4" FS Series Surface Mount, Passive, Black

Ideal Use Cases

The AtlasIED FS-4T-B is a black, passive 4-inch surface mount loudspeaker designed for high-fidelity audio in commercial environments. Its two-way, full-range configuration suits projects requiring a dedicated surface-mounted speaker with clearly documented acoustic and power specifications. The nominal 115-degree conical coverage, measured at -6dB, makes broad stated dispersion a central part of its performance profile.

This model is particularly relevant to systems built around external amplification. Its transformer taps and Low Z operating option provide multiple ways to integrate the speaker into a compatible audio design. The black finish addresses installations in which a black loudspeaker is specified, while the 10.9 x 6.88 x 8.07-inch enclosure establishes the physical space required for placement.

Why Choose This Model

The FS-4T combines IsoFlare technology with a two-way, full-range design. AtlasIED describes the speaker as delivering high-fidelity audio, and the supplied specifications provide a detailed view of its usable range. Frequency response is rated at 83Hz-22kHz within plus or minus 3dB, while the broader -10dB frequency range extends from 63Hz to 30kHz.

Its power ratings distinguish among 60W average handling, 80W programme handling, and a 240W peak rating. System sensitivity is 87dB at 1W and 1 meter. Together with its nominal coverage and maximum SPL figures, these values give system designers concrete information for matching the loudspeaker to the intended amplifier and coverage requirements.

Installation and Integration

The enclosure measures 10.9 inches high, 6.88 inches wide, and 8.07 inches deep, equivalent to 277 x 175 x 205mm. It weighs 7.72 pounds, or 3.5kg. These measurements can be used to assess the mounting location, available clearance, and the physical load associated with each loudspeaker position.

Nominal impedance is 8 ohms, and the recommended amplifier power is 120W at 8 ohms. The listed transformer taps are 30W, 15W, 7.5W, and 3.8W, with a 1.9W tap specified for 70V operation. Low Z operation is also supported. Because the FS-4T-B is passive, the amplifier and selected operating configuration form an important part of system planning.

Performance Highlights

• Frequency range: 63Hz-30kHz at -10dB, documenting the speaker’s broader frequency extension.
• Frequency response: 83Hz-22kHz within plus or minus 3dB, defining the more tightly controlled response window.
• Coverage: 115-degree conical nominal coverage at -6dB.
• Sensitivity: 87dB measured with 1W at 1 meter.
• Power handling: 60W average, 80W programme, and 240W peak.
• Maximum output: Rated maximum average SPL is 105dB. Average SPL with the maximum transformer tap is 102dB.
• Directivity: The stated directivity index is 6.1dB.

These specifications describe a speaker designed around defined coverage, full-range operation, and several power-configuration choices. They also make it possible to compare the average, programme, and peak limits separately instead of relying on a single power figure.

What Makes It Different

IsoFlare technology is the defining named audio technology of the FS-4T. It is paired with a 4-inch, two-way full-range architecture and a broad 115-degree conical coverage specification. The combination of an 8-ohm nominal impedance, multiple transformer taps, and Low Z operation gives the model a flexible documented operating profile without obscuring its amplifier requirements.

The published data also separates the standard rated maximum average SPL from the average SPL achieved with the maximum transformer tap. This distinction helps clarify performance across operating configurations. AtlasIED covers the speaker with a warranty period of 60 months from the date of purchase.

Final Assessment

The AtlasIED FS-4T-B is a precisely specified option for commercial audio systems requiring a black, passive 4-inch surface mount loudspeaker. Its main strengths are IsoFlare technology, two-way full-range operation, 115-degree conical coverage, and selectable transformer taps alongside Low Z operation. With 60W average power handling, an 8-ohm nominal impedance, and a recommended 120W amplifier rating at 8 ohms, it provides the core information needed for informed amplifier matching and system design.