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Amp Speaker
Explaining The Distortion Specification Of Wireless Speakers
Have you ever asked what some of the technical jargon means that vendors take to show the quality of cordless loudspeakers? In this expose, I am going to clarify a regularly used specification: THD or "total harmonic distortion".Looking for the ideal type from the vast amount of models, you may have a hard time understanding a few of the technical jargon and specs which you will see in the specifications of modern cordless loudspeakers. Total harmonic distortion is generally not very well understood. However, this term is nonetheless significant by way of determining the performance of a specific model. Other specs, just like "output power" or "frequency response" are usually easier understood.
In a nutshell, THD shows the difference between the audio which is produced by the speaker versus the audio signal with which the speaker is driven. The most common ways to state distortion are percent and decibel. These 2 conventions can be translated into one another. A -20 dB or 10% distortion means that one tenth of the radiated sound is a result of distortion while -40 dB or 1% would mean that one percent of the energy are harmonic products of the original audio.On the other hand, be cautious as there are in reality a few elements which cause harmonic distortion. Wireless loudspeakers along with any kind of active loudspeaker or active subwoofer all have built-in power amplifiers to drive the loudspeaker element.|Harmonic distortion inside a cordless speaker is in fact the consequence of numerous components, such as the power amp that is built into the speaker in order to drive the speaker element.|A cordless speaker in fact has several components that add to harmonic distortion. One of these is the built-in power amplifier. This amplifier is driving the speaker element.} Generally the higher the amp is driven the higher the level of amp distortion. For this reason, several manufacturers will list amp distortion depending on amplifier output power.
Having amp distortion specs for several output power levels offers a better indication of the amplifier distortion performance.In addition, please understand that distortion typically is measured for a specific test tone frequency. Typically a 1 kHz sine wave tone is utilized during the measurement. This allows comparing equipment from various suppliers. However, distortion usually varies with different frequencies. A lot of digital amps are going to exhibit growing distortion amid higher frequency which cannot easily be discovered by looking at the spec sheet.
The second contributing factor is the loudspeaker element itself. Most loudspeakers employ a diaphragm kind driver that is driven by a voicecoil that is suspended in a magnetic field. The magnetic field is excited by the audio signal. The change in magnetic flux, however, is not entirely in sync with the audio signal resulting from core losses and other factors. In addition, the kind of suspension of the diaphragm will create nonlinear movement. As such the result is distortion brought about by the speaker element. The majority of manufacturers are going to exhibit harmonic distortion depending on the audio level as usually the higher the loudspeaker is driven the higher the level of distortion.
The total distortion of the speaker therefore is the total of the amp distortion and the speaker element distortion. On top of that, there are other contributing factors. The loudspeaker enclose is going to vibrate to some extent and therefore contribute to the distortion.Total distortion is best determined through measurement. A signal generator is used which supplies a highly linear sine tone to the speaker. The audio is recorded by a measurement microphone. The microphone signal is then analyzed by an audio analyzer. The audio analyzer will compute the level of higher harmonics or distortion. However, pure sine signals hardly give an accurate indication of the distortion of the wireless speaker with real-world signals. A better distortion analysis is the so-called intermodulation distortion analysis in which a test tone which consists of a number of sine waves is used. Then the level of harmonics at different frequencies is measured.
In addition, please understand that the majority of cordless speakers are going to experience signal distortion during the audio transmission itself. This is for the most part the case for transmitters which use analog or FM type transmission. More sophisticated products employ digital audio transmission. Typically these transmitters operate at 2.4 GHz or 5.8 GHz.
About the Author
You can find additional details about wireless outdoor speakers as well as wireless surround sound speakers from Amphony's web page.
How do I set up a Bi-Amp, Bi-Speaker system?
I have a 1500 watt and a 900 watt amp, both bridge capable. My speakers suggest that I run them on a 4ohm channel between 800-1200 watts each. How would I go about setting this up?
More specifically, should I be using bridge mode?
Kremer - It would really help if you would let us know the make and model of the amps and speakers. I set pro sound systems but I need more details. If you click on "Daniel K" you can contact me.
My DIY tube amp and speaker test