41FR 41FR
LF Fullrange 4"

41FR

Code: 41FRX8-360B

Full-Range/4inch/Ferrite/Paper/20W/8ohm

Key Features

  • Very good performance at affordable price
  • Excellent HF extension
  • Array applications, 2-way systems, can be used without HF unit

Quick Specs

Impedance

8 Ω

Program Power

40 W

Sensitivity

89.44 dB

Fs

134.00 Hz

Magnet

Ferrite

Voice Coil

25.4 mm

Design Notes

41FR is ferrite based mid-woofer, developed for applications where small size mid-woofer is required. This version was developed with extended HF response and in some cases could be used as full-range driver. Yet, this driver delivers very good performance low frequency range as well.
Our engineers have chosen lightweight, yet strong, paper cone with rubber surround. Cone optimized shape brings remarkable strength of the piston and greatly improves harmonic distortion artifacts.
Overall this model delivers very good performance and is well balanced between performance - cost.

Specifications

General Specs

Nominal Diameter 4"
Rated Impedance 8 Ohm
Magnet Ferrite
Basket Material Steel

Power Handling

AES Power 20 W
Continuous Power 40 W
Peak Power 80 W

Voice Coil

Diameter 25.4 mm
Winding Wire CCAW
Former kapton
Winding Height 7.2 mm

T/S Parameters

Resonant Frequency (Fs) 134.00 Hz
Re 5.60 \u2126
Qes 0.810
Qms 10.60
Qts 0.750
Vas 1.30 liters
Sd 50.30 cm\u00B2
Mms 3.80 grams
Rms 0.30
Cms 0.3700
Bl 4.78 T\u00B7m
Le 0.090 mH
Sensitivity 89.44 dB

Design Details

Surround Material NBR
Cone/Dome Material Paper CF
Spider Nomex
T-Plate 5 mm
Xmax (peak) 1.1 mm
Xmech 6.1 mm
Overall Diameter 105.50 mm
Bolt Circle Diameter 106.00 mm
Baffle Cutout Dia. 93.60 mm
Mounting Holes 4
Depth (flange to rear) 55.90 mm
Net Weight 0.78 kg

Ordering Codes

Product Code 41FRX8-360B

Frequency Response & Impedance

Frequency response of 41FR

2D Drawing

2D drawing of 41FR

Enclosure Recommendations

The 41FRX8-360B is primarily suited to very compact sealed enclosures and near-field desktop applications (Fs = 134 Hz, Qts = 0.75, Vas = 1.3 liters). Practical sealed volumes are:
- 0.10 liters (Qtc approx. 1.3): ultra-compact sealed for panel-mounted near-field systems; system resonance approx. 205 Hz; requires HP crossover at 2,000-3,000 Hz
- 0.25 liters (Qtc approx. 1.1): compact desktop enclosure; system resonance approx. 178 Hz; best matched with tweeter crossover at 2.5 kHz
- 0.55 liters (Qtc approx. 0.9): small sealed enclosure; system resonance approx. 162 Hz; usable as standalone full-range in near-field with no tweeter
Free-air and open-back baffle installations are viable for extended HF coverage; the ferrite motor provides adequate mechanical control in unenclosed configurations.

Frequently Asked Questions

  • - Very good performance at affordable price
  • - Excellent HF extension
  • - Array applications, 2-way systems, can be used without HF unit
The 41FRX8-360B is primarily suited to very compact sealed enclosures and near-field desktop applications (Fs = 134 Hz, Qts = 0.75, Vas = 1.3 liters). Practical sealed volumes are:
- 0.10 liters (Qtc approx. 1.3): ultra-compact sealed for panel-mounted near-field systems; system resonance approx. 205 Hz; requires HP crossover at 2,000-3,000 Hz
- 0.25 liters (Qtc approx. 1.1): compact desktop enclosure; system resonance approx. 178 Hz; best matched with tweeter crossover at 2.5 kHz
- 0.55 liters (Qtc approx. 0.9): small sealed enclosure; system resonance approx. 162 Hz; usable as standalone full-range in near-field with no tweeter
Free-air and open-back baffle installations are viable for extended HF coverage; the ferrite motor provides adequate mechanical control in unenclosed configurations.
Pa column midrange, small two-way monitors
AES Power: 20 W, Continuous: 40 W, Peak: 80 W. Sensitivity: 89.44 dB (1W/1m).

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