A Brief Summary Of The Harmonic Distortion Spec Of Wireless Outdoor Speaker Systems

Are you considering to pick a couple of cordless speakers? You might be puzzled by all of the technical jargon used by vendors to describe the performance of their models. I will clarify one regularly used term that, nonetheless, ist often misunderstood: “total harmonic distortion” or “THD”.

wireless speakers

Looking for the ideal model from the vast number of products, you may have a difficult time comprehending a few of the technical jargon and terms that you are going to find in the specifications of today’s wireless outdoor speakers available from Amphony Incorporated. Total harmonic distortion is generally not that well understood. Nevertheless, this term is still vital in terms of determining the quality of a specific type. Different terms, just like “output power” or “frequency response” are generally easier understood.

wireless speakers

Briefly, “harmonic distortion” describes how much the audio signal is being degraded because of the loudspeaker or in other words how much the signal differs from the original signal. There are two common methods in order to state harmonic distortion, either in percent (%) or in decibel (dB). A -20 dB or 10% distortion means that one tenth of the radiated audio is a consequence of distortion whilst -40 dB or 1% would mean that one percent of the energy are harmonic products of the original audio.

wireless speakers

Harmonic distortion in a cordless speaker is really the result of several elements, including the power amplifier which is built into the speaker in order to drive the loudspeaker element. Amplifier distortion normally depends on the amp output power and is every now and then specified for several output power levels.

Distortion ratings for various output power levels are normally specified for several power levels or as a diagram showing distortion versus output power. Both of these methods allow to better evaluate the quality of the amplifier.Besides, please note that distortion usually is measured for a certain test tone frequency. Normally a 1 kHz sine wave tone is used during the measurement. However, amplifier distortion will usually increase with increasing frequency, in particular in digital class-D models. Another element creating distortion is the speaker element which typically works with a diaphragm that carries a coil which is suspended in a magnetic field. The magnetic field is excited by the audio signal. The variation in magnetic flux, however, is not entirely in sync with the audio signal due to core losses in addition to other factors. Also, the type of suspension of the diaphragm will bring about nonlinear movement. As such the result is distortion caused by the loudspeaker element. A lot of producers are going to display harmonic distortion depending on the power level because typically the higher the loudspeaker is driven the bigger the level of distortion.

wireless speakers

The overall loudspeaker distortion is consequently brought about by the amplifier along with the loudspeaker element and in addition by a number of additional contributing factors. The speaker enclose is going to vibrate to some extent and therefore contribute to the distortion. To figure out the total distortion of a speaker, a signal generator is used which supplies an ultra-linear signal to the loudspeaker in addition to a measurement microphone which is attached to an audio analyzer to determine the amount of harmonics emitted by the loudspeaker. Then again, pure sine signals barely give an accurate indication of the distortion of the wireless loudspeaker with real-world signals. A better distortion analysis is the so-called intermodulation distortion analysis where a test tone which includes a number of sine waves is used. Then the number of harmonics at other frequencies is calculated.

Also, please note that many wireless speakers will experience audio distortion during the audio transmission itself. This is for the most part the case for transmitters which use analog or FM type transmission. Digital audio transmission however provides the lowest amount of signal distortion. The audio is digitized in the transmitter and not affected throughout the transmission itself. Digital wireless audio transmitters are available at 2.4 GHz plus 5.8 GHz.


Understanding the phrase “Speaker Power”

Modern wireless speakers available from Amphony Inc. come in all shapes and sizes. Finding the ideal model for your application can often be difficult . There is a flood of different names and terms describing loudspeaker performance. Furthermore, each maker shows a large amount of specifications, such as “sound pressure level”, “dynamic range” et cetera. In this commentary, I am going to have a closer look at one of the most essential of these terms: “speaker output power”. This specification is also referred to as “speaker wattage”. Loudspeaker specifications are from time to time hard to interpret because they are not completely uniform. As such it can be hard to figure out the real performance of the speaker simply by glancing at the specifications. A decent technique however is to perform a listening test before purchasing your speaker. Throughout this test you ideally wish to set up the speakers in a similar setting as your application. Now I am going to offer some facts concerning “loudspeaker power”. This spec is often misunderstood. It is important to look rather closely at how the maker shows this parameter.

