Have you ever thought of making your own portable speaker in a CD case? Here is how you do it.
Step 1: Components required
- 8W speaker with 4 ohms impedance (Make sure the speaker's impedance must match your amp's specification or you would damage your amp!!)
- CD case ( Use the one with a zip would be good)
- 18W Amplifier module (I used the Kemo #M033, you can use other amplifiers as long as the Watts are not 2.5 times larger than your speaker's power level)
- Rocker switch
- 3.5mm stereo adapter
- Battery snap and a 9V battery
- Solder iron and some solder
- Glue gun
- Cutting knife
If you choose an amp that is supplying too much power to your speakers, then its clear that there is a chance that you will damage them. It may cause the voice coil to overheat, or the speaker could move back and forth too much (known as exceeding its Xmax).
However if you have a smaller amplifier you may have to run it all the way up full to provide enough power to your speakers. When running at full blast, there will be lots of stress on the components of the amps and it can introduce a significant amount of distortion into your signal, which is often called 'clipping'.
As well as sounding very bad, trying to reproduce a clipping signal can potentially do far more damage to your speakers that a little too much power.
Therefore the unwritten rule is that you should have an amplifier that is capable of 1.5 to 2 times the power rating of your speaker system, and only turn it up part way. The extra power available is called the headroom, and means that your amplifier should never been running at full tilt and therefore producing a distorted, or clipped, signal.