Have you ever wondered what some of the technical language means that vendors use in order to specify the quality of wireless outdoor speakers manufactured by Amphony? In this essay, I will clarify a commonly used specification: THD or “total harmonic distortion”.
It is often tricky to choose a suitable pair of wireless speakers given the great number of models. Aside from looks, you will often be faced with having to consider a few of the technical specs. Total harmonic distortion is typically not very well understood. Nevertheless, this term is nonetheless significant in terms of determining the quality of a specific type. Different specs, such as “output power” or “frequency response” are usually easier understood.
In short, “harmonic distortion” shows how much the audio signal is being deteriorated because of the speaker or in other words how much the signal differs from the original signal. There are two widespread ways in order to state harmonic distortion, either in percent (%) or in decibel (dB). If a speaker states a distortion of 10% for instance then one tenth of the energy radiated by the speaker is distortion. A distortion of 10% can also be stated as -20 dB. 1% distortion is equal to -40dB.
Harmonic distortion in a cordless speaker is in fact the consequence of numerous components, such as the power amp which is built into the speaker in order to drive the loudspeaker element. Amp distortion usually is dependent on the amp output power and is sometimes shown for a few power levels.
Having amp distortion specifications for a few output power levels provides a better picture of the amp distortion performance.Typically distortion is measured with a 1 kHz test tone. This allows comparing equipment from various makers. However, distortion normally varies with different frequencies. Many digital amplifiers are going to exhibit rising distortion amid higher frequency which can not easily be uncovered through glancing at the spec sheet.
Distortion is also induced by the speaker driver itself. Most loudspeakers use a driver that carries a coil. This coil is placed in a magnetic field. The magnetic field is excited by the audio signal. The change in magnetic flux, however, is not perfectly in sync with the audio signal as a result of core losses and other factors. In addition, the kind of suspension of the diaphragm is going to bring about nonlinear movement. This results in the audio being distorted by the loudspeaker element itself. What’s more, the larger to power level with which the speaker is driven, the bigger the distortion. Regularly speaker producers will display distortion for small to moderate output power levels only.
The overall loudspeaker distortion is as a result triggered by the amplifier along with the speaker element and in addition by a series of added contributing factors. The loudspeaker enclose will vibrate to some extent and as a result contribute to the distortion.
The total distortion of the speaker is ordinarily determined by a measurement which includes a low-distortion audio generator plus a microphone that is attached to an audio analyzer. The audio analyzer is going to calculate the amount of higher harmonics and compare these with the main signal in order to compute the distortion. Another distortion measurement method which provides a better analysis of the loudspeaker quality with real-world signals is called interharmonic distortion analysis. This technique outputs two signals at different frequencies and measures the amount of harmonics at different frequencies. Also, please understand that most cordless speakers are going to experience signal distortion during the audio transmission itself. This is mostly the case for transmitters which use analog or FM type transmission. More sophisticated products use digital audio transmission. Normally these transmitters work at 2.4 GHz or 5.8 GHz.