Wireless speaker

Wireless speakers are composed of two units: a main speaker unit combining the loudspeaker itself with an RF receiver, and an RF transmitter unit. The transmitter connects to the audio output of any audio devices such as hi-fi equipment, televisions, computers, MP3 players, etc. An RCA plug is normally used to achieve this. The receiver is positioned where the listener wants the sound to be, providing the freedom to move the wireless speakers around without the need of using cables. The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet.[2]

The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings. Most manufacturers claim the signal transmits over a range of 150 to 300 feet (50 to 100 m). Many wireless speakers feature variable transmission channels that can be set using a tuning knob to overcome potential RF interference with other nearby wireless devices, such as cordless phones or baby monitors.

Some wireless speakers use the 2.4 GHz frequency band. The WiSA standard uses the 5 GHz frequency band.

Battery

A portable speaker which marks the lower end of the size range of Bluetooth speakers constructed primarily for the reproduction of music

Wireless speakers use rechargeable batteries to power them. Almost all wireless speakers operate on rechargeable batteries that are not replaceable, so that the lifespan of these speakers is that of their batteries. Some speaker models with a large battery capacity can also act as a power bank to charge another device to full capacity, such as a mobile phone.

They are generally recharged with either a C8 appliance plug or a more universal USB connector, mainly through either mini or micro-USB or USB-C connectors. Other speakers utilize proprietary connectors such as Apple's Lightning connector. The complete charging cycle a speaker generally varies from 3 to 6 hours.

Starting 2015, some wireless speakers integrate VOIP telephony functions.[4] Other models have an integrated FM radio. The higher end models add an LCD screen to make it easier to select and store radio stations.

Most wireless speakers have a built-in microphone, which allows to receive and make calls using a mobile phone in hands-free mode. When a call comes in, the music automatically shuts off and resumes as soon as the call ends.

With the development of voice assistants, manufacturers have integrated the ability to pair them with their devices. This way, commands can be passed to the speaker via the integrated microphone, which will then be executed by the voice assistant.[5]

A shower speaker attached to the wall of a shower with a suction cup

A shower speaker is a Bluetooth speaker designed for use in humid environments such as showers or more generally in the bathroom. There are also shower speakers using Wi-Fi, although this is more rare.

The speaker must first be paired with a Bluetooth device. In general, it is a smartphone or tablet. It is this device that will serve as the source for the music that will be played through the speaker.[6]

A shower speaker must first of all be able to withstand water splashes. This resistance is expressed by an IP (Ingress Protection) index that must be mentioned on the product. The most frequent indexes encountered are the IPX4 index, which indicates that the device is protected against splashes. Other models offer superior protection, such as IPX7. In this case, the enclosure is completely submersible in water to a depth of 1 meter for half an hour.[7] It is then considered waterproof. Some models, rarer those, extend their protection up to index 8.

The shower speaker must be able to be installed in all environments. This is why manufacturers have planned to equip their devices with different ways of fixing them. The suction cup is the most basic system and is found on entry-level speakers. Its main disadvantage is poor adhesion to the shower wall, which can cause the unit to fall off. The mounting bracket is the safest system to fix the speaker, but requires drilling a hole in the wall. The carabiner clip allows the speaker to hang from the shower curtain bar. It is only suitable for the smallest and lightest models.