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Header AS-225 max

nuBoxx AS-225 max

  • The power you need: Excellent reserves thanks to 180 watts of maximum power
  • In the right place: Quickly connected to the Smart TV thanks to HDMI eARC
  • The right sound: The Dolby Digital decoder is ideal for many types of content
  • The best tools: Voice+, adaptive loudness and wide function
  • The perfect partner: As a TV base, it supports TVs weighing up to 50 kg
  • The right look: Elegant, lacquered front, harmonious shape and magnetic cover

Sounds promising

The nuBoxx AS-225 max is a soundplate, i.e. a soundbar with more volume and the possibility to place a TV with up to 50 kg on the speaker. With its stereo sound, the soundbase not only enhances the TV sound, but can also replace a compact hi-fi system. With Dolby Encoding, a sound balance and Voice+, it offers a significant upgrade to the nuBox AS-225.

nuBoxx AS-225 max mit TV

Your TV has never sounded so good

As a powerful upgrade for the TV, the nuBoxx AS-225 max provides a powerful, well-founded, lively sound for all signals that the TV transmits via HDMI-eARC - including Dolby Digital. With HDMI-eARC, you can conveniently control the volume using the TV remote control. The Voice+ function also makes all dialog clear in every situation.

nuBoxx AS-225 max Stereo

The musician

The nuBoxx AS-225 max is also suitable for acoustically clear, dynamic music reproduction in classic stereo - something you wouldn't expect from such a concept. Your favorite tracks can be played via an existing CD or network player via the digital inputs, or streamed from a smartphone via Bluetooth including aptX.

nuBoxx AS-225 max mit Subwoofer

The nuSub is already waiting

That's impressive: 36 Hz lower cut-off frequency means a lot of depth and bass. But true fans of action-packed spectacles often want even more low-frequency power. Our nuSub portfolio is ready for these users - for example with the compact nuSub XW-700.

nuBoxx AS-225 max PC-Lautsprecher

Perfect PC partner

A nuBoxx AS-225 max can also be used on a PC as a platform for the screen and at the same time significantly improve the acoustics. You can use the optical or coaxial input to bring lossless digital game audio tracks and music to the soundbar. Alternatively, the signal can be fed in analog via the RCA inputs.


Fernbedienung nuBoxx AS-225 max und AS-425 max

Remote control

The supplied remote control with metal surface is ergonomically shaped, clearly arranged and of high quality. It offers quick access to the inputs, volume, DSP modes, sound control and a Bluetooth pairing button to connect the smartphone.

Wide function and loudness

We have integrated adaptive loudness - bass is reproduced with full volume even at low volumes. The nuBoxx AS-225 max also boasts a wide function, which presents the sound of the soundbar with an extended stage. Your advantage: maximum sound with a small footprint.


Voice+ and tone control

Thanks to our Voice+ function, dialog that is difficult to understand is a thing of the past. You can also adjust the bass range as well as the mids and treble - so everything always sounds just the way you want it.

With Dolby Digital decoder

Many films on Blu-ray or DVD as well as content from numerous streaming services usually come with a Dolby Digital track. By integrating the appropriate decoder, we can realize optimal sound from the data stream. Together with the other high-quality features of the nuBoxx AS-225 max, this results in a realistic, captivating sound image.

Dolby Audio


With our black and white color options, you have the choice: a modern two-tone look or a classic solid color in your living room. The body is covered with a robust and easy-to-clean foil surface, the front has an elaborate lacquer finish. The color-coordinated fabric cover gives the nuBoxx soundplate an elegant appearance.


The simple design makes the nuBoxx models timelessly elegant components in the tradition of the classic Bauhaus style. The simple attachment of the cover using magnets also follows this school, so that your speaker is optimally protected and the appearance is flawless at the same time. The acoustically permeable fabric also ensures unadulterated sound.

