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This speaker unit, the "FE166En", is an 16cm Fullrange Unit Released in 2009 under the FOSTEX brand as a regular model, priced at ¥9,900+tax／1pc. Its main specifications include an Impedance of 8ohm, a Sound Pressure Level (sensitivity) of 94dB/W (1m), and a rated power handling of 22W, with a maximum power capacity of up to 65W.

To provide reference values for enclosure design, the Lowest Resonance Frequency (fs, f0) is 53Hz, and the Reproduction Frequency Response range is ensured from fs to 22k Hz. Designed as a component for back-loaded horn enclosures, an Mms (m0) of 6.8g, and a Vas of 37.02L. The manufacturer-recommended enclosure type is a Back-loaded Horn.

The frame is made of Steel frame, the required baffle hole diameter is Φ146mm, it requires 4 mounting holes, the magnet weight is 600g, the total net weight is 1600g, the overall diameter of the unit is 166mm, and the depth is 75.3mm.

The FOSTEX FE-En series is a traditional full-range regular unit by FOSTEX. It delivers bright and clear sound with a wide lineup ranging from 8cm to 20cm. The ES cone, made from perennial plants related to banana trees, features fine, flexible fibers that are well-entwined, with a broad cross-sectional shape and high aspect ratio. This results in a diaphragm with minimal loss and significantly enhanced information density. Equipped with a powerful ferrite magnet circuit, it is a versatile full-range unit suitable for both bass reflex and back-loaded horn enclosures.