wireless speakers

The output power of the loudspeakers is shown as “wattage”. This shows how loud your loudspeaker can sound. Based on your application, you can choose a small speaker tolerating merely a few watts or a larger one enduring a few hundred watts. Many smaller home speakers only can be driven with a few watts power which regularly is adequate for a small space. If you intend to shake your walls then you clearly wish to opt for a speaker that has up to several hundred watts. The majority of speakers will show increasing music distortion as output wattage increases. For that reason, you wish to choose a speaker which offers higher output power than you are going to really require. This will assure that you will never drive the loudspeaker into regions of large distortion.

wireless speakers

There are 2 widespread ways to display speaker wattage. These are “peak power” and “rms power”. “Peak power” shows how much wattage the speaker may endure for a short burst. On the other hand, “rms power” describes how much power the loudspeaker can tolerate for a longer amount of time without being damaged. The peak power rating in history frequently led to producers showing high wattage ratings for tiny speakers. However, in practice these speakers would not be able to tolerate bigger levels of output wattage for longer amounts of time.

Music and voice is not constant in terms of loudness. As such the peak power spec is nonetheless important, although not as vital as the rms power rating. Ideally the loudspeaker is going to show both the rms and peak power rating. Having a high peak power rating is going to make certain adequate headroom for power peaks that are common in audio signals. The main reason is that music signals will have short peaks of high power that the speaker has to tolerate. Rms power is measured with a uniform sine signal which hardly compares with a music signal in terms of the power envelope.

wireless speakers

Generally the impedance of the speakers which you connect to your audio amplifier will determine how much output power your amplifier may deliver. Speaker impedance is measured in Ohms. Typically speakers have an impedance between 4 and 8 Ohms. Due to the limited supply voltage of your amp, the maximum output power is going to be half if you connect an 8-Ohm loudspeaker than the peak output power that the amplifier can provide to a 4-Ohm speaker. Commonly a 4-Ohm speaker is utilized as a reference.

Exactly How Complex Are Wireless Loudspeakers To Manufacture?

Are you attempting to install a new home theater system or some cordless speakers? The easiest method is to hire a qualified installer in order to aid you. Then again, you may consider doing the install yourself. I am going to outline the basic setup process and give some helpful hints to help stay away from some common problems.

After unpacking your new home theater system, you will normally find a central component along with 5 or 7 speakers. The main component is going to deliver the audio for each and every one of your loudspeakers which you will install. This central component is the main hub of your home theater system. You are going to generally be able to control it through remote control. It will process the sound and split it into the sound element for each separate speaker.

Choose a place for the surround receiver. You might wish to locate it where you have the largest amount of space. Nonetheless, please also keep in mind that you are going to need to run speaker cable to every loudspeaker, so don’t pick a location which is too remote. If you have your television set up center then a good spot for your receiver might be anywhere near your TV. This will also simplify connecting your receiver to the audio output of your television set. Then again, choose an alternate location if your TV already is rather crowded with different gear.

The receiver requires an audio signal in order to deliver surround sound. Normally it will accept an optical surround sound signal. You can connect this input to your television set by utilizing a fiberoptical cord. This cord may not be included with your system but it is available at any electronics shop. Then again, setting up your speakers may be somewhat more tricky. If you have cordless rear loudspeakers you will not require as much speaker cord and the setup is going to be a bit quicker. First of all, measure how much speaker cord you are going to require. You will require to keep in mind furnishings and carpets and add some extra length to your calculations. This way you will have enough cable for all of the twists and turns. Speaker cord is available in different gauges. The higher power you are driving into your loudspeaker the larger the required gauge. This is going to avoid your cable from overheating and also helps reduce cable losses. Your subwoofer will usually have a built-in amplifier and attach to your receiver by RCA cable.

The speaker cord attaches to each speaker by the loudspeaker terminals. These terminals are color coded. This helps observe the right polarity when connecting the speaker cord. Choose a speaker cord which shows one strand in a different color than the other. Then attach the cable to all speakers the same way. Next, when attaching the speaker cord to your receiver, make certain that you attach the cable to each speaker terminal at the receiver in the same way. This will keep the sound going to each speaker in the correct phase and optimize your music experience. Cordless rear loudspeakers (Uncover helpful info on outdoor powered speakers from this website) will normally incur an audio delay during transmission. This delay is also called latency. Ideally, all speakers have the same latency and therefore are in perfect sync. If you have a kit which employs cordless rears and wired front speakers, i.e. you have a mixture of wireless and wired speakers, you ought to try to delay the audio going to the wired speakers by the latency of the wireless speakers.