Series overview

Our nuBoxx active series has integrated power amplifiers, with which the speakers are immediately "Ready to Use". We develop them in the tradition of our company: the best possible detail for music. This results in the best sound for movies, games and TV shows. For more low end, we have the nuSub-Series subwoofers in the range, which provide even more bass.

Nubert Hörraum nuBoxx

Committed to honest sound

We are a German company that has been developing and selling speakers directly for over 45 years. We stand for neutral reproduction so that you receive exactly the same signal that is present on the source. We add nothing and leave nothing out. We promise! You can find more information about our philosophy here.

Nubert Gebäude

Quality management

All nuBoxx models are thoroughly tested by us in Schwäbisch Gmünd to ensure that you receive a perfect product. We check the appearance, technology and sound for the best results for you.

Zweite Wahl

This product as 2nd choice

In some installation locations - for example with rearspeakers behind a curtain - the visual appearance plays a subordinate role, but the function must be guaranteed without restriction. Here, our 2nd choice is the ideal solution for price-conscious customers. These are exhibition items, customer returns or discontinued models with minor signs of use, but which have been technically inspected by our service department. We also give a full 2-year guarantee on the 2nd choice.

nuReality App

nuReality - AR App

Bring the high end into your home in advance with our augmented reality app. Our 360° view or our AR mode provide the final details for your favourite speakers in your own four walls.

Google Play

Apple Store

Nubert Hörraum nuBoxx

Committed to honest sound

We are a German company that has been developing loudspeakers and selling them directly for over 45 years. We stand for neutral reproduction, so that you receive exactly the signal that is present on the source. We add nothing and leave nothing out. That's a promise! You can find more information about our philosophy here.

Nubert Gebäude

German engineering expertise

Perfected by our developers at the Schwäbisch Gmünd site: Our nuBoxx series offers affordable access to the world of hi-fi sound - and already at a very high level. Every nuBoxx speaker fascinates with an amazingly full-bodied and broadband sound that leaves nothing to be desired.

nuReality App

nuReality - AR App

Bring High End into your home in advance with our Augmented Reality App. Our 360° view or our AR mode offer final details for your desired loudspeakers in your own four walls.

Google Play

Apple Store

Listen to it now in our stores!

Test results

We are awarded. And proud of it.

Clevere Technik - voller Sound

Kompakte Soundbar-Subwoofer-Kombi nahe am perfekten Sounderlebnis

HiFi goes Mainstream

nuBoxx AS-225 max: HiFi-Sound für kleines Geld

Gerät des Jahres 2022

nuBoxx AS-225 max ausgezeichnet

Guter Klang für wenig Geld

nuBoxx AS-225 max Testsieger Stiftung Warentest bei den einteiligen Soundplates in der Preisklasse bis 500 Euro

Besser als jeder Fernseher

nuBoxx AS-225 max – kompakte Heimkino-Soundbar mit modernen HiFi-Qualitäten

Gut abgespeckt

Die nuBoxx AS-225 max klingt klasse, hat effektive DSP-Funktionen und ist sehr gut verarbeitet.

Praktische TV-Soundlösung

TV-Lautsprecher mit kabellosem Musikstreaming und Raumklang

Erstklassige Hörerlebnisse aus nur einer Box?

nuBoxx AS-225 max im Test

Nahezu optimaler HiFi-/TV-Lautsprecher

nuBoxx AS-225 max: Kräftiges Fundament, sehr gute räumliche Weite, eine tadellose Einarbeitung von Stimmen


We not only build exceptional loudspeakers and electronics, but also offer the matching accessories. So you can find everything useful for our products, from cables to adapters.

in-akustik Premium MP3 Audio Cable
Premium jack to stereo cable
€24.99 / Piece

in-akustik Star 2.1 HDMI
HDMI cable
€18.49 / Piece

nuCable Digital Pro
High End Coaxial Cable
€23.00 / Piece

Content: 1,5 Meter (€15.33 / 1 Meter)

Staywired Pro Flex
Organisational talent
€12.50 / Piece

Content: 0,5 Meter (€25.00 / 1 Meter)

Wall shelf WA-4
Wall shelf
€89.00 / Piece

Not the right one? We recommend taking a look at related products that you might like.

