Denon HEOS 1 HS2 review: specs and price

A speaker driver is an individual transducer that converts electrical energy to sound waves. More drivers may result in better sound quality.

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There is a control panel on the device body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.

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The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.

The device is dustproof and water-resistant. Water-resistant devices can resist the penetration of water, such as powerful water jets, but not being submerged into water.

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Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

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An amplifier is integrated into the device. An audio amplifier takes a small signal and makes it bigger without making any other changes in it which results in better sound, so any sound source can be connected to speakers.

Devices with a subwoofer have a higher quality, deeper bass.

A passive radiator is a type of driver (speaker) that doesn't have a voice coil and a magnet. The sound vibrations produced by a passive radiator depend on its mass and the size of its enclosure. It is usually used in combination with a woofer to produce deep bass tones.

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These microphones are designed to filter out background noise from the desired sound. Especially useful in noisy environments.

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This type of device allows you to listen at lower volume levels, causing less ear fatigue as you don't have to crank up the volume to overcome background noise. Ideal for plane rides and morning commutes.

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The battery can be recharged and used over again.

An indicator shows you when the device has low battery.

The manufacturer offers a branded wireless charging kit. To charge the device, you simply put it down on its charging base.

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The battery is removable and can be replaced by the user if broken.

You can use the device with standard batteries instead of a power supply.

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An auxiliary input allows you to play other audio sources by connecting them through a simple audio connection like a 3.5mm jack, i.e for MP3 or portable DVD/CD player.

The device can connect to Wi-Fi.

802.11ac wireless works on the 5GHz frequency range. It offers higher transfer rates, improved reliability and improved power consumption. It provides advantages for gaming and HD video streaming.

With a standard mini jack socket, you can use the device with most headphones.

Device supports fast Bluetooth pairing using NFC so it can communicate with other devices over Bluetooth. You can fastly pair devices without entering a code by simply holding one device next to the device with which it is to be paired.

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With more USB ports, you are able to connect more devices.

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Wireless devices allow users more freedom of movement.

The device has an option to mute/unmute a conversation directly from the device.

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With voice prompts, you will automatically receive information via audio messages – for instance, you may find out that the battery is running low, and it's time to recharge the device.

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You can use your voice to control key functions of the device and you can easily access your device without pushing any button.

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A sleep timer is a function that shuts off the power after a preset amount of time.

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A built-in FM radio tuner allows you to listen to most of the live-broadcasted FM radio stations without using the internet.