Fostex FE103A-VB 100mm 8 Ohm, Alnico, Full Range driver

Since the introduction of the FE103 full-range speaker unit in 1964, the FE Series has featured ferrite magnets, with the exception of limited-edition models. The A Series employs premium Alnico magnets, which are highly regarded by audiophiles. While preserving the traditional FE sound—vibrant, bright, and transparent—it delivers richly expressive, dynamic, smooth, and pleasantly high-quality reproduction. Featuring Alnico magnets and continuing Fostex’s proud full-range tradition, the A Series presents a special regular lineup of 8 cm and 10 cm models. These models maximise the potential of Alnico magnets through cutting-edge technology.

Alnico Magnet Implementation
For the first time in the regular FE series, we’ve adopted the renowned Alnico magnet, celebrated for its expressive and pleasant sound quality. Additionally, copper caps placed on the pole pieces within the magnetic circuit reduce current distortion. This lowers distortion in the drive system, further enhancing clarity in the mid-to-high frequencies.

Double-Layer Paper Cone
The cone paper utilises a double-layer construction of ES cone, featuring fine, flexible fibres and high density. This achieves enhanced rigidity and internal damping while maintaining light weight. The base layer primarily uses long-fiber pulp, providing high rigidity and internal damping through its high-bulk structure. The surface layer incorporates short-fibre pulp, increasing the propagation speed on the cone surface.This enables reproduction of bright, taut midrange tones while delivering crisp, well-defined highs and rich, full bass.
*Two-layer paper (Patented) is our proprietary technology, a manufacturing method where a single diaphragm is formed from two layers—a base layer and a surface layer—through a two-stage paper-forming process.

Reduced midrange distortion via eyelet-less design
The weight of the eyelet added to the diaphragm caused uneven weight distribution. This induced unequal division resonance in addition to the circular vibration modes inherent to cone-shaped diaphragms, contributing to midrange distortion. Eliminating the eyelet reduces harmonic distortion in the midrange.

Pocket Neck Damper
To achieve the aforementioned eyelet-less design while enabling three-point bonding—where the voice coil, damper, and cone paper are bonded on the same circumference—the pocket neck damper method is employed.

Gold-Plated Terminals
The input terminals utilise low-loss, gold-plated Faston 205-type connectors. This ensures a reliable speaker cable connection while preventing sound quality degradation.

Specifications:

• Electrical Parameters
  • Nominal Impedance: 8.0 ohm
  • Re: 6.7 ohm
  • Le: 0.1 mH
  • fs (F0): 85 Hz
• Mechanical Parameters
  • MMS (M0): 2.66 g
  • CMS: 1.27 mm/N
  • Bl: 3.97 N/A
• Loss Factors
  • Qms: 5.82
  • Qes: 0.6
  • Qts (Q0): 0.55
• Other Parameters
  • SPL (1m/1W): 87.5 dB
  • Equivalent Diaphragm Radius (a): 40.0 mm
  • Rated Input: 5 watts
  • Overall Diameter: □107 mm
  • Voice Coil Diameter: 20 mm
  • Reproduction Frequency Response: Frequency response to 20 kHz
  • Vas: 4.55 L
  • Baffle Hole Diameter: Φ93 mm
  • Magnet Weight: 102 g
  • Weight: 600 g
  • Recommended Enclosure Method: Bass reflex
  • Accessories: Wood screws ×4, washers ×4, gasket ×1, safety precautions

PRICE (1 off)
£245.00 +vat +p&p