LF
Mid-Woofer
12"
123FPM
Code: DR-12-020-4R-B2-C0001
Mid-woofer/12inch/Ferrite/Paper/300W/4ohm
Key Features
- EXTENDED FREQUENCY RESPONSE
- Rib reinforced paper cone
- High power handling
Quick Specs
Impedance
4 Ω
Program Power
600 W
Sensitivity
97.75 dB
Fs
45.00 Hz
Magnet
Ferrite
Voice Coil
63.5 mm
Design Notes
The 123FPM is a high efficiency, (98 dB 1watt / 1 meter) 12-inch mid bass woofer with incredibly linear frequency response characteristics. The 123FPM uses a lightweight rib-reinforced cone assembly along with a precision double roll constant geometry surround. This combination provides remarkable strength, high efficiency and a excursion linearity of 10.2mm.
Magnetic Circuit
REDCATT engineers have developed a lightweight, inside-neodymium slug based magnetic circuit capable of delivering the highest level of performance providing a consistent, high integrity magnetic flux gap, ultra low distortion characteristic and high efficiency cooling system. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability.
Magnetic Circuit
REDCATT engineers have developed a lightweight, inside-neodymium slug based magnetic circuit capable of delivering the highest level of performance providing a consistent, high integrity magnetic flux gap, ultra low distortion characteristic and high efficiency cooling system. The magnetic circuit design is optimized to generate the minimum amount of flux modulation, providing exceptional stability.
Specifications
General Specs
Nominal Diameter
12"
Rated Impedance
4 Ohm
Magnet
Ferrite
Basket Material
Steel
Power Handling
AES Power
300 W
Continuous Power
600 W
Peak Power
1200 W
Voice Coil
Diameter
63.5 mm
Winding Wire
CCAW
Former
Glass Fiber
Winding Height
13.5 mm
T/S Parameters
Resonant Frequency (Fs)
45.00 Hz
Re
3.10 \u2126
Qes
0.290
Qms
4.96
Qts
0.270
Vas
98.50 liters
Sd
531.00 cm\u00B2
Mms
52.10 grams
Rms
2.97
Cms
0.2400
Bl
12.80 T\u00B7m
Le
0.420 mH
Sensitivity
97.75 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper GF
Spider
Nomex
T-Plate
8 mm
Xmax (peak)
2.75 mm
Xmech
10.75 mm
Overall Diameter
320.00 mm
Bolt Circle Diameter
302.00 mm
Baffle Cutout Dia.
282.00 mm
Mounting Holes
8
Depth (flange to rear)
127.80 mm
Net Weight
5.00 kg
Ordering Codes
Product Code
DR-12-020-4R-B2-C0001
Downloads
Frequency Response & Impedance
2D Drawing
Technical Summary
The 123FPMX4-188B is a 12-inch mid-woofer driver designed for professional 2-way and multi-way systems requiring high sensitivity (98 dB 1W/1m) and controlled low-frequency behavior. The motor and suspension are optimized to maintain consistent performance at high drive levels, with controlled excursion and reduced thermal compression during long-term operation.
The driver is intended for use with high-power amplification (approx. 300 W AES / 600 W continuous) and DSP control. A high-pass filter in the range of 31-44 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 37-2000 Hz, covering bass through upper-mid frequencies for direct integration with a compression driver or tweeter in a two-way or multi-way system.
This design is particularly effective in single or multi-driver bass reflex systems used in professional two-way and multi-way PA systems, powered monitors, and compact bass-reflex enclosures, where extended bandwidth, controlled distortion across the full operating range, and versatile system integration are required.
The driver is intended for use with high-power amplification (approx. 300 W AES / 600 W continuous) and DSP control. A high-pass filter in the range of 31-44 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 37-2000 Hz, covering bass through upper-mid frequencies for direct integration with a compression driver or tweeter in a two-way or multi-way system.
This design is particularly effective in single or multi-driver bass reflex systems used in professional two-way and multi-way PA systems, powered monitors, and compact bass-reflex enclosures, where extended bandwidth, controlled distortion across the full operating range, and versatile system integration are required.
Recommended enclosure volumes are simulated results. For best enclosure volumes and tuning, we recommend secondary simulation and careful evaluation. Several rounds of samples and fine-tuning may be required for optimal results.
Enclosure Recommendations
Recommended enclosure alignments (bass reflex): - 70 liters tuned to 52 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 48 Hz, HP filter 44 Hz - 90 liters tuned to 46 Hz: balanced response, general-purpose (recommended); -3 dB approx. 42 Hz, HP filter 36 Hz - 90 liters tuned to 43 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 37 Hz, HP filter 31 Hz
Frequently Asked Questions
- - EXTENDED FREQUENCY RESPONSE
- - Rib reinforced paper cone
- - High power handling
Recommended enclosure alignments (bass reflex): - 70 liters tuned to 52 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 48 Hz, HP filter 44 Hz - 90 liters tuned to 46 Hz: balanced response, general-purpose (recommended); -3 dB approx. 42 Hz, HP filter 36 Hz - 90 liters tuned to 43 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 37 Hz, HP filter 31 Hz
Vented pa bass-mid or 2-way pa cabinet
AES Power: 300 W,
Continuous: 600 W,
Peak: 1200 W.
Sensitivity: 97.75 dB (1W/1m).
