Focal Pro Sub One – Active Professional Studio Subwoofer
The Focal Pro Sub One is an active professional studio subwoofer designed to extend the low-frequency performance of nearfield monitoring systems while providing comprehensive bass-management facilities. It combines two 8-inch Slatefiber woofers with 200W RMS of Class-D amplification in a slim, front-ported enclosure. With a frequency response of 32Hz–120Hz, maximum SPL of 114dB and balanced Left, Right and LFE connectivity, Sub One is particularly suited to professional recording, mixing, mastering and production environments, including systems built around Focal Alpha Evo and Shape monitors.
Key Features
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Professional Active Subwoofer: Designed to extend the low-frequency response of professional studio monitoring systems.
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Dual 8" Slatefiber Woofers: Two long-excursion Slatefiber drivers provide controlled, neutral and dynamic bass reproduction with low distortion.
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200W RMS Amplification: Integrated Class-D amplification provides the power required to drive the dual-woofer configuration.
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32Hz – 120Hz Frequency Response: Extends monitoring into deep bass frequencies for more accurate evaluation of low-frequency content.
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114dB Maximum SPL: High peak output capability supports demanding professional monitoring applications.
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Balanced Left & Right Inputs: Provides professional stereo connectivity for integration between an audio source and studio monitors.
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Balanced Left & Right Outputs: Allows the connected stereo signal to be routed onward to compatible active monitors.
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Dedicated LFE Connectivity: LFE input and output support professional low-frequency-effects monitoring configurations.
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Variable Low-Pass Filter: Allows the subwoofer crossover frequency to be adjusted for integration with the main monitors.
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High-Pass Monitor Output: Bass management can remove low frequencies from the signal sent to the main monitors.
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High-Pass Defeat: Allows the monitor high-pass filtering to be bypassed when required.
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Adjustable Subwoofer Level: Provides sensitivity adjustment for matching the subwoofer output with the main monitoring system.
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Phase Adjustment: Variable phase control helps optimise acoustic alignment between the subwoofer and monitors.
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Polarity Switch: Provides additional control over low-frequency integration within the listening environment.
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2.1 Bypass: Bass management can be bypassed using a compatible external footswitch for rapid comparison.
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Mute Function: Allows the subwoofer output to be muted when required.
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Slim Cabinet: Space-efficient design makes the Sub One easier to position along a wall or underneath a studio desk.
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Front-Firing Ports: Front-mounted vents provide greater flexibility when positioning the subwoofer close to room boundaries.
Acoustic Specifications
| Product Type |
Active Professional Studio Subwoofer |
| Configuration |
Dual-Woofer Active Subwoofer |
| Woofer Configuration |
2 × 8" (20cm) Slatefiber |
| Woofer Technology |
Focal Slatefiber |
| Frequency Response |
32Hz – 120Hz (±3dB) |
| Maximum SPL |
114dB Peak @ 1m |
| Enclosure |
Bass Reflex |
| Port Configuration |
Front-Firing |
Amplification
| Amplifier Type |
Class-D |
| Amplification |
2 × 100W |
| Total Amplifier Power |
200W RMS |
| Built-in Amplifier |
Yes |
| External Power Amplifier Required |
No |
| Active Subwoofer |
Yes |
Dual Slatefiber Woofers
| Number of Woofers |
2 |
| Woofer Diameter |
8" / 20cm Each |
| Cone Technology |
Slatefiber |
| Cone Construction |
Recycled Carbon Fibres & Thermoplastic Polymer |
