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Active speakers, known as powered speakers, have built-in amplifiers, which eliminate separate external amplifiers. These speakers are available with different amplifiers.
Class A amplifier
Active speakers with a Class A amplifier have a simple and straightforward circuit. The circuit has transistors that are always on, regardless of signal size. So, even tiny signals pass through completely. Class A amps have low distortion and sound good, but they are not very efficient. Most of the power ends up as heat, not sound. About 20% of the input power converts into audio. The amplifiers are ideal for low-power applications like radios or small intercoms because of their sound quality.
Class B amplifier
Class B amps improve efficiency compared to Class A by having output transistors turn on halfway. The transistors only conduct during positive or negative halves of the waveform. They have around 50% efficiency. However, Class B amps can produce crossover distortion at low volumes. The distortion happens when the signal level is near the point where the transistors turn on and off. So, they are mostly used for low-cost battery-powered devices where efficiency matters more than sound quality.
Class AB amplifier
Class AB amplifiers combine the strengths of Class A and Class B amps. They use a Class A biasing method at low signal levels for smooth output. At high volumes, the amp transitions to the higher efficiency Class B circuit. This design reduces distortion at low volumes while improving power efficiency for a more dynamic sound. The efficiency is around 25%. Most modern audio equipment uses Class AB amps because of the good sound quality and reasonable cost.
Class D amplifier
Their small size and light weight make them popular for portable powered speaker applications. Modulation techniques like PWM and PDM help minimize distortion while maximizing efficiency, around 90%. Class D amps use switching circuits that turn output transistors on and off very fast. They amplify the signal by rapidly switching at audio frequencies.
An active speaker with Bluetooth might have the following features and functions:
Built-in Amplifier
Generally, both passive and active speakers exist. Passive speakers need an outside power source to amplify audio signals. However, active speakers have a built-in amplifier that amplifies audio signals. Active speakers' amplifier types and power levels vary. The amplifier is an indispensable component because it determines the speaker's maximum volume and sound quality. Generally, a speaker with a more powerful amplifier can play louder, and those with higher-quality amps can produce better sounds.
Audio Sources
Active speakers get audio signals from different sources, depending on the model. The Bluetooth model gets audio signals from Bluetooth-enabled devices like TVs, phones, and tablets, among others. Other examples are USB devices, auxiliary cables, audio cables, and wired microphones. The cables create a physical connection between the speaker and audio source. Signals travel through wires, connecting them to amplifiers and, eventually, the speaker drivers. Wires for connecting are not included. Although they allow seamless audio transmission with little interference, active speakers using cables don't provide the same convenience and flexibility as wireless connections.
Controls and Features
Active speakers have controls for adjusting volume levels and other settings. Some have basic dials or buttons for control. Others have more advanced control systems with LED displays and remote controls. Features like tone control, multiple inputs, and built-in Bluetooth or FM radio might be offered.
Power Supply
Like most electronic devices, active speakers need a power supply to function. Models with built-in rechargeable batteries can be recharged when running low. They are more portable and versatile than those with AC power cords. The power supply connects the speaker's internal circuits to its amplifier, bringing the required voltage and current to work.
Active speakers equipped with power supply or speaker amplifiers find applications across diverse settings due to their versatility and convenience. Below are common uses:
Personal Computer Sound Systems:
Many individuals utilize active speakers with amplifiers to enhance the audio quality of their computers. The speakers offer superior sound compared to conventional computer speakers. This upgrade provides richer and clearer music and media for a more enjoyable experience. Gamers also benefit from the detailed audio cues for a competitive edge in the game.
Home Theater Systems:
Homeowners seeking an immersive home entertainment experience increasingly use anohm speaker amplifier and active speakers in their home theaters. The setup allows for multichannel surround sound systems that produce pleasant audio. Music lovers also use the speakers to create a more immersive auditory experience with higher music quality.
Small Venue Sound Systems or Musicians:
Musicians who perform at small venues appreciate the convenience of active speakers with integrated amplifiers. The devices work together to produce high sound power without requiring much space or additional equipment. Music bands can easily transport the active speaker systems and use them for sound reinforcement during gigs, band performances, or when creating bands' practice studios.
Gaming Console Sound Systems:
Active speakers can also be connected directly to the gaming console. This use offers better sound than the usual TV speakers. The experience is more immersive and greatly enhances the gaming experience. Additionally, frustration over tangled audio cables is eliminated since the speakers can easily be connected wirelessly.
Desktop Computer Studio Monitor Speakers:
Active speakers are valued for their accurate sound reproduction, which makes them suitable for recording and music production studios. Music producers and sound engineers use these powered speakers to monitor mixed and mastered tracks as they assess their quality before distribution. Musicians can also use them to identify any distortions when playing musical instruments.
PA Systems for Small Events:
Small event organizers use active speakers with amplifiers for public address systems. The speakers are convenient for occasions like outdoor gatherings, presentations, or parties where a portable sound system is needed. Because of their portability, the speakers can easily amplify speech and music entertainment and are therefore suitable for small events in both indoor and outdoor spaces.
Finding the right power amplifier for active speakers is essential to ensuring system performance and reliability. Business purchasers must first consider speaker compatibility - what speakers are they trying to amplify? Next, think about the sound they want to produce. Do they want a warmer sound or one with higher frequencies and harsher tones? Different amplifiers offer different options for equalization.
Next, buyers should evaluate power and effectiveness - how big are the rooms or venues where the speakers will be used? The amplifier's power rating needs to match the requirements of their specific situation. Another consideration is the amplifier's effectiveness at converting power from the electrical network into audible sound without wasting too much in heat form. This means less energy is used by it, which could increase operating costs. Buyers also need to ensure that there are enough connection options on the amp to accommodate all of their sources as well as that the amp itself has flexible ones.
Another step is to review features such as built-in crossovers, limiters, etc., that may enhance overall performance/dependability depending upon application-specific needs/requirements. Limiters, for example, help prevent distortion at higher volumes, while crossovers enable different frequency ranges to be sent to various speaker types during multi-speaker setups. This ensures clarity across all units involved.
Finally, purchasing group buyers should research durability and support to ensure contented longterm use. They must look at user reviews, warranty provisions, etc., for guidance regarding this issue.
Q: How do users connect an amplifier to an active speaker?
A: Active speakers already have amplifiers built inside them. So, users only need to connect their audio source directly to the speaker. Typical connections are through cables like 3.5mm aux, RCA, or XLR. If the speaker has Bluetooth, users can pair their phone, laptop or any other device. There's no need for an external amplifier for active speakers.
Q: What cables are required to connect the amplifier to the speakers?
A: Connecting an amplifier to its speakers requires a standard speaker cable. The cable usually has two wires in one piece. One wire contains a positive terminal marked with a plus sign. The other wire is negative with a minus sign. However, the cables do not need to match color codes. The two wires have to be connected to the same terminal on both the amplifier and the speaker to avoid phase cancellation.
Q: Can users connect a Bluetooth device directly to an active speaker?
A: Yes, if the speaker has a Bluetooth input, connect it to a Bluetooth device like a phone or tablet. The signal will wirelessly transmit to the active speaker. Otherwise, if the speaker does not have Bluetooth, the user will need to add a Bluetooth adapter that will allow connection to a compatible device.
Q: Do users need to ground amplifiers or mixers?
A: Grounding improves safety by reducing the risk of electrical shock. It also eliminates countless audio problems. While professional mixers and amplifiers have grounding terminals, it is not mandatory to ground them. Equipment can operate perfectly fine without grounding. However, it is best to ground them for devices that have 3-pin power sockets. Also, ensure all power cables and signal cables are of the same brand and type.