Bluesound NODE
Network Player
€549.00 / Piece

Cambridge Audio AXC35
€429.00 / Piece

Denon DCD-600NE
€329.00 / Piece

nuSub XW-700
Tiny low end power
€495.00 / Piece

nuSub XW-800 slim
Slim desing low end
€585.00 / Piece

nuSub XW-900
Low end for enveryone
€695.00 / Piece


Questions about soundbars

It usually helps to check the TV manual and look for the keywords "HDMI CEC" and "HDMI ARC". Often there are only small settings to be made in the TV menu, such as selecting the external audio system for sound output. We are also happy to help on the phone.

We give a 2-year warranty on soundbar speakers. You can find exact details of our conditions here. However, we also offer a warranty extension to a total of 5 years, you can find all the info here.

In most cases, the error can be solved by selecting the right source on the TV or by increasing the volume. We will be happy to help you via telephone +49 7171 87 12 0, WhatsApp or E-Mail according to the motto "Doesn't sound, doesn't exist". Because for us, good service is part of the product.


4 of 8 reviews

4.88 / 5


Honest speakers - Honest reviews

Satisfied? Or can we do something better with our products? Then write us your review. Simply log in to your account and write the review of your order here.

Here with us, every review is checked for authenticity and is then approved. So you can be sure that the feedback you give us about our products is genuine.


5 May 2024

Eine Soundbar die hält was sie verspricht !


30 April 2024

Klasse Soundbar typisch Nubert


30 March 2024

Erwartung mehr als erfüllt


24 January 2024

Tolles Teil

Technical information

Subject to technical changes.

Box type, sound and recommended use

Modern flat-screen TVs draw high-contrast, colorful pictures with ultra-high resolution and buttery-smooth movements. However, the thin housings offer too little space for potent speaker drivers, which is why the sound usually cannot keep up with the display quality. Nubert soundbars provide a remedy: The nuBoxx AS-225 max is the compact sound upgrade for your TV.

The nuBoxx AS-225 max upgrades the acoustics in your living room in no time, provides more TV fun and - thanks to the integrated Bluetooth receiver - music enjoyment in great quality. Setup and connection are done in a few minutes: With many TV models, the flat soundbase can be placed directly under the stand, where it also functions as an attractive pedestal. But the soundplate also cuts a great figure in a lowboard compartment or simply in front of the TV, especially since its clean, angular lines and black or white finish perfectly match many interior styles and furniture.

The easiest way to connect the nuBoxx AS-225 max to your TV is via HDMI cable. The soundbar is connected to an ARC or, even better, eARC-capable input, which also transmits control commands in addition to the sound signals. For example, the volume of the sound system can be adjusted with the TV remote control.

Despite the compact dimensions and attractive price point, the nuBoxx AS-225 max appears amazingly grown-up: with room-filling voice, powerful bass and authentic effect reproduction. For movies and TV shows, you won't want to miss the virtual stage extension (wide effect) and speech enhancement (Voice+). The former provides a wider, more vivid sound panorama that immerses viewers directly in the action. Voice+, on the other hand, puts the spoken word more in the acoustic focus and guarantees clear comments and better understandable dialogs. Thanks to the integrated Dolby decoder, the Soundplate optimally prepares movies and series streams in every situation.

Because the nuBoxx AS-225 max carries true "hi-fi genes" and relies on the same proven driver and amplifier technology as Nubert's compact active speakers, it shines not only with movie and TV sound, but also with music playback. Using a cell phone or tablet as a wireless Bluetooth player, you can easily enjoy your favorite songs, listen to radio streams or podcasts. Acoustically, the nuBoxx AS-225 max can easily compete with a compact stereo system and even has advanced sound settings for bass and mids/treble as well as a loudness function for powerful low-frequency reproduction at low volumes.