Verify with the maker if your surround receiver can be set to delay the signal of particular channels. If you are using wireless rears, you want to set the front-speaker and side-speaker channels to delay the audio. If your receiver does not support adding an audio latency, you may want to pick a wireless speaker kit that has minimum audio latency in order to keep your speakers in sync. A number of available kits have audio latencies of fewer than 1 ms. Also, look at http://www.hupso.com/www/4homespeakers.com for more tips.

A Glimpse At Bluetooth Audio Receivers

Cutting-edge smartphones allow you to store and also watch films and audio. The headphones which are provided with smartphones usually give fairly inadequate sound quality. A better option will be to play your tunes by means of a pair of speakers. You are able to attach your phone to some stereo speakers via a headphone cable. However, there are a number of wireless options available for sending songs to a pair of stereo speakers. Connecting your stereo speakers to your cellphone by employing a cable is normally not appealing. It is possible to trip over the wire and your cellular phone is tethered to the speakers. In the following paragraphs I’m going to examine several wireless alternate options designed for transmitting your tracks to some stereo speakers. You can find a number of alternate options available on the market for connecting speakers to your cell phone. Bluetooth receivers for speakers happen to be one of the most desired choices designed for sending songs from a cellphone. Bluetooth is supported by almost all of modern cell phones. Bluetooth audio receivers can pick up the songs which is streamed from the mobile phone and turn the wireless signal back to sound. Bluetooth works with quite a few protocols with regard to sending audio. A2DP as well as AptX happen to be some of the most commonly used standards. AptX, however, is just understood by the most recent generation of cellular phones whilst A2DP is compatible with the vast majority of cellular phones. You are able to hook up Bluetooth music receivers to any active stereo speakers. However, the majority of stereo speakers on the market happen to be passive. To attach to a passive speaker you’ll have to make use of an external power amp. Instead of employing a Bluetooth audio receiver, you can furthermore get an integrated receiver/amplifier. These units have got an integrated audio amp. They can attach directly to just about any passive speakers. The cordless range of those receivers is usually only approximately 30 ft. So do not think of utilizing them for the purpose of streaming audio all through your house. The true range is dependent upon the environment and also on your cellphone. Additionally you can send audio from various other gadgets which support Bluetooth by making use of the same setup. One more option is Airplay. Airplay is an Apple specific standard which makes it possible for streaming of uncompressed audio. Then again, remember the songs located on your cellular phone is generally compressed by using the MP3 or AAC standard and consequently using Airplay won’t enhance the audio quality. If on the other hand you have got uncompressed audio available then using Airplay makes a lot of sense. AptX is actually a compromise between the widespread A2DP standard and Airplay. It does offer near CD-quality audio streaming – once again presuming that you have uncompressed music available. This particular standard is not yet understood by a lot of cell phones but the newest Bluetooth receivers offer AptX as one option. One more option for streaming songs from your cell phone are Bluetooth cordless loudspeakers. Bluetooth loudspeakers are commonly fairly little. Consequently, they often lack with regards to sound quality. Try out any kind of product before you buy any kind of Bluetooth loudspeakers in order to steer clear of an upsetting surprise. To get the greatest audio quality, making use of a standalone Bluetooth audio receiver is thus a good idea. You can pick any speaker that you like. If you desire mobility and choose a Bluetooth loudspeaker, check that it works with your particular cellphone first.

How Does Cordless Speaker Energy Efficiency Influence Sound Quality?

When you are ready to get brand-new wireless speakers, you could be concerned about how efficiently your wireless speakers operate. I’ll make clear just what the phrase “power efficiency” means plus why you should take a closer look at this figure throughout your selection of new wireless speakers. Several problems are a result of wireless speakers that have low power efficiency: A large amount of squandered energy obviously means higher running expenditure which means that a more expensive set of wireless speakers might actually in the long term be more affordable when compared to a cheaper product which has lower efficiency. Lower efficiency cordless loudspeakers will dissipate a lot of power as heat. Heat won’t radiate well through tiny surfaces. For that reason low-efficiency outdoor loudspeakers must use heat sinks. Heat sinks and fans need room and are expensive. The wireless loudspeakers hence will turn out to be fairly large and costly. Additionally heat fans are going to produce operating noise. Low-efficiency wireless speakers additionally require a great deal of circulation around the wireless loudspeakers. Therefore they can’t be placed in close spaces or inside air-tight enclosures.

