FBT Install Libra 8S B

The Libra Series: An "Installation" Approach by FBT

With the FBT Install range, the Libra series targets sound reinforcement designed for integration: controlled footprint, connectors suited for installations, and robust construction. The LIBRA 8S Black fits this logic by offering a compact bass reinforcement intended to complement an installed system when seeking more foundation and listening comfort without resorting to bulky subwoofers.

Intended Uses and Users

The FBT Install LIBRA 8S Black is aimed at integrators, installers, and operators of public venues who want to densify the low end for background music, more rhythmic playlists, or microphone playback, while maintaining a discreet footprint. Its omnidirectional dispersion makes it a coherent choice whenever a homogeneous bass is desired in the listening area, with flexible placement options (depending on room configuration and cabling constraints).

Practically, this subwoofer is suitable for spaces prioritizing clean and clear bass rather than extreme sub-bass: retail stores, hotels, restaurants, bars, meeting rooms, small multipurpose rooms, or reception areas. Thanks to its size, it can be easily positioned within existing layouts while providing noticeable reinforcement between 42 Hz and 300 Hz.

Design, Performance, and Implementation Recommendations

A Passive Subwoofer to Integrate into an Amplified Chain

The LIBRA 8S Black is a passive subwoofer : it requires an external amplifier, with a recommended amplifier power of 300 W rms. Its nominal impedance of 8 ohms facilitates integration into many amplification configurations intended for installations. In terms of level, it offers a sensitivity of 89 dB, a continuous max SPL of 114 dB, and a peak max SPL of 117 dB, values consistent with an 8-inch format designed for integration.

8-Inch Driver and Bass-Dedicated Useful Range

The cabinet is equipped with an 8-inch (203 mm) driver featuring a 1.5-inch (38 mm) voice coil. Its frequency response from 42 Hz to 300 Hz supports the rhythmic foundation and relieves the main speakers from the most demanding frequencies. The result: often cleaner sound, better level handling at equivalent power, and a heightened sense of dynamics, particularly appreciated in installed systems.

Recommended Filtering: A Solid Basis to Protect and Optimize

FBT recommends a high-pass filter at 38 Hz with a slope of 24 dB per octave. This approach aims to limit unnecessary energy below the operating range, protect the transducer, and stabilize the cabinet's behavior in reverberant rooms or environments where high levels are pushed. An external filter is also recommended, with a dedicated DSP processor to adjust filtering, equalization, and level according to the venue and the rest of the system.

Installation Connectors and Robust Enclosure

For clean integration, the LIBRA 8S Black features an input and link output via Euroblock connectors. Its enclosure, made of Baltic birch plywood, is designed for rigidity and durability, and the black finish facilitates discreet installation. A suspension kit is included, opening mounting possibilities according to project constraints.

Technical specifications

Bluetooth

No

Type	passive subwoofer	Nominal impedance	8 ohms
Series	Libra (FBT Install)	Power handling	150 W
Manufacturing	Italy	Power handling (IEC 268-5)	600 W
Color	black	Recommended amplifier power	300 W rms
Frequency response	42 Hz - 300 Hz	Recommended high-pass filter	38 Hz - 24 dB per octave
Dispersion (HxV)	omnidirectional	Recommended external filter	FBT DSP Processor
Sensitivity	89 dB	Input	Euroblock
Max continuous SPL	114 dB	Link output	Euroblock
Max peak SPL	117 dB	Enclosure material	Baltic birch plywood
Driver size	8 inches (203 mm)	Dimensions	326 x 275 mm
Voice coil	1.5 inches (38 mm)	Weight	6.1 kg