Modern home theatre systems require a receiver as one of their components. Receivers can be audio-video (AV) or digital video recorder (DVR). AV receivers help to centralise the home theatre system by connecting the devices and providing them with input or transmitting output. DVR receivers record video signals from the television and store the content on an internal hard drive. DVR receivers can also deliver video signals to other devices, such as computers, or to the internet, which enables them to share recorded content with a wide audience. Wireless receivers interact with the devices over the air. Wireless technology enables buyers to reduce the number of cables used to connect home theatre systems.
Before buying a wireless receiver on eBay, it is useful to understand wireless technology and the types of wireless receiver that are available and the range of features that they offer. This helps the buyer to search for the right type of wireless receiver using eBay's easy to use website.
Devices that use wireless technology do not have cables for transmitting the signals: instead, the signals are sent over the air. Wireless technology is common for computers as many laptops and netbooks connect to the internet through Wi-Fi. In the case of wireless receivers, the sent signals are electromagnetic. The transmitter generates electrical signals that are picked up by the wireless receiver and passed on to other devices. The range of a wireless receiver varies and it depends on the transmitter's power and the type of Wi-Fi chip.
Types of Wireless Receiver
There are two main types of wireless receiver, AV and DVR. Each type has a range of features, and understanding these helps a buyer to decide which receiver matches their requirements before they start to shop on eBay.
Wireless AV Receiver
Typical AV receivers act as tuners for AM/FM, high-definition, and internet radio. They are also preamplifiers that control the selected audio and video sources and amplifiers that provide power to the speakers. AV receivers process the incoming sound signals and distribute the audio to the speaker channels and the subwoofer. At the same time, they send video signals to the television. Wireless technology means that television signals can be sent to multiple rooms. There are several features that should be considered when choosing an AV receiver.
Power Ratings for a Wireless AV Receiver
The power rating of a wireless AV receiver refers to the power it can output per channel. The continuous power feature defines the output power that the receiver can deliver over a certain period of time. A good receiver can provide enough power to maintain a desired volume level. The power rating is important, but it does not determine the quality of sound.
Sound Levels for a Wireless AV Receiver
The sound levels for a wireless AV receiver refer to the loudness of the output and are measured in decibels (dB). The weakest sound heard is 0 dB, while whispers in library are around 30 dB. Normal conversation falls somewhere between 60 and 65 dB, and ears can start to hurt when the sound exceeds 125 dB. A more powerful sound level is required for home theatres in larger spaces so that the sound can reach all corners of the room.
Sound Distortion for a Wireless AV Receiver
The sound distortion value refers to the amount of noise a wireless AV receiver can produce. A distortion of 5 to 10 percent makes the receiver unlistenable, while a distortion of 0.01 to 0.08 percent provides excellent sound. The percentage shows how much of the audio at full output level would be distorted.
Signal-to-Noise Ratio for a Wireless AV Receiver
The signal-to-noise ratio defines the relationship between the output sound and background noise, and is measured in dB. Larger ratios are desirable because this means that the audio is better separated from the background noise and acoustic effects. A signal-to-noise ratio of 70 dB is good, while 50 dB is not desirable.
Dynamic Headroom for a Wireless AV Receiver
If the wireless AV receiver can output more power than listed in its specification for a short period of time, for the peaks in music or extreme sounds, then it can perform well in a home theatre setting. This feature is called the dynamic headroom and is measured in dB. A receiver with a dynamic headroom of 3 dB is able to double its power output for a short burst of time.
Multi-Zone Audio for a Wireless AV Receiver
If the AV receiver supports multi-zone audio, it can control two source devices at the same time. This means that it is possible to watch television in one room and listen to music in another using a single AV receiver.
Networking for a Wireless AV Receiver
AV receivers that connect to the internet via Wi-Fi or ethernet offer advanced networking abilities. Content can be shared and streamed online, which allows for easy updating.
Video Compatibility for a Wireless AV Receiver
The wireless AV receiver is the central hub that receives the input signals and transmits the outputs, so it needs to be compatible with many video formats. Before buying an AV receiver, the formats should be checked. The video converting feature allows for even more formats to be accessed by simplifying the connecting of the receiver and the television.
Video Processing for a Wireless AV Receiver
Deinterlacing and video upscaling are desirable video processing features that can be found on some AV receivers. Deinterlacing involves converting interlaced video signals into progressive scan, which improves the image quality by making it smoother. After deinterlacing, upscaling changes the number of pixels so that they match the required screen resolution. These features mean that images look better when displayed on a high-definition television.
Wireless DVR Receivers
DVRs are digital video recorders and a successor to the VCR used to record content onto VHS tapes. A DVR contains a hard drive on which files are stored. DVRs can store television content and allow the viewer to watch it later and skip the advertisements, if desired. DVRs are convenient to use because previously recorded programmes can be viewed while other programmes are in the process of being recorded. DVRs with an integrated wireless receiver do not have to be connected with other devices because the signals are transmitted over the air and received with special antennas. Wireless DVR receivers can be accessed and operated using a remote control.
Alternative Uses for Wireless DVR Receivers
Wireless DVR receivers are not only used in devices that record live television. They can also be found in security cameras. In this case, the wireless receiver transmits the picture from the camera to a computer in order to provide easy monitoring of any area. Without wires, the security system is less noticeable and therefore more likely to capture relevant images. These receivers usually have an extended range, so the signals can be transmitted through walls, floors, ceilings, and other obstacles.
Wireless technology reduces the number of cables in a room and can transmit over great distances by sending electrical signals through the air. Wireless receivers can be categorised as AV or DVR receivers. Wireless AV receivers are a central part of a home theatre system and combine functions of a tuner, amplifier, and preamplifier. They receive and deliver signals between different devices and can transmit television broadcasting signals even to another room. When choosing an AV receiver, several features should be considered, including power rating, sound distortion, signal-to-noise ratio, dynamic headroom, sound levels, video processing technologies, compatible video formats, and networking types.
Wireless DVR receivers are integrated into digital video recorders that store live television programmes on their internal hard drives. Wireless DVR receivers connect the DVR to other devices, such as a television. Alternative uses for DVR receivers are in security cameras where they are beneficial because of their extended range. They are easier to conceal because they have no cables. eBay sellers offer a wide selection of AV and DVR wireless receivers.