- EXTENDED FREQUENCY RESPONSE
- Rib reinforced paper cone
- High power handling
- 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 CircuitREDCATT 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.
General specs Nominal Diameter: 12 in. Rated Impedance: 4 Ohm Power handling AES Power: 300 Watts Program Power: 600 Watts Voice Coil Diameter: 2.5 in. Winding wire: CCAW Former: kapton Winding height: 13.5 mm T/S Parameters Resonant frequency: 45 Hz Re: 3.1 ohm Qes: 0.29 Qms: 4.96 Qts: 0.27 Vas: 98.5 liters Sd: 531 cm2 Mms: 52.1 grams Bl: 12.8 Le: 0.42 mH Sensitivity: 97.75 dB Design details Surround Material: Fabric Cone material: Paper Spider: Nomex Plate thickness: 8 mm Peak to peak linear cone Displacement 10.2 mm Overall diameter: 320 mm Bolt circle diameter: 302 mm Baffle cutout dia.: 282 mm Number of mounting holes: 8 Depth (flange to rear): 127.8 mm Net weight: 5 kg Ordering codes: 8 ohm version: 123FPMX4-188B Recone kits: Download: Spec download 2D drawing 3D model
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PRODUCT CODE: 123FPMX4-188B
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 123FPMX4-188B
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Driver: 123FPMX4-188B (123FPM) — 12" Mid-Woofer
Key T/S: Fs=45.0Hz, Qts=0.27, Vas=98.5L, Sens=97.75dB
Power: AES 300W / Cont 600W / Peak 1200W
Xmax=2.75mm, Sd=531.0cm², Bl=12.8T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Round port (100mm diameter) — standard for mid-size professional enclosures; good balance of area and packaging
a) High SPL
Net Volume: 70 liters
Tuning (Fb): 52 Hz
Est. -3dB: 48 Hz
HP Filter: 44 Hz (24dB/oct recommended)
Round Port: 100mm dia × 49mm long
Slot Port: 226mm W × 60mm H × 114mm L
Port Velocity: 6.0 m/s
Notes: Strong mid-bass impact, reduced cone excursion, maximum output
b) Balanced Response
Net Volume: 80 liters
Tuning (Fb): 47 Hz
Est. -3dB: 43 Hz
HP Filter: 37 Hz (24dB/oct recommended)
Round Port: 100mm dia × 59mm long
Slot Port: 226mm W × 60mm H × 131mm L
Port Velocity: 5.5 m/s
Notes: General-purpose PA/subwoofer, even response, good transient behavior
c) Extended Low Frequency
Net Volume: 90 liters
Tuning (Fb): 43 Hz
Est. -3dB: 37 Hz
HP Filter: 31 Hz (24dB/oct recommended)
Round Port: 100mm dia × 74mm long
Slot Port: 226mm W × 60mm H × 157mm L
Port Velocity: 5.0 m/s
Notes: Deep bass extension, requires proper system protection below tuning
--- 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.
In bass reflex enclosures, the driver performs best in net internal volumes of 70 to 90 liters, tuned between 43 and 52 Hz. This alignment provides a balanced combination of low-frequency extension, cone control around resonance, and efficient port loading. Lower tuning improves deep bass extension but increases excursion below tuning, requiring appropriate high-pass filtering. Higher tuning increases sensitivity and output in the upper bass region while improving mechanical control.
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.
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