Are you searching to get a new a pair of wireless loudspeakers for your home? You may be dazzled by the amount of choices you have. In order to make an informed selection, it is best to familiarize yourself with common specs. One of these specifications is called “signal-to-noise ratio” and is not frequently understood. I will help explain the meaning of this term. As soon as you have narrowed down your search by looking at several key criteria, such as the level of output wattage, the dimensions of the speakers and the price, you are going to still have quite a few models to choose from. Now it is time to look at a few of the technical specifications in more detail. The signal-to-noise ratio is a rather key specification and describes how much noise or hiss the wireless loudspeaker makes.
A method in order to accomplish a straightforward assessment of the noise performance of a set of wireless speakers is to short circuit the transmitter audio input and then to crank up the cordless loudspeaker to its utmost. Next listen to the speaker. The noise which you hear is created by the cordless speaker itself. Be certain that the volume of each pair of cordless speakers is couple to the same level. Otherwise you will not be able to objectively compare the level of hiss between different models. The general rule is: the lower the amount of hiss which you hear the better the noise performance.
If you favor a set of wireless loudspeakers with a small level of hissing, you can look at the signal-to-noise ratio number of the data sheet. The majority of manufacturers will show this number. cordless loudspeakers with a high signal-to-noise ratio will output a small amount of noise. There are a number of reasons why wireless speakers introduced at http://www.amphony.com/products/wireless-speaker.htm are going to add some form of noise or other unwanted signal. Transistors and resistors that are part of each modern wireless speaker by nature produce noise. The overall noise is dependent on how much hiss every component generates. Nonetheless, the location of these elements is also significant. Components which are part of the loudspeaker built-in amplifier input stage are going to generally contribute the majority of the noise.
Noise is also created by the cordless transmission. Different styles of transmitters are available that work at different frequencies. The most inexpensive sort of transmitters employs FM transmission and commonly broadcasts at 900 MHz. FM transmitters are extremely prone to cordless interference which is why newer types usually employ digital music broadcast. This kind of audio transmission provides better signal-to-noise ratio than analog type transmitters. The amount of hiss is dependent on the resolution of the analog-to-digital converters as well as the quality of other parts. Most of modern cordless loudspeaker use amplifiers which are based on a digital switching topology. These amplifiers are named “class-D” or “class-T” amplifiers. Switching amps include a power stage that is constantly switched at a frequency of around 400 kHz. This switching frequency is also hiss that is part of the amplified signal. On the other hand, latest wireless loudspeakerspecifications usually only consider the hiss between 20 Hz and 20 kHz. The most common method for measuring the signal-to-noise ratio is to couple the wireless loudspeaker to a gain which allows the maximum output swing. Then a test tone is fed into the transmitter. The frequency of this tone is generally 1 kHz. The amplitude of this tone is 60 dB below the full scale signal. After that, only the noise between 20 Hz and 20 kHz is considered. The noise at different frequencies is removed by a filter. Next the amount of the noise energy in relation to the full-scale output wattage is calculated and shown in decibel. Frequently the signal-to-noise ratio is expressed in a more subjective manner as “dbA” or “A weighted”. In other words, this method attempts to state how the noise is perceived by a human. Human hearing is most sensitive to signals around 1 kHz whereas signals under 50 Hz and above 14 kHz are barely noticed. The A-weighted signal-to-noise ratio is typically higher than the unweighted ratio and is published in the majority of cordless speaker spec sheets.
Have you ever wondered what some of the technical language means that vendors take in order to show the performance of wireless outdoor speakers shown at www.amphony.com? In this article, I am going to clarify a commonly used specification: THD or “total harmonic distortion”. It is often hard to pick a suitable pair of wireless speakers given the huge amount of products. Aside from looks, you will often be confronted with having to examine a few of the technical specifications. THD is usually not as easily understood as some other frequently utilized terms such as “signal-to-noise ratio” or “frequency response”. THD is expressed either in percent or in decibel and shows how much the signal that the speaker outputs differs from the audio signal that is input into the speaker. The percentage given as THD describes which amount of energy which is radiated by the speaker are higher harmonics versus the original audio. 10% would mean that one 10th is distortion. 1% would mean one hundredth et cetera. 10% is equal to -20 dB whilst 1% equals -40 dB.
