LF
Fullrange
4"
40NFR
Code: 40NFRX16-223
Full-Range/4inch/Neo/GF/25W/16ohm
Key Features
- Full-range FREQUENCY RESPONSE
- Unique cone material
- For column systems, desktop high performance 2 way or one-way speakers, hi-fi applications
Quick Specs
Impedance
16 Ω
Program Power
50 W
Sensitivity
85.52 dB
Fs
115.00 Hz
Magnet
Neodymium
Voice Coil
19 mm
Design Notes
The 40NFR is a very high efficiency, (86dB 1watt / 1 meter) 4-inch full range speaker with linear frequency response characteristics and high power handling capability while generating low harmonic distortion artifacts. The 40NFR uses a unique exponential cone, made off very lightweight glass-carbon fiber woven fabric, along with a NBR single roll geometry surround. The combination provides remarkable strength, high efficiency and sustained output under extreme conditions.
Magnetic circuit design
REDCATT engineers have developed neodymium based magnetic circuit, capable of delivering the highest level of performance, providing a consistent, high integrity magnetic flux gap, low distortion characteristic. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability. The compact size of the magnetic circuit ensures the speaker can fit in tight space of modern audio product designs.
Magnetic circuit design
REDCATT engineers have developed neodymium based magnetic circuit, capable of delivering the highest level of performance, providing a consistent, high integrity magnetic flux gap, low distortion characteristic. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability. The compact size of the magnetic circuit ensures the speaker can fit in tight space of modern audio product designs.
Specifications
General Specs
Nominal Diameter
4"
Rated Impedance
16 Ohm
Magnet
Neodymium
Basket Material
Steel
Power Handling
AES Power
25 W
Continuous Power
50 W
Peak Power
100 W
Voice Coil
Diameter
19 mm
Winding Wire
CCAW
Former
Kapton
Winding Height
4.9 mm
T/S Parameters
Resonant Frequency (Fs)
115.00 Hz
Re
12.30 \u2126
Qes
1.300
Qms
6.20
Qts
1.100
Vas
1.50 liters
Sd
50.20 cm\u00B2
Mms
4.40 grams
Rms
0.51
Cms
0.4400
Bl
5.30 T\u00B7m
Le
0.200 mH
Sensitivity
85.52 dB
Design Details
Surround Material
NBR
Cone/Dome Material
Paper CF
Spider
Nomex
T-Plate
4 mm
Xmax (peak)
0.45 mm
Xmech
4.45 mm
Overall Diameter
103.50 mm
Bolt Circle Diameter
115.00 mm
Baffle Cutout Dia.
91.00 mm
Mounting Holes
4
Depth (flange to rear)
50.50 mm
Net Weight
0.20 kg
Ordering Codes
Product Code
40NFRX16-223
Downloads
Frequency Response & Impedance
2D Drawing
Enclosure Recommendations
Free-air or open-back installation is the primary recommendation for this driver (Fs = 115 Hz, Qts = 1.1, Vas = 1.5 liters): any sealed cavity raises Qtc above 1.1 and increases the system resonance above 115 Hz, requiring DSP correction for flat response. Where a sealed rear cavity is necessary for structural or protection reasons, three reference alignments are available: - 1.5 liters (Qtc approx. 1.56): minimum practical volume; resonance approx. 183 Hz; full DSP required - 3.0 liters (Qtc approx. 1.25): moderate column bay volume; resonance approx. 146 Hz; DSP correction recommended above 100 Hz - 6.0 liters (Qtc approx. 1.13): largest practical volume; resonance approx. 122 Hz; closest to free-air character, DSP correction of 115 Hz resonance peak recommended
Frequently Asked Questions
- - Full-range FREQUENCY RESPONSE
- - Unique cone material
- - For column systems, desktop high performance 2 way or one-way speakers, hi-fi applications
Free-air or open-back installation is the primary recommendation for this driver (Fs = 115 Hz, Qts = 1.1, Vas = 1.5 liters): any sealed cavity raises Qtc above 1.1 and increases the system resonance above 115 Hz, requiring DSP correction for flat response. Where a sealed rear cavity is necessary for structural or protection reasons, three reference alignments are available: - 1.5 liters (Qtc approx. 1.56): minimum practical volume; resonance approx. 183 Hz; full DSP required - 3.0 liters (Qtc approx. 1.25): moderate column bay volume; resonance approx. 146 Hz; DSP correction recommended above 100 Hz - 6.0 liters (Qtc approx. 1.13): largest practical volume; resonance approx. 122 Hz; closest to free-air character, DSP correction of 115 Hz resonance peak recommended
Pa column midrange, small two-way monitors; weight-critical installs
AES Power: 25 W,
Continuous: 50 W,
Peak: 100 W.
Sensitivity: 85.52 dB (1W/1m).
