LF
Fullrange
3"
31NFR
Code: 31NFRX8-229
Full-Range/3inch/Neo/Aluminum/30W/8ohm
Key Features
- EXTENDED FREQUENCY RESPONSE
- Hard anodized Aluminum cone
- Usage in hi-fi, columns, outdoor and portable products
Quick Specs
Impedance
8 Ω
Program Power
60 W
Sensitivity
84.49 dB
Fs
115.00 Hz
Magnet
Neodymium
Voice Coil
25.4 mm
Design Notes
The 31NFR is a high efficiency, (84dB 1watt / 1 meter) 3-inch full range speaker with very linear frequency response characteristics and high power handling capability. The 31NFR uses a lightweight anodized aluminum cone assembly along with a NBR single roll geometry surround. The combination provides high efficiency, extended high frequency response and sustained output under variety of conditions, while generating low harmonic distortion over the working range of this speaker.
Magnetic circuit design
REDCATT engineers have developed neodymium based magnetic circuit with small form factor, high integrity magnetic flux gap and low distortion characteristic. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability. Copper demodulation cup is assembled over the t-pole.
Magnetic circuit design
REDCATT engineers have developed neodymium based magnetic circuit with small form factor, high integrity magnetic flux gap and low distortion characteristic. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability. Copper demodulation cup is assembled over the t-pole.
Specifications
General Specs
Nominal Diameter
3"
Rated Impedance
8 Ohm
Magnet
Neodymium
Basket Material
Plastic
Power Handling
AES Power
30 W
Continuous Power
60 W
Peak Power
120 W
Voice Coil
Diameter
25.4 mm
Former
Kapton
Winding Height
7.4 mm
T/S Parameters
Resonant Frequency (Fs)
115.00 Hz
Re
6.30 \u2126
Qes
0.940
Qms
15.10
Qts
0.880
Vas
0.85 liters
Sd
28.30 cm\u00B2
Mms
2.50 grams
Rms
0.12
Cms
0.7700
Bl
3.50 T\u00B7m
Le
0.090 mH
Sensitivity
84.49 dB
Design Details
Surround Material
NBR
Cone/Dome Material
Aluminum
Spider
Nomex
T-Plate
4 mm
Xmax (peak)
1.7 mm
Xmech
5.7 mm
Overall Diameter
78.70 mm
Bolt Circle Diameter
84.00 mm
Baffle Cutout Dia.
71.50 mm
Mounting Holes
4
Depth (flange to rear)
45.30 mm
Net Weight
0.18 kg
Ordering Codes
Product Code
31NFRX8-229
Downloads
Frequency Response & Impedance
2D Drawing
Enclosure Recommendations
Recommended enclosure alignments (sealed): - 0.05 liters (Qtc 0.85): compact, punchy character; system resonance approx. 488 Hz - 0.05 liters (Qtc 0.707): maximally flat Butterworth response (recommended); system resonance approx. 488 Hz - 0.05 liters (Qtc 0.6): extended response, smooth gradual rolloff; system resonance approx. 488 Hz
Frequently Asked Questions
- - EXTENDED FREQUENCY RESPONSE
- - Hard anodized Aluminum cone
- - Usage in hi-fi, columns, outdoor and portable products
Recommended enclosure alignments (sealed): - 0.05 liters (Qtc 0.85): compact, punchy character; system resonance approx. 488 Hz - 0.05 liters (Qtc 0.707): maximally flat Butterworth response (recommended); system resonance approx. 488 Hz - 0.05 liters (Qtc 0.6): extended response, smooth gradual rolloff; system resonance approx. 488 Hz
Hi-Fi column speakers, outdoor and portable products, multi-way systems
AES Power: 30 W,
Continuous: 60 W,
Peak: 120 W.
Sensitivity: 84.49 dB (1W/1m).
