. Typically these come in 27mm or 57mm diameters. Use the largest which you can fit in your loco.

For a better quality sound and more volume, the speaker needs to be baffled. That means that it needs to be built into the front face of an airtight box so that sound is heard only from the front of the speaker and none from the back. The box can be made of plastic, styrene, wood, acryilic, etc. A popular choice is to use the plastic top of a spray paint can.

An easy solution, which ensures high quality sound with lots of deep throbbing bass, is to purchase an external speaker unit for iPod and MP3 music players and remove the two speaker modules for use in two locos. These are readily available at consumer electronics stores.

4 ohm speakers can also be used but draw more power and may cause the soundcard to shut down intermittently due to over heating. This problem can be avoided by fitting a 2 to 4 ohm resistor in series.