Harmonic distortion in a wireless loudspeaker is really the consequence of a few components, such as the power amplifier which is built into the speaker in order to drive the loudspeaker element. The audio amplifier itself is going to have a specific level of distortion. Normally the distortion of the amplifier will be higher the more output power it supplies to the speaker. Generally producers will show amp distortion based on a specific amount of output power, by and large a lot less than the rated highest amplifier output power. Distortion ratings for various output power levels are usually provided for a few output power levels or as a diagram listing distortion versus output power. Both of these methods allow to better evaluate the quality of the amplifier.Furthermore, please note that distortion typically is measured for a specific test tone frequency. Commonly a 1 kHz sine wave tone is used during the measurement. This allows evaluating equipment from different vendors. Though, distortion normally varies with different frequencies. Many digital amps will show growing distortion amid higher frequency which cannot easily be discovered by glancing at the spec sheet. The next contributing factor is the loudspeaker element itself. The majority of loudspeakers use a diaphragm type driver that is driven by a coil that is suspended in a magnetic field. The magnetic field is excited by the music signal. The change in magnetic flux, however, is not entirely in sync with the music signal due to core losses and other factors. In addition, the type of suspension of the diaphragm will create nonlinear motion. As such the result is distortion brought about by the speaker element. Most suppliers are going to publish harmonic distortion based on the power level as normally the higher the speaker is driven the higher the level of distortion. The overall distortion of the speaker thus is the total of the amplifier distortion in addition to the speaker element distortion. On top of that, there are different contributing factors. The loudspeaker enclose is going to shake to some extent and thus add to the distortion.
In order to find out the total distortion of a speaker, a signal generator is used that provides an ultra-linear signal to the loudspeaker and also a measurement microphone which is connected to an audio analyzer to determine the amount of harmonics emitted by the speaker. On the other hand, pure sine signals hardly give an accurate indication of the distortion of the cordless speaker with real-world signals. A better distortion analysis is the so-called intermodulation distortion analysis where a test tone which consists of a number of sine waves is used. Then the level of harmonics at other frequencies is calculated.
In addition, please note that many wireless speakers are going to experience signal distortion during the audio transmission itself. This is mostly the case for transmitters that use analog or FM type transmission. Digital audio transmission on the other hand has the smallest amount of signal distortion. The music is digitized within the transmitter and not affected during the transmission itself. Digital wireless audio transmitters are available at 2.4 GHz and 5.8 GHz.
Today’s wireless speakers produced by Amphony come in all shapes and sizes. Finding the perfect type for your application can often be tough. There is a large number of various names and terms describing loudspeaker performance. In addition, every producer shows a large amount of specs, including “sound pressure level”, “dynamic range” and so forth. In this article, I will have a closer look at one of the most fundamental of these terms: “loudspeaker output power”. This specification is also recognized as “speaker wattage”.
If you are going to buy a couple of loudspeakers to set up in your house, you will often be faced with a series of odd technical jargon describing its performance. But how do these numbers relate to how the speaker sounds and how are those to be interpreted? Now I am going to provide some details regarding “loudspeaker output power”. This specification is frequently misunderstood. It is important to look rather closely at how the producer publishes this spec.
“Wattage” shows how loud your loudspeaker can sound. Depending on your application, you can choose a small speaker tolerating only several watts or a bigger one tolerating a few hundred watts. Many smaller home speakers only can be driven with a few watts power which typically is adequate for a small room. If you intend to shake your walls then you clearly wish to opt for a speaker that has up to several hundred watts. Please note that many speakers will start distorting the audio once the audio reaches higher wattage. If you want to enjoy low-distortion music then you may want to go with a speaker which is going to give you more wattage than you will really require.
Power is either shown as “Watts peak” which means the loudspeaker can tolerate quick burst of this amount of power or “Watts rms” which shows how much power the speaker may tolerate for a longer period of time. The peak specification has been somewhat abused by vendors stating enormous peak audio power while their loudspeakers are in reality very small and unable to handle more than merely several watts rms power.
