WiiM Sub Pro black

The WiiM Sub Pro marks a decisive turning point in WiiM’s strategy, propelling the brand beyond its usual territory of streamers and network amplifiers. This first subwoofer from the brand combines a rigorous technical approach with next-generation wireless connectivity, offering a modular solution capable of radically transforming low-frequency reproduction in any home audio system.

A sophisticated acoustic design for controlled bass

The Sub Pro adopts a carefully engineered acoustic architecture centered around a 20-centimeter long-throw driver. This woofer is mounted in a downward-firing configuration, projecting sound waves toward the floor through a specially designed cavity. This cavity, open on two sides of the subwoofer, forms a horizontal slot port that acts as a sophisticated acoustic loading system.

This design approach, which some acoustic engineers refer to as a “moderate acoustic bandpass,” optimizes coupling between the driver and the listening room. The driver thus benefits from controlled acoustic loading that improves its efficiency at the lowest frequencies. The port integrated within the same cavity helps extend the response into the lower end of the spectrum, reaching the stated 25 Hz with total harmonic distortion kept under 1%.

The enclosure itself receives particularly meticulous anti-vibration treatment. Its rigid structure, designed to minimize parasitic resonances, ensures precise reproduction even at high volume levels. The piano black lacquer finish, beyond its visual elegance, contributes to the overall rigidity of the unit. With compact dimensions of 399 mm wide, 301 mm high, and 322 mm deep, the Sub Pro remains discreet despite its 16 kilograms, which attest to its robust construction.

Amplification and signal processing: power in the service of precision

The amplification stage is based on a Class D topology delivering 250 watts, more than enough power to drive the driver across its full dynamic range. This digital architecture offers several advantages in a subwoofer context: excellent energy efficiency, low heat output, and the ability to maintain performance over long listening sessions. The high sensitivity of 104 dB SPL ensures comfortable headroom, allowing the Sub Pro to track the most dynamic passages without audible compression.

The built-in signal processing is one of the Sub Pro’s key strengths. The 10-band parametric equalizer accessible via the WiiM Home app offers surgical control over the response curve. Each band can be adjusted independently in frequency, gain, and Q factor, enabling precise correction of the room’s modal behavior. Phase settings (0° or 180°) and time delay ensure perfect integration with the main speakers, eliminating cancellation or unwanted reinforcement at the crossover frequencies.

RoomFit: artificial intelligence serving home acoustics

RoomFit technology is likely the Sub Pro’s most significant innovation. This automatic calibration system uses the microphone of your smartphone or tablet to analyze the room’s acoustics. The process generates frequency sweep signals to measure the room’s impulse response, identifying resonances, nulls, and peaks of standing waves.

Once the analysis is complete, the algorithm automatically calculates the necessary corrections. These adjustments account not only for the room’s acoustic characteristics, but also the subwoofer’s placement and the preferred listening position. The system adjusts EQ, phase, and delay to deliver an optimized frequency response in the listening area. This automated approach makes accessible to everyone a calibration that previously required advanced technical knowledge and specialized measurement equipment.

RoomFit calibration runs from the WiiM device to which the Sub Pro is paired, enabling seamless integration within the ecosystem. The system also supports separate calibration of the main speakers when a subwoofer is present, ensuring optimal coherence across the entire playback system.

Hybrid connectivity: the best of both worlds

The Sub Pro offers a particularly flexible connectivity approach. In wireless mode, it leverages Wi‑Fi 6E to establish a stable, low-latency link with compatible WiiM devices. This next-generation standard, operating in the 6 GHz band, provides high bandwidth and remarkable immunity to interference. Bluetooth 5.3 with support for SBC, AAC, and LDAC codecs offers an alternative for non-WiiM sources, although Wi‑Fi remains the preferred connection for superior performance.

The mono analog RCA input enables universal integration with any amplifier or receiver featuring a standard subwoofer output. This versatility guarantees compatibility with existing systems, whether from the WiiM ecosystem or other brands. The RJ45 Ethernet port provides a wired network connection for setups where absolute stability takes precedence over wireless convenience.

A particularly smart aspect of the design lies in power management. The Sub Pro automatically detects the presence of a signal on the RCA input to wake from standby, eliminating the need for manual intervention. In the absence of signal, it automatically returns to standby after a programmable delay, thus optimizing power consumption without compromising system responsiveness.

The WiiM ecosystem: a natural fit

For users already equipped with WiiM products, the Sub Pro integrates seamlessly. It can wirelessly sync with the WiiM Mini, Pro, and Pro Plus streamers, even when these do not feature a dedicated subwoofer output. This capability greatly expands upgrade paths for existing systems. Pairing with the WiiM Amp and Amp Ultra fully leverages low-frequency management capabilities, with unified control from the WiiM Home app.

Multiroom integration is another major asset. When wirelessly connected to a WiiM device, the Sub Pro can join multiroom groups, perfectly synchronizing its playback with other zones. This feature enables sophisticated configurations where multiple Sub Pros could theoretically be deployed for optimal coverage in large rooms, although this possibility is not available at launch.

Technical specifications

Amplification and speaker

• Type: active connected subwoofer
• Amplifier: Class D – 250 W
• Driver: 20 cm (8-inch) long-throw woofer
• Sensitivity: 104 dB SPL
• Frequency response (±3 dB): 25 Hz – 200 Hz
• Frequency range: 35 Hz – 20 kHz
• Total harmonic distortion (THD+N): < 1%

Connectivity

• Wireless:
  • Wi‑Fi 6E
  • Bluetooth 5.3 (SBC, AAC, LDAC)
• Wired:
  • 1 × mono RCA input (analog)
  • RJ45 Ethernet

Advanced features

• RoomFit automatic calibration (room acoustic analysis)
• WiiM Home app: 10‑band parametric EQ settings, crossover frequency, subwoofer level, delay/latency, phase control
• Regular OTA software updates
• Compatible with the entire WiiM range and third‑party devices (via RCA)

Build and design

• Cabinet optimized against vibrations and resonances
• Clean, modern design for discreet integration

Dimensions and weight

• Dimensions: W 399 × H 301 × D 322 mm
• Weight: 16 kg

Included accessories

• RCA cable