SE Audiotechnik B 21 Speaker

The SE Audiotechnik B 21 is a premium passive subwoofer developed specifically for live sound systems that require powerful, deep and well-controlled bass.

Belonging to the professional product line of the brand SE Audiotechnik (Germany), B 21 is not simply a bass player - it is the energy pillar for the entire system, helping to enhance performance quality in all environments from stages, bars and clubs to large-scale outdoor events.

Outstanding features of SE Audiotechnik B 21 Speaker

The SE Audiotechnik B 21 loudspeaker boasts an impressive range of specifications that represent the class of a professional stage audio device. With a design philosophy that focuses on long-term, flexible and stable performance, it is an ideal choice for professional sound engineers and event organizers. Some of the outstanding features include:

• 21 inch bass, 5 inch coil for deep and wide hitting force.
• RMS power 1000W / Peak 4000W, ready for big stages.
• Frequency range (-10dB) from 25Hz to 160Hz, excellent bass reproduction.
• Sensitivity 99dB, maximum SPL 142dB for huge volume but still clean sound.
• Bass reflex cabinet made of 15–21mm plywood, coated with super durable Polyurea paint.
• Omnidirectional sound coverage angle, spreading sound evenly in all directions.
• Neutrik speakON® professional connection port, supports multi-device link out.
• Ergonomic design with 4 handles, 8 rubber feet and M20 thread, easy to transport and install.

Detailed review of SE Audiotechnik B 21 Speaker

Design and manufacturing materials

The SE Audiotechnik B 21 is built with a 15 to 21mm thick plywood outer shell, ensuring the necessary rigidity for powerful bass and limited vibration. The Polyurea coating not only protects against scratches but also increases moisture resistance – ideal for touring environments.

The front is protected by a perforated, powder-coated steel mesh, ensuring maximum protection for the speaker membrane without blocking sound. With an overall size of 672 × 595 × 832 mm and a weight of 51 kg, the product is still easy to move thanks to the system of 4 ergonomic handles and 8 non-slip rubber feet.

Bass reproduction performance

The soul of the SE Audiotechnik B 21 Speaker is the 21-inch bass driver with a 5-inch voice coil, providing an impressive frequency response range from 25Hz – 160Hz (-10dB). The bass is reproduced deep and thick, but not boomy or rumbling thanks to the scientifically designed bass reflex structure.

The 33Hz – 130Hz (-3dB) response is ideal for pairing with mid-tops in a line-array system, helping to create a unified sound range from super bass to high. In practice, the B 21 performs very well with electronic music, EDM or kick drums that require precise and clean hitting force.

Impressive power and sensitivity

With 1000W RMS and 4000W peak power, the SE B 21 can operate continuously for many hours without losing performance. The sensitivity of 99dB allows the SE Audiotechnik B 21 to perform at its best even when connected to a not-so-large amplifier.

Most importantly, the peak SPL of 142dB puts it on par with flagship sub models from many of the world's leading brands. The 8Ω impedance also makes it easy to pair with today's popular 2-channel amplifiers.

Connectivity and expandability

The speaker's connection port system includes 4 speakON NL4 ports, allowing easy routing of input and output signals. The plugs are arranged in the form of 1+/1- for driver signals, 2+/2- to link other devices, very convenient for complex systems with many subs. In addition, the M20 thread on the top helps to attach standing speaker tubes or other accessories, flexible in configuration setup.

System compatibility and interoperability

The SE B 21 works ideally in a line-array system, paired with full-range speakers or high-power column speakers such as the SE L65 or mid-high lines from brands such as Electro-Voice, JBL.

In a bar or club environment, the B 21 can be combined with a DSP mixer or controller such as Xilica, DBX DriveRack, for optimal crossover adjustment. The speaker is also compatible with class H or class D amplifiers, as long as it meets the power level above 1000W at 8Ω.

Practical application of SE Audiotechnik B 21 Speaker

The SE Audiotechnik B 21 is a versatile subwoofer that can be used in a wide range of performance situations, from professional music events to high-end commercial karaoke systems, where powerful yet clean bass reproduction is required. Some typical application environments:

• Outdoor stage line-array system.
• Bar – club – lounge with strong bass DJ.
• Performance events, mobile organization.
• Large karaoke room, soundproof studio room.
• Large scale auditorium and theater sound.
• Sports center, television event organization.

Address to buy genuine SE Audiotechnik B 21 Speaker

The SE Audiotechnik B 21 speaker is a high-end passive subwoofer line from Germany, so choosing the right reputable distributor is a key factor to ensure product quality, warranty policy and after-sales technical support.

In Vietnam, Phuc Truong Audio is one of the highly appreciated units in the field of providing professional stage audio equipment, especially speaker lines from SE Audiotechnik.

When purchasing SE Audiotechnik B 21 at Phuc Truong Audio, customers will be committed to 100% genuine products, accompanied by a 12-month factory warranty policy, and receive on-site technical support for each actual space. In addition, customers can also experience the sound quality directly at the showroom, receive advice on choosing the right amplifier and support nationwide delivery and installation.

Frequently Asked Questions about SE Audiotechnik B 21 Speakers

Does the SE Audiotechnik B 21 speaker need an additional power amplifier?

Yes, because this is a 1-way passive subwoofer, it is mandatory to use a separate power amplifier to operate. According to the manufacturer's specifications, the speaker has an RMS capacity of 1000W at an impedance of 8Ω, so it should be used power amplifier capable of handling at least 1000W/8Ω, ideally a high quality Class D or Class H like Crown, CAVS, Powersoft for maximum efficiency.

What size space is the SE B 21 speaker suitable for?

With a maximum sound pressure level of up to 142dB SPL and a powerful 21-inch bass driver, the SE B 21 speaker is suitable for use in spaces of 40m² or more, especially outdoor stages, halls, large bars or performance spaces with a capacity of several hundred people. Subwoofer Not suitable for use in small rooms or regular family karaoke because it will have excess capacity and easily cause noise if not properly acoustically processed.

Can multiple speakers be paired at the same time?

Entirely possible. SE Audiotechnik Speakers The B 21 is equipped with 4 Neutrik speakON® NL4 ports, supporting convenient link-out connections. Thanks to the specially designed polarized wiring system (1+/1- for input signal, 2+/2- for link), you can connect multiple B 21 speakers in a sub-array system without having to split the signal separately from the amplifier. This is ideal for professional sound systems that need to extend the bass range.

Can SE B 21 be used for karaoke?

Yes, but should only be used for business karaoke system high-end, large singing rooms, or mini stages, where deep bass and strong force are required. For family karaoke in small rooms under 25m², B 21 will have excess power, difficult to control bass, and requires suitable matching equipment, so it is not recommended for use in normal civil environments.