Fast 15

453 US $ per pair

Contact us to get a quote with shipping at contact@liiaudiohifi.com

Effortless Scale, Full-Range Simplicity

The FAST-15 is Lii Audio’s large-format 15-inch full-range driver designed for those who crave big, room-filling sound without sacrificing clarity, tone, or immediacy. With a generous 95.7 dB sensitivity and wide frequency response from 45.5 Hz to 15 kHz, this driver brings scale, speed, and richness—ideal for high-efficiency speaker designs or minimalist wide-baffle systems.

Built around a Ceramic Y35 magnet, lightweight paper cone, and a precision-wound 38 mm voice coil, the FAST-15 handles dynamics with ease while retaining the coherent, single-source character full-range drivers are known for. Perfectly suited for open-baffle, reflex, or horn-loaded cabinets, this driver delivers low-end authority and articulate mids with a natural, extended high-end presence.

Key Features

15" full-range driver — wide bandwidth from a single source
High sensitivity (95.7 dB) — compatible with low-wattage amps
Natural tonality with smooth, extended response up to 15 kHz
Ceramic Y35 magnet for control and resolution
No crossover required — direct, phase-coherent sound
Ideal for large open-baffle, back-loaded horn, or FAST systems

Technical Specifications

Resonant Frequency (Fs)
45.5 Hz

Frequency Response
45.5 Hz – 15,000 Hz

Vas
351.738 L

Re (DC Resistance)
7.8 Ohms

Sensitivity(SPL)
95.7 dB (1W / 1m)

Qms
3.479

Qes
1.381

Qts
0.989

Sd (Cone Area)
881 cm²

Cms (Compliance)
319.138 µM/N

Mms (Moving Mass)
38.341 g

Mmd (Diaphragm Mass)
23.305 g

Le (Voice Coil Diameter)
38 mm

Nominal Impedance
8 Ohms

Max Power
80 W

Xmax
5 mm

Bl (Force Factor)
6.519 T·m

Magnet Diameter / Material
135 mm / Ceramic Y35

Nominal Diameter
390 mm (15")

Installation Notes

Designed for full-range systems — no crossover needed
Best results in large enclosures, such as open baffle, TL, or reflex
Delivers coherent, musical sound with excellent scale
Sold as a matched pair for stereo setups