ArtSound FL502BT SET (pack of 2)

Seven centimeters deep, a 1 mm frame, and a built-in amplifier: the FL502BT SET perfectly encapsulates Belgian manufacturer ArtSound’s approach to architectural integration. This pair of speakers — one active, one passive — turns any ceiling or partition into a complete stereo audio system, with no need for an external amplifier or complex wiring. Bluetooth 5.1 with aptX Adaptive codecs rounds out the setup for wireless streaming at near Hi-Res quality.

An active/passive system that simplifies wiring

The FL502BT SET is based on a simple but effective principle. The active speaker incorporates a 2 × 45 W Class D amplifier that powers both drivers in the kit. You only need a single mains connection, plus a standard speaker cable linking the two speakers together. This architecture eliminates the need for a dedicated amplifier in a cabinet or technical room, considerably reducing wiring inside the wall.

The 3.5 mm mini-jack auxiliary input (335 mV) allows you to connect a TV, CD player, or any home automation system that does not have Bluetooth. The speaker automatically switches to this source as soon as a signal is detected.

Bluetooth 5.1 and aptX codecs for uncompromised transmission

The FL502BT SET’s wireless connectivity is built around a Qualcomm chip compatible with aptX, aptX HD, and aptX Adaptive. The aptX HD codec transmits a 24-bit/48 kHz stream at 576 kbit/s, well above standard SBC (328 kbit/s). aptX Adaptive dynamically adjusts the bitrate between 279 and 420 kbit/s depending on radio conditions and content, maintaining a stable link even in dense Wi‑Fi environments.

This multi-codec compatibility ensures precise audio-video synchronization — often a weak point with conventional Bluetooth speakers — and listening quality that will satisfy discerning ears without the need for a wired source.

Seven centimeters thick, multiple installation possibilities

With an installation depth of just 70 mm, the FL502BT SET fits into most standard suspended ceilings and partition walls. The 180 mm circular cut-out is compatible with openings used for many recessed spotlights, making it easier to combine them in the same ceiling.

Self-locking clamps adapt to different panel thicknesses without complex adjustments. The magnetic grille snaps into place with a simple gesture and is just as easy to remove for access to settings or fine-tuning. It can be painted to match any ceiling or wall color — a valuable option in projects where visual discretion is paramount.

Construction and acoustics of the Flat range

The 2-way coaxial system pairs a 133 mm mid-bass driver with a carbon-reinforced polypropylene cone and a 13 mm polycarbonate dome tweeter. This coaxial design — with the tweeter positioned at the center of the woofer — provides even sound dispersion, particularly well suited to listening from different positions around the room.

The carbon/polypropylene composite cone offers a good balance between rigidity (for precision) and lightness (for responsiveness). The frequency response extends from 65 Hz to 20 kHz with a sensitivity of 88 dB. The bandwidth goes low enough to deliver warm vocals and solid musical foundations, without claiming to replace a subwoofer for content that is very demanding in the sub-bass region.

Residential and professional applications

The stated coverage (up to 50 m²) and easy Bluetooth connectivity make this kit suitable for many situations. In an open-plan kitchen or living room, the FL502BT SET plays music from a smartphone without a complex installation. Its rating for humid environments allows installation in a ventilated bathroom, provided it is kept away from direct water splashes.

In professional settings — medical practice, shop, meeting room, reception area — the simple Bluetooth pairing allows different users to take turns controlling the audio. Connection to an interactive display, projector, or presentation system is done via Bluetooth or the auxiliary input, depending on the available equipment.

Accessories and customization

ArtSound offers the KITRO4 acoustic kit in moisture-resistant MDF to optimize bass behavior according to the installation environment. This back box isolates the speaker from the cavity of the wall and reduces unwanted resonances. A black replacement grille (GRILLHPRO525B) is also available for interiors where standard white is not suitable.

Technical specifications

Audio system

• 2-way coaxial system
• Woofer: 133 mm carbon polypropylene
• Tweeter: 13 mm polycarbonate
• Frequency response: 65 Hz - 20 kHz

Amplification and electrical characteristics

• Power: 45 W RMS, Class D
• Sensitivity: 88 dB
• Impedance: 8 Ω

Connectivity

• Bluetooth 5.1: Qualcomm aptX, aptX HD, aptX Adaptive Audio
• Auxiliary input: 335 mV

Dimensions and installation

• Dimensions: 200 x 70 mm (Ø x depth)
• Cutout dimensions: 180 mm (Ø)
• Unit weight: 1 kg

Materials and finishes

• Composition: ABS / metal grille
• Color: white
• Customizable grille: can be painted

Available accessories

• Acoustic kit: KITRO4
• Black grille: GRILLHPRO525B

General information

• Coverage area: less than 50 m²