Music and voice is not constant in terms of loudness. As such the peak power spec is nonetheless important, though not as vital as the rms power spec. Ideally the loudspeaker is going to display both the rms and peak power rating. Having a high peak power spec will ensure adequate headroom for power peaks that are common in audio signals. Having enough headroom is crucial given that music signals vary a great deal from sine wave signals that are utilized to determine rms power. Brief peaks of large wattage are frequently found in music signals. These bursts will drive the speaker into high distortion unless the peak wattage is large enough.
Generally the impedance of the loudspeakers that you connect to your power amplifier is going to determine how much output power your amp may provide. Speaker impedance is measured in Ohms. Usually speakers have an impedance between 4 and 8 Ohms. Amplifiers have a restricted output voltage swing as a result of the fixed internal supply voltage. As such the highest output power of your amplifier will vary depending on the speaker impedance. The lower the speaker impedance the bigger the maximum power your amp may provide. Usually a 4-Ohm loudspeaker is used as a reference.
Getting and installing good speakers for out of doors can be very difficult since there are several parameters to take into consideration. I am going to offer some pointers that will help you prevent some of the pitfalls and also help you find the perfect product.
Outdoor speakers appear in all shapes and sizes and thus it’s often frustrating to make an educated decision. When you’re seeking out-of-doors speakers then there are several important things to check out, many of which might not be so evident.
The loudspeaker itself has to be water-resistant or watertight to stand up to the elements. Typical outdoor speakers possess a plastic housing to resist rain. In addition, a UV tolerant covering paint will keep the color of the speaker even if subjected to sunshine. In the event the loudspeaker contains metal elements such as the front cover or possibly a metal bracket then these should either be created from non-corrosive materials or specially treated substances which wonâ€™t corrode. Another aspect to bear in mind would be the speaker wattage.
The audio behavior of outdoor loudspeakers differs from the behavior of indoor speakers since the sound is not contained in an area. Because of this the sound is going to travel freely everywhere and not be contained inside the room. Hence, outdoor loudspeakers need greater wattage so as to reach the same loudness as indoor loudspeakers. Furthermore, there is usually far more noise outside the house coming from automobile traffic and also wind noise which could drown out the loudspeaker. So a speaker with just a few watts of wattage won’t offer adequate power for outdoors yet may be best for indoors. Running long speaker cables is another big problem considering that there commonly is no pre-wiring in place outside the house. Digging up trenches to conceal loudspeaker cable can also cause damage to your flower beds and also cross through obstacles like retaining walls. As a result one option to take into account are cordless outdoor loudspeakers (Click here now in order to study helpful info in relation to wireless speaker systems). Cordless speakers are handy since they get rid of long speaker wire runs. The music journeys from a transmitter that connects to your source to the speakers by air. The signal is able to travel through walls and other hurdles. Typically the transmitter will be inside your house. As a result be sure that the transmitter provides enough range in order to safely link the length to your speakers. Wireless loudspeaker vendors usually specify a maximum working range. Use caution though as this operating range is normally given for perfect conditions. In the real world the actual range of the speakers will be less. How much less is determined by the setup. Partitions and other obstructions will reduce the operating range because the wireless signal gets weaker every time it has to traverse a door.
Further, ensure that the cordless signal is robust against interference. There may be cordless LANs as well as other wireless products in the region which can shut down your speaker except if the cordless transmission features a system to cope with this sort of interference. A number of strategies for avoiding interference are adaptive frequency hopping and also error correction. Adaptive frequency hopping will examine all frequency channels and avoid channels occupied by other products. Error correction can repair data which was dropped or damaged during the transmission. Lastly, it is best to opt for a transmitter that offers all of the audio inputs that you will demand in other to conveniently connect with your home audio system or your ipod device, such as audio line inputs or amplified speaker inputs. Uncover more reading from http://www.cringely.com/2008/12/26/the-missing-link/.
Cell phones have changed a great deal. Virtually all smartphones marketed currently are smartphones. These kinds of cell phones provide you with a great deal of functions not available in previous telephones such as the capability to keep as well as play audio. Ordinarily you will hear the songs saved on your mobile phone by utilizing some headphones. However, the audio quality of earbuds provided with cell phones is commonly quite bad. The majority of speakers give greater audio quality than tiny headphones. By connecting your cellular phone to some active speakers, it is easy to improve your listening experience. Should you be looking for a method to send tracks from your smartphone to a pair of stereo speakers then you can find a number of alternate options to select from. Below I’ll analyze a few of those options in order to offer you a better idea about what is available. There are actually various alternatives on the market for linking speakers to a smartphone. You are able to hook up your loudspeakers to your cellular phone by means of cable and also cordlessly. Cordless is more practical compared to using a cord. Bluetooth music receivers, for example, enable transmitting of audio by way of Bluetooth. These types of receivers may acquire the wireless signal from your cellphone plus retrieve the tracks. Bluetooth audio streaming is typically done by the commonly found A2DP or the more recent AptX standard protocol.
