Lii Audio FC15 Field Coil Speaker Driver
15 Inch High Efficiency Wideband Driver for Open Baffle and Tube Amplifiers
2120 USD per pair (power supply included)
Contact us to get a quote with shipping:
sales@liiaudiohifi.com
Less, but better.
Sound without distraction.
No crossover.
No DSP.
No unnecessary complexity.
Just a single driver moving air with coherence and intent.
The Lii Audio FC15 is a 15 inch field coil driver designed for high efficiency loudspeaker systems and low power tube amplifiers.
It delivers a coherent and continuous presentation, where tone, space and dynamics emerge naturally from a single source.
Unlike conventional multi-way systems, it preserves phase integrity and avoids the fragmentation introduced by crossovers.
The result is natural timbre, precise imaging and effortless dynamics.
Its field coil motor provides stable magnetic control, improving transient response, micro detail and dynamic expression.
The sound feels immediate, open and lifelike.
The lightweight paper cone ensures smooth midrange reproduction and natural tonal balance, particularly suited for vocals, acoustic instruments and analog recordings.
With a sensitivity of 96.7 dB, it pairs exceptionally well with single ended tube amplifiers such as 2A3, 300B or 845.
It reveals texture, presence and musical nuance without complex amplification.
Designed for open baffle, horn or transmission line enclosures, it can be used alone or combined with a woofer such as the Lii Audio W21 for extended low frequency response.
Our approach is based on simplicity, not limitation.
Rather than adding complexity through multiple drivers, DSP or heavy crossover networks, we focus on coherence, phase integrity and high efficiency.
Additional drivers can be used when necessary, but always with the goal of preserving a natural and unified presentation.
Design Philosophy:
This driver is designed for coherence, phase integrity and musical realism rather than absolute bandwidth or flat laboratory measurements.
As with all wideband drivers, bass extension and high frequency response depend on enclosure design, placement and system integration.
Learn more about field coil speakers
Features:
- 15 inch field coil driver
- High efficiency (96.7 dB)
- Field coil motor system for improved control and dynamics
- Wideband response (30 Hz – 20 kHz)
- Paper cone diaphragm for natural tonal balance
- No crossover required for full range operation
- Suitable for open baffle and horn systems
Applications:
- Open baffle speaker systems
- Horn speaker enclosures
- Tube amplifier systems (2A3, 300B, 845)
- High efficiency DIY audio systems
Measurements:
Frequency response measured at 1 meter with 2.83V input in open baffle configuration.
Performance will vary depending on enclosure design, room acoustics and system integration.
Field coil voltage and current can influence tonal balance and system tuning.
Specifications:
General:
- Type: Field Coil Full Range Speaker Driver
- Diameter: 15 inch (390 mm)
- Frequency Response: 30 Hz – 20 kHz
- Sensitivity: 96.7 dB (1W / 1m)
- Nominal Impedance: 8 Ohm
- Maximum Power: 80 W
Driver Construction:
- Cone: Paper diaphragm (natural fiber pulp)
- Surround: Fabric (DuPont)
- Basket: Aluminum
- Voice Coil Diameter: 38 mm
- Magnet System: Field Coil (external power supply included)
Thiele-Small Parameters (measured in free air):
- Fs: 28.3 Hz
- Re: 7.85 Ohm
- Qms: 3.21
- Qes: 1.12
- Qts: 0.85
- Vas: 211 L
- Bl: 5.83 T·m
- Cms: 169.5 µm/N
- Mms: 54.5 g
- Xmax: 5 mm
Physical:
- Net Weight: 7.8 kg
- Magnet Diameter: 120 mm
Compatible with Lii Audio W21 woofer for extended bass performance.
Pairs perfectly with Lii Audio AMP01 tube amplifier.