Thus, the nuBoxx AS-225 max is ideal for anyone looking for a compact and affordable, but high-quality sound upgrade for the TV at home.

Design principle and housing

As a fully active two-way soundbar, the nuBoxx AS-225 max uses an active crossover and a total of four powerful digital amplifiers with 45 watts of music power each, one for each of the four loudspeaker chassis and frequency paths. The digital operating principle enables precise separation and equalization of the frequency ranges, which accounts for the good low-frequency performance of the comparatively compact soundbar.

The speaker cabinet is made of 19 millimeter thick medium-density fiberboard (MDF), which reliably reduces resonances and promotes a clean sound image. Thanks to the stable construction, the nuBoxx AS-225 max supports TV sets weighing up to 40 kilograms. The two bass reflex ports are located on the back of the system.

The cabinet body is equipped with a high-quality decorative foil in white or black, the baffle is satin lacquered. The removable, magnetically adhering front cover is covered with optimally permeable acoustic fabric.


The nuBoxx AS-225 max uses two 118-millimeter woofers and two 25-millimeter tweeters, both of which were specially developed for the nuBoxx A series speakers and have impressive performance values for their size class. For example, the soundboard owes its impressive lower cutoff frequency of 36 Hertz (at -3 decibels) to both the precise DSP control and the tuned long-throw woofers. The textile dome tweeters are characterized by excellent omnidirectional sound distribution and particularly fine resolution.

Operation and setting options

When connected to an ARC- or eARC-enabled HDMI port, basic functions such as volume and standby can also be accessed via the TV. The included remote control, which is characterized by its high-quality feel and elegant design, allows quick access to the various sound settings of the soundbase.

Multicolored LEDs around the rotary knob provide clear information about the selected input and the device's status, and are also easy to see through the removable fabric cover.

Tone control

The nuBoxx AS-225 max is neutrally tuned and outputs true-to-original two-channel sound at the factory. In addition, during the sound tuning, emphasis was placed on the best possible speech intelligibility and a wide sweet spot. If an even more effective reproduction is desired, pressing the Wide button on the remote control activates a special DSP circuit, which increases the spatiality of the reproduction and makes the sound events seem more three-dimensional - ideal for movies and TV shows. The effect expands the acoustic stage and immerses the listener even deeper into the sound experience. We call this "listening zone expansion".

The "Voice+" function, which emphasizes the center channel and the frequencies relevant for voice reproduction, proves particularly useful for movies and TV shows. This increases speech intelligibility in suboptimally mixed broadcasts and during quiet playback.


The soundbar features five audio inputs and one output. There is an optical digital and an electrical digital connection, an HDMI-eARC port, an analog stereo RCA connection and a Bluetooth receiver for wireless connections. Thus, users enjoy almost free choice when it comes to the feed player: Almost all modern media systems can be connected, from classic CD players to multimedia computers, game consoles and TVs, and even mobile multi-talents such as smartphones or tablets.

A sub output is available for connecting an external subwoofer. If this is used, the lower cut-off frequency of the nuBoxx AS-225 max is raised to 80 Hertz, which increases the level reserves.


The nuBoxx AS-225 max is equipped with a convenient automatic energy-saving feature, which switches the speakers on independently or puts them into power-saving standby mode when not in use. In this stand-by mode, which can also be activated manually via the remote control, the speakers consume less than 0.5 watts. The wide-range power supply allows this soundbar to be used on mains voltages from 110/120 to 230/240 volts.

More info in technology

For all technically interested music and home cinema lovers who are not put off by hard facts and metrological details, Günther Nubert's "Technik satt" offers plenty of technical correlations and electro-acoustic background knowledge as well as the topic of sound optimization and insights into the development and history of Nubert loudspeakers and devices.