Subwoofer

Subwoofers are specialised speakers designed to reproduce low frequencies - also known as bass - with precision and power. They are particularly important for enhancing the listening experience in home cinema systems or when playing music, as they extend the sound into the lower frequency ranges. Unlike standard speakers or soundbars, which cover a broader sound spectrum, subwoofers focus exclusively on low frequencies and deliver impressive bass reproduction. Find out more here about the features, the different models of subwoofers, key buying criteria and how a subwoofer can improve your TV’s sound quality.

What are subwoofers?

Subwoofers are specialised (TV) speakers designed to reproduce low frequencies, also known as bass, with precision and power. They are particularly important in home cinema systems to enrich the soundscape and allow you to experience the full sound of films, music or other audio sources. Unlike soundbars, standard speakers or compact speakers, which cover the full sound spectrum, subwoofers focus exclusively on the lower frequencies, typically in the range of 20 to 200 Hz. They can be used as standalone speakers or combined with other speakers to extend the sound spectrum and produce a more dynamic TV sound.

Sound quality of subwoofers

Subwoofers are designed to produce deep, powerful bass, which plays a central role in many action scenes in films. They enable precise and punchy bass reproduction that cannot be achieved with a television’s built-in speakers or conventional standard speakers. Particularly in films and scenes that rely on low frequencies, subwoofers deliver the necessary richness of sound that intensifies the listening experience. The difference in sound is also audible in musical elements in the lower registers, as subwoofers expand the sound dynamics in a way that cannot be fully replicated by other internal or external speakers.

Subwoofer functions and models

Subwoofers come in various sizes and designs. They can be either passive or active. Passive subwoofers require an external amplifier, whilst active subwoofers already have a built-in amplifier, making them easier to use. Some subwoofers are available in compact models that are well-suited to smaller rooms, whilst larger models offer more power and deeper bass reproduction. There are also models designed specifically for integration into home cinema systems, featuring special settings to adapt the sound to the room’s acoustics.

Some subwoofers are equipped with controls that allow you to adjust the bass intensity and feature low-pass filters that ensure only the low frequencies are transmitted without affecting the sound from the other speakers.

What should you look out for when buying a subwoofer?

When buying a subwoofer, there are several important factors to consider in order to make the best choice for your home cinema system. Firstly, the size of the room plays a key role. The larger the room, the more powerful the subwoofer should be to ensure that the low frequencies are reproduced clearly and powerfully. In small rooms, more compact models may also suffice. The power and size of the subwoofer are also crucial. Larger models generally offer deeper and more powerful bass reproduction, though smaller subwoofers can also be very effective in less demanding applications.

Another important consideration is amplifier compatibility. If the subwoofer is passive, it requires an external amplifier to function properly. Active subwoofers, on the other hand, have a built-in amplifier, which simplifies installation and often enables better sound reproduction. Connection options should also be considered. Standard connections such as LFE, HDMI or optical inputs enable simple and lossless audio transmission between the subwoofer and other devices, particularly in home cinema systems. Modern models often also offer Bluetooth functionality, which allows for wireless streaming of audio sources.

Furthermore, settings such as bass control and volume control are important. Many subwoofers offer options to adjust the sound to suit the room’s acoustics and your personal preferences. Some models even feature automatic room calibration to achieve the best possible bass reproduction. A subwoofer that is well-suited to the room and the existing speaker system can significantly enhance the listening experience and improve overall sound quality.

Subwoofer connections

Subwoofers often offer a variety of connection options to integrate them into different audio systems. The most common connections are:

LFE (Low-Frequency Effects): The LFE connection is specifically designed for the transmission of low frequencies and is frequently used in home cinema systems to connect the subwoofer to the rest of the audio system. This connection is particularly important for accurately and clearly reproducing the deep bass frequencies that play a significant role in many action films or music tracks. The LFE connection ensures that only the low frequencies are transmitted to the subwoofer, thereby achieving precise bass reproduction without distortion or interference from the mid and high frequencies.

HDMI: HDMI (High Definition Multimedia Interface) is a digital connection used for transmitting both audio and video signals. In subwoofers, the HDMI connection is frequently used for home cinema systems, as it enables lossless, high-quality audio transmission. HDMI is a preferred choice, particularly for modern home cinema systems that offer high sound and picture quality. One advantage of HDMI is that it allows for easy integration of subwoofers without the need for separate cables for audio and video. Furthermore, HDMI ARC (Audio Return Channel) offers the option of sending audio from the TV back to the subwoofer or amplifier, which simplifies setup.

Optical input (Toslink): The optical input, also known as Toslink, is a digital connection that uses light pulses to transmit audio data. This type of transmission is particularly advantageous as it avoids interference and noise that could be caused by electromagnetic interference. The optical connection is frequently used to connect subwoofers to televisions, Blu-ray players or other audio devices, ensuring clear and interference-free audio transmission. As the optical input uses a digital connection, high sound quality is guaranteed, particularly with modern audio devices that support this type of transmission.

RCA: The RCA connector, also known as RCA, is an analogue connection that is particularly common in passive subwoofers and other audio components. This type of connection usually uses two cables, one for the left channel and one for the right channel, to transmit the audio signals. Although RCA connections are somewhat outdated nowadays and cannot compete with digital options such as HDMI or optical inputs in terms of sound quality and bandwidth, they still offer a simple and cost-effective way to connect subwoofers and other audio devices. The RCA connection is a common solution, particularly for older devices or passive subwoofers that do not have a built-in amplifier.

Advantages and disadvantages of subwoofers

Advantages:

• Subwoofers offer the ability to produce deeper and more powerful bass, which enhances the listening experience, particularly with music and action films.
• When combined with other speakers, subwoofers expand the sound spectrum and contribute to a fuller and more dynamic sound.
• Many subwoofers can be placed flexibly within the room, depending on the acoustics and personal preferences.

Disadvantages:

• Subwoofers require more space than smaller speakers, which can be a disadvantage in smaller rooms.
• Subwoofers increase the cost of the entire speaker system, particularly for higher-powered models.
• Passive subwoofers require an additional amplifier, which makes setup and installation more complex.

The OSKAR TV speaker also features a built-in subwoofer as a passive driver for optimised bass reproduction.