Speaker Unit Details
FOSTEX FE138ES-R
13cm Full Range Limited Unit
Aluminum Die-cast Frame
This speaker unit, the "FE138ES-R", is an 13cm Full Range Limited Unit Released in January 2008 under the FOSTEX brand as a Limited-edition model, Its main specifications include an Impedance of 8ohm, a Sound Pressure Level (sensitivity) of 91.5dB/W (1m), and a rated power handling of 25W, with a maximum power capacity of up to 75W.
To provide reference values for enclosure design, the Lowest Resonance Frequency (fs, f0) is 60Hz, and the Reproduction Frequency Response range is ensured from fs to 30k Hz. Designed as a component for back-loaded horn enclosures, an Mms (m0) of 5g, and a Vas of 14L. The manufacturer-recommended enclosure type is a Turkey by Sumiyama Akira.
The frame is made of Aluminum Die-cast Frame, the required baffle hole diameter is Φ123mm, it requires 6 mounting holes, the magnet weight is 1490g, the total net weight is 2860g, the overall diameter of the unit is 154mm, and the depth is 105.2mm.
| Thiele&Small Parameters | Voice Coil Parameters | Mechanical Parameters |
|---|---|---|
fs (f0): 60 Hz Qms: 5.422 Qes: 0.28 Qts (Q0): 0.27 | Z: 8 ohm Re: 6.8 ohm Le: 0.0455 mH VC Diameter: 25 mm | Mms (m0): 5 g Cms: 0.75 mm/N Diaphragm R (a): 65 mm Bl: 6.5 Tesla/m |
| Enclosure Parameters | Other Parameters |
|---|---|
SPL: 91.5 dB/W (1m) Vas: 14 L Baffle Hole Diameter: Φ123 mm Depth: 105.2 mm Frequency Response: fs to 30k Hz Recommended Enclosure: Turkey by Sumiyama Akira | Nom.: 25 W Mus.: 75 W Overall Diameter: 154 mm Magnet Weight: 1490 g Net Weight: 2860 g Limited Edition: Yes |
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