Since low-efficiency cordless loudspeakers will produce just a small fraction of the energy consumed by the amplifier as useful audio energy, the amplifier needs a larger power supply than high-efficiency models resulting in higher cost. An increased amount of heat causes additional stress on components. The lifespan of the wireless loudspeakers might be reduced and reliability might be compromised. High-efficiency cordless loudspeakers on the other hand tend not to experience these problems and may be built small.

While purchasing a pair of cordless speakers, you’ll find the efficiency in the data sheet. This figure is usually expressed as a percentage. Analog Class-D amplifiers offer a power efficiency of around 25% while switching-mode amps offer close to 98%. The larger the efficiency value, the less the amount of power squandered as heat. A 100-Watt amp which has a 50% efficiency would have an energy consumption of 200 W. What’s less well-known about efficiency is the fact that this value is not fixed. The truth is it differs based on how much energy the amplifier delivers. For that reason occasionally you will discover efficiency values for various energy levels in the data sheet. Because every amplifier will need a certain amount of energy, irrespective of the level of energy the amp delivers to the loudspeakers, the amp power efficiency is larger the more power the amp provides and is generally specified for the highest power the amplifier can handle.

In order to figure out the power efficiency, the audio power that is consumed by a power resistor which is attached to the amplifier is divided by the total energy the amplifier consumes while being fed a constant sine wave tone. To get a complete power efficiency profile, the audio power of the amp is swept between several values. At each value the efficiency is measured and plotted onto a chart.

Even though switching (Class-D) amplifiers have amongst the highest power efficiency, they have a tendency to have larger music distortion than analog music amps and reduced signal-to-noise ratio. Hence you will have to weigh the size of the cordless loudspeakers against the sound fidelity. Then again, digital amplifiers have come a long way and are offering improved audio fidelity than ever before. Wireless loudspeakers that employ Class-T amps come close to the music fidelity of models which have analog amps. Due to this fact selecting a set of cordless loudspeakers which utilize switching amplifier with great music fidelity is now feasible.

A Brief Guide For Understanding Stereo Amplifiers

Requirements regarding audio power and audio fidelity of modern loudspeakers and home theater products are always growing. At the center of those products is the power amp. Recent power amps have to perform well enough to meet those ever increasing demands. With the ever increasing quantity of models and design topologies, including “tube amps”, “class-A”, “class-D” as well as “t amplifier” designs, it is getting more and more complex to choose the amplifier that is perfect for a specific application. This article will describe some of the most popular terms and spell out some of the technical jargon which amplifier producers regularly use. Simply put, the purpose of an audio amp is to convert a low-power music signal into a high-power audio signal. The high-power signal is large enough to drive a loudspeaker adequately loud. As a way to do that, an amplifier uses one or several elements which are controlled by the low-power signal in order to generate a large-power signal. Those elements range from tubes, bipolar transistors to FET transistors. Tube amplifiers used to be popular a couple of decades ago. A tube is able to control the current flow in accordance to a control voltage which is connected to the tube. Tubes, though, are nonlinear in their behavior and will introduce a rather large level of higher harmonics or distortion. Many people prefer tube amps because these higher harmonics are often perceived as the tube amplifier sounding “warm” or “pleasant”.

Besides, tube amps have quite small power efficiency and as a result dissipate a lot of power as heat. Yet one more drawback is the high price tag of tubes. This has put tube amps out of the ballpark for many consumer products. Because of this, the majority of audio products today uses solid state amplifiers. I will explain solid state amps in the next sections. Solid-state amps employ a semiconductor element, like a bipolar transistor or FET rather than the tube and the earliest type is often known as “class-A” amps. In a class-A amplifier, the signal is being amplified by a transistor which is controlled by the low-level audio signal. Class-A amps have the lowest distortion and typically also the smallest amount of noise of any amplifier architecture. If you need ultra-low distortion then you should take a closer look at class-A types. The main drawback is that similar to tube amps class A amps have quite small efficiency. Consequently these amplifiers require big heat sinks in order to dissipate the wasted energy and are frequently fairly heavy.