| Driver Design |
Long Excursion |
| Design Characteristics |
High Rigidity / Controlled Damping / Low Mass |
| Primary Function |
Low-Frequency Reproduction |
| Low-Frequency Extension |
32Hz |
Audio Inputs
| Left Input |
Yes – Balanced XLR |
| Right Input |
Yes – Balanced XLR |
| LFE Input |
Yes – Balanced XLR |
| Input Type |
Balanced XLR |
| Input Impedance |
10kΩ |
| Stereo Input |
Yes |
| Dedicated LFE Input |
Yes |
| RCA Input |
No |
| TRS Input |
No |
| Digital Input |
No |
Audio Outputs
| Left Monitor Output |
Yes – Balanced XLR |
| Right Monitor Output |
Yes – Balanced XLR |
| LFE Output |
Yes |
| Stereo Monitor Outputs |
Yes |
| High-Pass Filtered Output |
Supported |
| High-Pass Defeat |
Yes |
| LFE Signal Routing |
Supported |
Bass Management
| Integrated Bass Management |
Yes |
| Low-Pass Filter |
Yes – Adjustable |
| High-Pass Filter |
Yes |
| High-Pass Filter Application |
Left / Right Monitor Outputs |
| High-Pass Frequency Selection |
Yes |
| High-Pass Defeat |
Yes |
| Subwoofer Level |
Adjustable |
| Phase |
Adjustable |
| Polarity |
Switchable |
| Mute |
Yes |
| 2.1 Bypass |
Yes |
| External Footswitch Control |
Supported for 2.1 Bypass |
Controls
| Subwoofer Level / Sensitivity |
Adjustable |
| Low-Pass Frequency |
Adjustable |
| Phase Adjustment |
Variable |
| Polarity Control |
Switchable |
| High-Pass Frequency Selection |
Yes |
| High-Pass Defeat |
Yes |
| Mute |
Yes |
| 2.1 Bypass |
Yes – External Footswitch Controlled |
| Power Switch |
Rear Panel |
Status Indicators
| Power Indicator |
Yes |
| Mute Indicator |
Yes |
| High-Pass Defeat Indicator |
Yes |
Studio Integration
| Stereo 2.1 Monitoring |
Yes |
| LFE Monitoring |
Yes |
| Bass Management |
Integrated |
| Monitor High-Pass Filtering |
Yes |
| Bypass Comparison |
Yes – Via External Footswitch |
| Recommended Focal Range |
Alpha Evo / Shape |
| Audio Interface Integration |
Yes – Via Balanced Analogue Connections |
| Monitor Controller Integration |
Yes – Via Balanced Analogue Connections |
Recommended Applications
| Professional Recording |
Yes |
| Mixing |
Yes |
| Mastering |
Yes |
| Music Production |
Yes |
| Broadcast / Post Production |
Yes |
| Nearfield Monitoring Systems |
Yes |
| 2.1 Monitoring |
Yes |
| Low-Frequency Evaluation |
Yes |
Cabinet & Design
| Cabinet Profile |
Slim / Space-Saving |
| Enclosure Type |
Bass Reflex |
| Port Location |
Front |
| Woofer Configuration |
Dual 8" Slatefiber |
| Under-Desk Placement |
Suitable |
| Near-Wall Placement |
Designed for Flexible Integration |
| Professional Studio Installation |
Yes |
| Finish |
Black |
Power Specifications
| Power Supply |
100–240V AC |
| Fuse |
T2AL / 250V |
| Amplifier Technology |
Class-D |
| Total Rated Power |
200W RMS |
| Power On / Off |
Rear-Panel Switch |
Dimensions & Weight
| Width |
310mm / 12.2" |
| Height |
475mm / 18.7" |
| Depth |
520mm / 20.5" |
| Dimensions (W × H × D) |
310 × 475 × 520mm |
| Weight |
18.5kg / 40.8lb |
| Quantity |
Single Subwoofer |
General Specifications
| Brand |
Focal Pro |
| Model |
Sub One |
| Product Category |
Professional Active Studio Subwoofer |
| Woofer Configuration |
2 × 8" Slatefiber |
| Amplification |
200W RMS Class-D |
| Frequency Response |
32Hz – 120Hz (±3dB) |
| Maximum SPL |
114dB Peak @ 1m |
| Inputs |
Balanced Left / Right / LFE |
| Outputs |
Left / Right Monitor Outputs + LFE Output |
| Bass Management |
Integrated |
| Low-Pass Filter |
Adjustable |
| High-Pass Filter |
Selectable / Defeatable |
| Phase |
Adjustable |
| Polarity |
Switchable |
| 2.1 Bypass |
Yes – External Footswitch Control |
| Dimensions |
310 × 475 × 520mm |
| Weight |
18.5kg |
| Quantity |
Single Unit |
System Integration
The Focal Pro Sub One is designed to integrate between a professional audio interface, monitor controller or other balanced source and a pair of active studio monitors. Left and right balanced signals can enter the Sub One and then pass to the main monitors through its outputs, allowing the integrated bass-management system to divide low-frequency reproduction between the subwoofer and monitors. A dedicated LFE path is also provided for compatible monitoring configurations. Adjustable subwoofer level, low-pass frequency, phase, polarity and selectable high-pass filtering allow the system to be calibrated for the monitoring environment. The 2.1 bypass function can be controlled by an external footswitch, allowing rapid comparison between full-range stereo monitoring and subwoofer-assisted playback.
