- High sensitivity, EXTENDED FREQUENCY RESPONSE
- 3 demodulation rings, powerful motor structure, dual air-gap
- High power handling
- The 123NPM is a truly unique full range woofer. We have designed cutting edge product, using the best avail-able materials and highly optimized design for the best performance in its class. It delivers very high efficiency, (96 dB 1watt / 1 meter), incredibly linear frequency response characteristics with extended HF frequency response, extreme high power handling capability, while
- generating ultra low harmonic distortion artifacts. The 123NPM uses a lightweight carbon fiber loaded cone assembly along with a high excursion triple roll constant geometry surround. This combination provides remarkable strength, high efficiency and a peak to peak linear excursion of 21mm.Magnetic CircuitThe magnetic circuit features two aluminum shorting rings,
- double air-gap front plate. The cooling system and the air flow has been designed using the modern FEM techniques and further optimized to provide the highest levels of cooling efficiency. 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: 8 Ohm Power handling AES Power: 800 Watts Program Power: 1,600 Watts Voice Coil Diameter: 4 in. Winding wire: CCAW Former: TIL Winding height: 23 mm T/S Parameters Resonant frequency: 58 Hz Re: 4.7 ohm Qes: 0.45 Qms: 12.6 Qts: 0.43 Vas: 31.6 liters Sd: 551 cm2 Mms: 100 grams Bl: 19.6 Le: 0.71 mH Sensitivity: 95.82 dB Design details Surround Material: Fabric Cone material: Paper Spider: Nomex Plate thickness: 12.5 mm Peak to peak linear cone Displacement 21.2 mm Overall diameter: 320.35 mm Bolt circle diameter: 299 mm Baffle cutout dia.: 281.9 mm Number of mounting holes: 8 Depth (flange to rear): 140.5 mm Net weight: 6.2 kg Ordering codes: 8 ohm version: 123NPMX8-185 Recone kits: Download: Spec download 2D drawing 3D model
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PRODUCT CODE: 123NPMX8-185
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 123NPMX8-185
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Driver: 123NPMX8-185 (123NPM) — 12" Mid-Woofer
Key T/S: Fs=58.0Hz, Qts=0.43, Vas=31.6L, Sens=95.82dB
Power: AES 800W / Cont 1600W / Peak 3200W
Xmax=5.25mm, Sd=551.0cm², Bl=19.6T·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: 25 liters
Tuning (Fb): 66 Hz
Est. -3dB: 61 Hz
HP Filter: 58 Hz (24dB/oct recommended)
Round Port: 100mm dia × 145mm long
Slot Port: 226mm W × 60mm H × 279mm L
Port Velocity: 15.2 m/s
Notes: Strong mid-bass impact, reduced cone excursion, maximum output
b) Balanced Response
Net Volume: 35 liters
Tuning (Fb): 55 Hz
Est. -3dB: 47 Hz
HP Filter: 45 Hz (24dB/oct recommended)
Round Port: 100mm dia × 165mm long
Slot Port: 226mm W × 60mm H × 313mm L
Port Velocity: 12.6 m/s
Notes: General-purpose PA/subwoofer, even response, good transient behavior
c) Extended Low Frequency
Net Volume: 40 liters
Tuning (Fb): 47 Hz
Est. -3dB: 40 Hz
HP Filter: 35 Hz (24dB/oct recommended)
Round Port: 100mm dia × 191mm long
Slot Port: 226mm W × 60mm H × 359mm L
Port Velocity: 10.9 m/s
Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 123NPMX8-185 is a 12-inch mid-woofer driver designed for professional 2-way and multi-way systems requiring high sensitivity (96 dB 1W/1m) and controlled low-frequency behavior. The driver uses a balanced motor-suspension design that provides good cone control while maintaining usable output across its operating bandwidth.
In bass reflex enclosures, the driver performs best in net internal volumes of 25 to 40 liters, tuned between 47 and 66 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. 800 W AES / 1600 W continuous) and DSP control. A high-pass filter in the range of 35–58 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 40–2000 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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