21NFR

Introducing the 21NFR - a small driver with a mighty punch! This gem was developed to deliver a full range of frequencies, from rich bass to crystal-clear highs, making it the perfect choice for portable products, bookshelf speakers, and array applications in columns.

What sets the 21NFR apart is its full-range behavior, eliminating the need for additional tweeters while still achieving excellent sound quality. Our extensive experience in designing highly efficient transducers shines through in this driver, offering top-notch performance without breaking the bank.

The u-cup style magnetic system is optimized to deliver consistent magnetic flux to the voice coil across the entire operational range, ensuring a powerful and consistent audio experience. Plus, with a lightweight yet robust cone attached to our specially crafted rubber blend surround, the 21NFR is designed to handle low frequencies with ease while also excelling as a high-frequency device.

Get ready to experience the power and versatility of the 21NFR - where small size meets massive performance.

The 21NFRX16-393D is a 2-inch full-range driver designed for embedded consumer and professional audio applications requiring a 16ohm impedance - primarily vertical column speaker arrays, flat-panel TV sets, soundbars, and compact portable products. It features a carbon fiber reinforced paper cone driven by a 20.3mm CCAW voice coil on a Kapton former, a neodymium U-cup magnetic circuit, and an NBR rubber surround engineered for durability in outdoor and long-term installations. Sensitivity is 85.76 dB (1W/1m) / 84.7 dB (2.83V/1m), with a Bl of 4.4 T.m, supporting 10W AES / 20W continuous power handling. The 16ohm nominal impedance offers 6 dB higher sensitivity per watt than the 4ohm companion 20NFRX4-345A and enables flexible parallel wiring in column arrays (4x 16ohm in parallel = 4ohm). Qts = 0.68 reflects a compliant suspension design suited to free-air and open-back installations, where the driver's natural motor damping produces the best available low-frequency extension.

- Free air / open-back - f-3dB approx. 164 Hz - preferred for column arrays and open-back designs
- 215 mL sealed (Qtc=1.00, f-3dB 182 Hz) - largest practical sealed alignment for portable use
- 118 mL sealed (Qtc=1.20, f-3dB 204 Hz) - compact rear cavity for soundbar or column enclosures
- <=50 mL sealed (Qtc>=1.5, f-3dB >=230 Hz) - TV chassis or ultra-slim products; full DSP correction required

Amplification of 10-20W from a 16ohm-rated output is appropriate, delivering a peak SPL of 95.8 dB at 1 metre (10W AES). The 1.2mm Xmax is the primary mechanical constraint: any bass boost below 200 Hz must be applied conservatively with excursion limiting, as the thermal power rating may be unmet while mechanical over-excursion is already occurring at low frequencies. The inductance rolloff onset at 16,242 Hz is beyond the audio band, providing a substantially flat impedance characteristic across 20 Hz-16 kHz. In column array applications, the 57.3mm driver OD limits coherent vertical array directivity to approximately 3.0 kHz; the 4,761 Hz cone beaming onset provides complementary high-frequency directivity control above this point. The 21NFRX16-393D is suited for vertical column speaker arrays where 16ohm facilitates parallel wiring of multiple drivers to standard amplifier loads; flat-panel TV integration using open-back or minimal rear cavity with DSP management; outdoor and semi-outdoor column or surface-mount enclosures where NBR surround durability is required; and compact soundbar or portable products where high per-watt sensitivity and 16ohm impedance are system design requirements.