You’ll be able to attach Bluetooth audio receivers to any kind of active loudspeakers. Having said that, most loudspeakers available on the market are actually passive. To be able to connect to a passive loudspeaker you will need to utilize an external audio amplifier. Integrated Bluetooth wireless amps, on the other hand, do not require a separate power amp. Sadly, the cordless range of Bluetooth is rather limited. Typically you can’t broadcast in excess of 30 feet. What this means is you happen to be restricted to a single room. Apart from smartphones, lots of other gadgets understand Bluetooth and can also transmit to those kinds of audio receivers.
An additional option is Airplay. Airplay is an Apple proprietary standard which permits transmitting of uncompressed audio. Then again, remember the fact that the tunes stored on your cellular phone is usually compressed by using the MP3 or AAC standard and as a result using Airplay is not going to enhance the sound quality. If however you have got uncompressed audio available then working with Airplay makes a lot of sense. AptX is a compromise between the common A2DP standard and Airplay. Several older cell phones, however, usually do not yet support AptX.
Instead of using a Bluetooth stereo adapter, you may want to look at Bluetooth cordless loudspeakers. Those speakers can receive tracks directly from your phone without using a standalone receiver. You can find many models available on the market. Bluetooth loudspeakers are typically quite small. Because of this, they often are lacking with regard to sound quality. Experiment with any kind of model prior to purchasing any Bluetooth stereo speakers to avoid an upsetting surprise. For this reason making use of a separate Bluetooth receiver is still a good option if you do not require a transportable product. Furthermore, whether or not you decide to acquire a couple of Bluetooth loudspeakers or a Bluetooth music receiver, you should test the product at your retailer to make sure it works with your mobile phone considering the fact that the firmware of each cell phone may differ to some extent.
Power amplifiers are at the very center of each home theater system. As the quality and output power requirements of modern loudspeakers increase, so do the demands of music amplifiers. There is a big quantity of amplifier styles and models. All of these differ regarding performance. I will describe a few of the most common amp terms including “class-A”, “class-D” and “t amps” to help you figure out which of these amplifiers is best for your application. In addition, after understanding this essay you should be able to understand the amp specs that producers publish.
The fundamental operating principle of an audio amp is fairly simple. An audio amp will take a low-level audio signal. This signal typically originates from a source with a comparatively high impedance. It subsequently converts this signal into a large-level signal. This large-level signal can also drive loudspeakers with small impedance. To do that, an amplifier makes use of one or more elements that are controlled by the low-power signal to produce a large-power signal. Those elements range from tubes, bipolar transistors to FET transistors.
A number of decades ago, the most common kind of audio amp were tube amps. Tube amplifiers utilize a tube as the amplifying element. The current flow through the tube is controlled by a low-level control signal. Thereby the low-level audio is transformed into a high-level signal. Unfortunately, tube amplifiers have a rather high amount of distortion. Technically speaking, tube amplifiers will introduce higher harmonics into the signal. Many people prefer tube amps because these higher harmonics are regularly perceived as the tube amp sounding “warm” or “pleasant”.
A disadvantage of tube amplifiers is their small power efficiency. In other words, most of the energy consumed by the amplifier is wasted as heat as opposed to being converted into music. Thus tube amps will run hot and require enough cooling. In addition, tubes are fairly costly to produce. Hence tube amplifiers have by and large been replaced by solid-state amplifiers which I am going to look at next.