Class-AB amps improve on the efficiency of class-A amplifiers. They employ a number of transistors in order to split up the large-level signals into 2 distinct regions, each of which can be amplified more efficiently. As such, class-AB amps are usually smaller than class-A amps. Class-AB amps have a disadvantage however. Each time the amplified signal transitions from one region to the other, there will be certain distortion produced. In other words the transition between these 2 areas is non-linear in nature. Therefore class-AB amplifiers lack audio fidelity compared with class-A amps. Class-D amps improve on the efficiency of class-AB amps even further by employing a switching transistor which is always being switched on or off. Thereby this switching stage barely dissipates any energy and thus the power efficiency of class-D amps frequently exceeds 90%. The on-off switching times of the transistor are being controlled by a pulse-with modulator (PWM). Standard switching frequencies are in the range of 300 kHz and 1 MHz. This high-frequency switching signal has to be removed from the amplified signal by a lowpass filter. Commonly a straightforward first-order lowpass is being used. The switching transistor and also the pulse-width modulator frequently have rather big non-linearities. As a result, the amplified signal is going to contain some distortion. Class-D amplifiers by nature exhibit larger audio distortion than other kinds of mini audio amplifiers. To resolve the dilemma of large audio distortion, new switching amp designs incorporate feedback. The amplified signal is compared with the original low-level signal and errors are corrected. “Class-T” amps (also known as “t-amplifier”) use this type of feedback method and therefore can be manufactured very small whilst achieving low music distortion.

Exactly How Have Contemporary Wireless Speakers Improved Lately?

I will take a look at just how modern day sound transmission technologies which are utilized in nowaday’s wireless speakers work in real-world conditions having a large amount of interference from other cordless products.

The most common frequency bands which can be used by cordless products are the 900 MHz, 2.4 GHz and 5.8 GHz frequency band. Primarily the 900 MHz and also 2.4 GHz frequency bands have started to become crowded by the increasing quantity of products just like wireless speakers, wireless phones and so on.

The cheapest transmitters generally broadcast at 900 MHz. They operate similar to FM stereos. Because the FM transmission uses a small bandwidth and thereby just uses up a tiny part of the free frequency space, interference is generally avoided simply by changing to a new channel. The 2.4 Gigahertz and 5.8 Gigahertz frequency bands are utilized by digital transmitters and also are getting to be pretty congested recently as digital signals occupy far more bandwidth than analogue transmitters.

Frequency hopping products, on the other hand, are going to continue to lead to further problems as they will disrupt even transmitters using transmit channels. Audio can be considered a real-time protocol. Consequently it has stringent requirements concerning dependability. Also, small latency is vital in numerous applications. For this reason more sophisticated strategies are needed to ensure stability.

One technique is referred to as FEC or forward error correction. This technique allows the receiver to fix a corrupted signal. For this purpose, additional data is transmitted from the transmitter. By using several advanced algorithms, the receiver can then fix the information which may partially be corrupted by interfering transmitters. Consequently, these systems can easily transmit 100% error-free even when there’s interference. Transmitters using FEC can transmit to a multitude of cordless devices and does not require any feedback from the receiver. A different technique utilizes bidirectional transmission, i.e. each receiver transmits data back to the transmitter. This method is only practical if the number of receivers is small. It also requires a back channel to the transmitter. The data packets include a checksum from which every receiver can decide if a packet was received correctly and acknowledge correct receipt to the transmitter. Because dropped packets must be resent, the transmitter and receivers must hold data packets in a buffer. Employing buffers leads to a delay or latency in the transmission. The amount of the delay is directly related to the buffer size. A bigger buffer size increases the stability of the transmission. A large latency can generate problems for certain applications however. In particular when video is present, the sound should be synchronized with the movie. In addition, in multichannel surround sound applications where several speakers are wireless, the outdoor wireless speakers should be in sync with the corded loudspeakers. Products which incorporate this kind of mechanism, however, are limited to transmitting to a small number of receivers and the receivers use up more energy.

Often a frequency channel can become occupied by another transmitter. Ideally the transmitter is going to understand this fact and change to another channel. To achieve this, a number of wireless speakers consistently watch which channels are available to enable them to instantly switch to a clear channel. Because the transmitter has a list of clean channels, there isn’t any delay in looking for a clean channel. It’s simply chosen from the list. This approach is often called adaptive frequency hopping spread spectrum.