nuSub XW-700

Box type, sound and recommended use

Even the more compact of the two nuSub woofers, with its 20-centimeter chassis, achieves a lower cutoff frequency of 26 Hertz at minus three decibels and can thus, for example, even extend the bass response of a nuPro XS-6000 RC. Above all, however, it is ideal for space-saving sub/sat combinations with compact satellites, be it passive models such as a nuLine 34 or active speakers like the nuPro XS-3000. Thanks to its manageable dimensions and downfire design, it also fits discreetly into smaller living rooms. However, 250 watts of music power ensure inspiring low-frequency pressure even in spacious listening environments.

Even more bass is achieved by adding a second XW-700 or even more subwoofers. Cable clutter is not to be feared, because the active bassists of the new XW series can be optionally supplied wirelessly! The source is either an amplifier or active loudspeaker from our X generation (nuConnect ampX, nuPro X or nuPro XS) or the nuConnect trX, a special radio transmitter that can also be used to make older AV receivers or stereo amplifiers with sub-out fit for the wireless age. The wireless control makes the operation of XW subwoofers as convenient as simple - even with multiple copies! But of course, the connection can also be made to the AV receiver or amplifier via a conventional Y-cable.

There are also several options for operation. Settings such as crossover frequency or level can be easily made via the rotary control on the back of the subwoofer. Pressing the knob switches between the two functions, and the currently selected value is indicated by correspondingly colored LEDs. The control is even easier and graphically clearly presented with the help of our free app Nubert X-Remote for iOS and Android. With the help of the program's calibration function, the subwoofer can even be ideally adjusted to the room acoustics. Droning effects or "bass holes" are reliably reduced. You can find out more about the mobile app in the box below.

This unit can be paired with other X-Platform products via Nubert's X-Connect and X-Connect Surround wireless standards.

Both standards transmit sound data in high resolution, securely and with minimal latency. X-Connect transmits 2 channels at 192 kHz and 24 bits for maximum performance in stereo operation. X-Connect Surround, on the other hand, transmits up to 8 channels at 48 kHz and 24 bits for simple and elegant integration in multi-channel systems.

The speakers of the nuPro X and XS series and the ampX amplifier transmit in the X-Connect standard, as does the nuConnect trX adapter. This can also be used to integrate hi-fi and home theater products from other manufacturers into the wireless network. The soundbase nuPro XS-8500 RC and the AV preamplifier nuXinema preAV transmit in the X-Connect Surround standard.

The models in our nuSub series can therefore be used to effortlessly expand stereo satellite speakers as well as soundboards and home theater systems.

Design principle and housing

The nuSub XW-700 is designed as an active bass reflex subwoofer in the so-called downfire design. This means that the drivers and bass reflex tube radiate downwards. Solid feet with height-adjustable spikes ensure distance and a horizontal stand. The special acoustic challenges of this design are mastered, among other things, by the clever use of a digital signal processor - more about this in the section "Control, App and Room Measurement" below.

Einer der Vorteile des Downfire-Konstruktionsprinzips ist das dezente Design. Als ebenmäßiger Quader mit sanft gerundeten Kanten fügt sich der XW-700 elegant in praktisch jeden Einrichtungsstil ein. Die Anschlüsse und Bedienelemente wurden dezent auf der Rückseite platziert. Das Gehäuse besteht aus robustem und akustisch vorteilhaftem Holzfasermaterial (MDF) und ist mit einem hochwertigen Lack in seidenmattem Finish versehen.

Chassis

The nuSub XW-700 relies on a 20-centimeter chassis with extra-long excursion, which has been optimized specifically for the requirements of this subwoofer and the downfire design. The wide, flexible surround allows for particularly wide diaphragm excursions. The generously dimensioned drive exhibits high efficiency and can generate high sound pressures with the lowest possible distortion. Additional equalization is provided by the integrated signal processor, which optimally controls the chassis in every reproduction situation.

Amplifier module

The power amplifier of the nuSub woofers is based on the proven digital amplifiers of the nuPro series and features the same high-quality signal processing and impressive efficiency. With 180 watts nominal or 250 watts music power and highest impulse fidelity, the nuSub XW-700 gives impressive bass performances in larger listening rooms. All settings are managed by the built-in Digital Signal Processor (DSP).

Optional wireless operation

The subwoofers in the nuSub series have a line input that allows them to be connected to standard receivers and amplifiers with a sub output using a Y-cable. Alternatively, each subwoofer can also receive sound signals wirelessly. Either our amplifiers nuConnect ampX and nuXinema preAV or a master speaker from the nuPro X and XS series (for example a nuPro XS-4000 or also the soundbar nuPro XS-8500) are recommended as sending stations. With the nuConnect trx, we also offer a transmitter module that can be used to make conventional receivers fit for the wireless age. The radio range is typically around 15 meters. The possibilities are endless!

Control, app and room calibration

As an alternative to the knob on the subwoofer, the free Nubert X-Remote app for iOS and Android can also be used. The use of the app is particularly recommended for complex operating procedures, as it presents advanced functions such as the definition of the crossover frequency in a particularly clear manner. The program automatically adapts the menu interface to the equipment of the respective connected device. A speaker from the nuPro X series offers different functions than, for example, the integrated amplifier nuConnect ampX.

The app's advanced features include bass equalization, which enables optimal low-frequency reproduction at the listening position and reliably minimizes dreaded room modes. The application is very easy to use: Start the app, connect to the nuSub and navigate to the X-Room Calibration entry via the main menu in the upper left corner. Now follow the instructions of the app to start the calibration. To do this, simply play and record the test signal (white noise) for a few seconds; the process is largely automatic. The smartphone or tablet then calculates the best possible tuning curve from the played back test signal and then transmits this to the subwoofer's Digital Signal Processor (DSP), where the calibration is permanently stored. The calibration can be stored in one of the preset locations so that a comparison between activated optimization and unchanged playback is possible at any time. The X-Room Calibration function can be used in parallel with the other sound settings.

Attention: For technical reasons, the calibration only works with current iOS devices using on-board tools. Android smartphones and tablets do not provide reliable measurement results due to the large number of microphones used with different parameters. The solution is the optional Nubert XRC Android Interface: a compact plug-in module that connects to the USB input (type C) of the mobile device and gives the X-Remote app access to a precise measurement microphone and a sophisticated analog-to-digital converter. This handy USB dongle can be used to accurately capture the XRC system's measurement tone or room response, and then the app can calculate the optimal correction curve and transmit it to the signal processor. More information about the application can be found in the manual.

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.