Solid state amps replace the tube with semiconductor elements, usually bipolar transistors or FETs. The earliest kind of solid-state amps is called 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 models. Class-A amps, on the other hand, waste most of the energy as heat. As a result they typically have large heat sinks and are fairly heavy. By utilizing a number of transistors, class-AB amps improve on the low power efficiency of class-A amplifiers. The working region is divided into two distinct regions. These two areas are handled by separate transistors. Each of those transistors works more efficiently than the single transistor in a class-A amplifier. As such, class-AB amps are generally smaller than class-A amplifiers. When the signal transitions between the 2 separate areas, however, some amount of distortion is being generated, thereby class-AB amps will not achieve the same audio fidelity as class-A amplifiers. In order to further improve the audio efficiency, “class-D” amplifiers use a switching stage that is continuously switched between 2 states: on or off. None of these two states dissipates power within the transistor. Consequently, class-D amplifiers frequently are able to attain power efficiencies beyond 90%. The on-off switching times of the transistor are being controlled by a pulse-with modulator (PWM). Standard switching frequencies are between 300 kHz and 1 MHz. This high-frequency switching signal has to be removed from the amplified signal by a lowpass filter. Generally a straightforward first-order lowpass is being used. The switching transistor and also the pulse-width modulator generally have rather big non-linearities. As a result, the amplified signal will contain some distortion. Class-D amps by nature exhibit higher audio distortion than other kinds of mini amplifiers. New amps include internal audio feedback in order to minimize the level of audio distortion. A well-known architecture that makes use of this type of feedback is called “class-T”. Class-T amps or “t amps” achieve audio distortion that compares with the audio distortion of class-A amps while at the same time offering the power efficiency of class-D amps. Consequently t amps can be made extremely small and yet achieve high audio fidelity.
Let me have a look at the word “power efficiency” that lets you know how much wireless loudspeakers squander to aid you to select a pair of cordless loudspeakers.
Several issues are the result of cordless speakers that have low power efficiency: Low-efficiency wireless loudspeakers will squander a certain amount of energy as heat and so are more expensive to operate when compared with high-efficiency models due to their greater energy consumption. Heat will not dissipate well through tiny surfaces. Consequently low-efficiency wireless speakers must use heat sinks. Heat sinks as well as fans are heavy, consume room and also produce noise. Cordless loudspeakers with low efficiency can not be put into tight spaces or inside sealed enclosures as they need a good amount of circulation. Wireless speakers with small efficiency need a bigger power supply to output the identical amount of music power as high-efficiency types. An increased level of heat causes further stress on elements. The life expectancy of the cordless loudspeakers could be lowered and reliability could be compromised. High-efficiency cordless loudspeakers in contrast don’t suffer from these issues and can be built very small.
The power efficiency is displayed as a percentage in the wireless speakers data sheet. Various amp topologies deliver different power efficiencies. Class-A amplifiers are usually the least efficient and Class-D the most efficient. Normal power efficiencies range between 25% to 98%. The higher the efficiency figure, the less the amount of power squandered as heat. A 100-Watt amp which has a 50% efficiency would have a power consumption of 200 W. What is less known about efficiency is the fact that this figure isn’t fixed. Actually it differs depending on how much energy the amp offers. For that reason in some cases you will discover efficiency figures for several energy levels in the data sheet. Every music amp will consume a specific amount of energy regardless of whether or not it supplies any kind of power to the loudspeaker. Because of this the smaller the power the amplifier delivers, the lower the power efficiency. For this reason audio producers normally specify the efficiency for the highest audio power that the amplifier can deliver. In order to figure out the efficiency, the audio energy that is consumed by a power resistor which is attached to the amplifier is divided by the total energy the amplifier utilizes whilst being fed a constant sine wave tone. Ordinarily a full power report is plotted to display the dependency of the efficiency on the output power. For this reason the output power is swept through several values. The efficiency at each value is tested plus a power efficiency graph generated.
Wireless speakers that employ switching-mode amplifiers have a switching stage that causes some amount of non-linear behavior. Therefore bluetooth outdoor loudspeakers that use Class-D amps usually offer smaller audio fidelity than types utilizing analog Class-A amplifiers. Subsequently you will need to base your decision on whether you need small dimensions and low energy consumption or maximum music fidelity. Then again, digital amps have come a long way and are providing improved audio fidelity than in the past. Wireless speakers that use Class-T amps come close to the audio fidelity of products that contain analog amplifiers. Therefore selecting a set of cordless speakers which utilize switching amp with good music fidelity is now feasible.