Speaker Unit Details
FOSTEX FF85K
8cm Full Range Unit
Steel frame
This speaker unit, the "FF85K", is an 8cm Full Range Unit Released in 2000 under the FOSTEX brand as a regular model, Its main specifications include an Impedance of 8ohm, a Sound Pressure Level (sensitivity) of 88dB/W (1m), and a rated power handling of 5W, with a maximum power capacity of up to 15W.
To provide reference values for enclosure design, the Lowest Resonance Frequency (fs, f0) is 122Hz, and the Reproduction Frequency Response range is ensured from f0 to 125k Hz. , an Mms (m0) of 1.8g, and a Vas of 1.07L. The manufacturer-recommended enclosure type is a Back-loaded Horn.
The frame is made of Steel frame, the required baffle hole diameter is Φ72mm, it requires 4 mounting holes, the magnet weight is 228.3g, the total net weight is 565g, the overall diameter of the unit is 83mm, and the depth is 49mm.
| Thiele&Small Parameters | Voice Coil Parameters | Mechanical Parameters |
|---|---|---|
fs (f0): 122 Hz Qms: 5.54 Qes: 0.52 Qts (Q0): 0.47 | Z: 8 ohm Re: 7.08 ohm VC Diameter: 20 mm | Mms (m0): 1.8 g Cms: 0.001 mm/N Diaphragm R (a): 30 mm Bl: 4.33 Tesla/m |
| Enclosure Parameters | Other Parameters |
|---|---|
SPL: 88 dB/W (1m) Vas: 1.07 L Baffle Hole Diameter: Φ72 mm Depth: 49 mm Frequency Response: f0 to 125k Hz Recommended Enclosure: Back-loaded Horn | Nom.: 5 W Mus.: 15 W Overall Diameter: 83 mm Magnet Weight: 228.3 g Net Weight: 565 g Limited Edition: No |
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