LF
Mid-Woofer
12"
121NPM
Code: 121NPMX8-079
Mid woofer/12inch/Neo/Paper/450W/8ohm
Key Features
- Very high efficiency mid-woofer
- Linear frequency response, low harmonic distortion
- Lightweight carbon fiber loaded paper cone, nomex spider
Quick Specs
Impedance
8 Ω
Program Power
900 W
Sensitivity
99.97 dB
Fs
50.00 Hz
Magnet
Neodymium
Voice Coil
76 mm
Design Notes
The 121NPM is a ultra high efficiency, (100dB 1watt / 1 meter) 12-inch mid bass woofer with incredibly linear frequency response characteristics, extreme high power handling capability while generating low harmonic distortion artifacts.-
The 121NPM uses a lightweight carbon fiber loaded cone assembly along with a precision double roll constant geometry surround. This combination provides remarkable strength, high efficiency and a excursion linearity of 14.2mm.
Magnetic Circuit
REDCATT engineers have developed a lightweight, neodymium outside ring 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.
The 121NPM uses a lightweight carbon fiber loaded cone assembly along with a precision double roll constant geometry surround. This combination provides remarkable strength, high efficiency and a excursion linearity of 14.2mm.
Magnetic Circuit
REDCATT engineers have developed a lightweight, neodymium outside ring 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
8 Ohm
Magnet
Neodymium
Basket Material
Aluminum
Power Handling
AES Power
450 W
Continuous Power
900 W
Peak Power
1800 W
Voice Coil
Diameter
76 mm
Winding Wire
CCAW
Former
Glass Fiber
Winding Height
13 mm
T/S Parameters
Resonant Frequency (Fs)
50.00 Hz
Re
6.00 \u2126
Qes
0.160
Qms
7.51
Qts
0.160
Vas
59.20 liters
Sd
531.00 cm\u00B2
Mms
66.70 grams
Rms
2.79
Cms
0.1500
Bl
27.80 T\u00B7m
Le
0.510 mH
Sensitivity
99.97 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper CF
Spider
Nomex
T-Plate
10 mm
Xmax (peak)
1.5 mm
Xmech
11.5 mm
Overall Diameter
315.00 mm
Bolt Circle Diameter
298.00 mm
Baffle Cutout Dia.
285.00 mm
Mounting Holes
8
Depth (flange to rear)
123.50 mm
Net Weight
4.00 kg
Ordering Codes
Product Code
121NPMX8-079
Downloads
Frequency Response & Impedance
2D Drawing
Enclosure Recommendations
Recommended enclosure alignments (bass reflex): - 70 liters tuned to 47 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 40 Hz, HP filter 39 Hz - 85 liters tuned to 41 Hz: balanced response, general-purpose (recommended); -3 dB approx. 35 Hz, HP filter 31 Hz - 90 liters tuned to 38 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 32 Hz, HP filter 26 Hz
Frequently Asked Questions
- - Very high efficiency mid-woofer
- - Linear frequency response, low harmonic distortion
- - Lightweight carbon fiber loaded paper cone, nomex spider
Recommended enclosure alignments (bass reflex): - 70 liters tuned to 47 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 40 Hz, HP filter 39 Hz - 85 liters tuned to 41 Hz: balanced response, general-purpose (recommended); -3 dB approx. 35 Hz, HP filter 31 Hz - 90 liters tuned to 38 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 32 Hz, HP filter 26 Hz
Vented pa bass cabinet or subwoofer; weight-critical installs
AES Power: 450 W,
Continuous: 900 W,
Peak: 1800 W.
Sensitivity: 99.97 dB (1W/1m).
