LF
Woofer
12"
121XR
Code: DR-12-017-8R-B2-C0001
XR Woofer/12inch/Neo/Paper/500W/8ohm
Key Features
- EXTENDED FREQUENCY RESPONSE, high excursion, ultra low THD
- Static demodulation coil, large spider with stitched tinsel wires
- Carbon fiber loaded paper cone
Quick Specs
Impedance
8 Ω
Program Power
1000 W
Sensitivity
95.78 dB
Fs
46.00 Hz
Magnet
Neodymium
Voice Coil
63.5 mm
Design Notes
The 121XR was designed to be simply the best driver for 2-way and multi-way systems on the market, yet this driver will also shine in sub-woofer applications. The combination of our XR patented technology with static shorting coil brings an nonparallel opportunity to the audio designers. The common request for 2-way speakers is “more of everything”. Designers wishes for more bass, more mids. Well, there you have it! But not only that. We bring this with clarity in the mid-frequencies and undistorted bass. Our designers were able to achieve THD below 0.5% from 20Hz up to 2.5kHz. There isn’t another driver like this on the market.
Motor Design
The magnetic design incorporates large neodymium magnets placed along the voice coil winding, together with the 2nd and static coil placed on the pole piece. This has allowed us to push the cone excursion to 25mm peak to peak, while lowering the inductance. The shorting coil covers the complete main coil excursion. This is also an improvement compared to some previous designs on the market. Unique gap venting ensures good air circulation and greatly improves the reliability of this driver.
Motor Design
The magnetic design incorporates large neodymium magnets placed along the voice coil winding, together with the 2nd and static coil placed on the pole piece. This has allowed us to push the cone excursion to 25mm peak to peak, while lowering the inductance. The shorting coil covers the complete main coil excursion. This is also an improvement compared to some previous designs on the market. Unique gap venting ensures good air circulation and greatly improves the reliability of this driver.
Specifications
General Specs
Nominal Diameter
12"
Rated Impedance
8 Ohm
Magnet
Neodymium
Basket Material
Aluminum
Power Handling
AES Power
500 W
Continuous Power
1000 W
Peak Power
2000 W
Voice Coil
Diameter
63.5 mm
Winding Wire
Copper
Former
Glass Fiber
Winding Height
18.3 mm
T/S Parameters
Resonant Frequency (Fs)
46.00 Hz
Re
5.60 \u2126
Qes
0.420
Qms
1.56
Qts
0.330
Vas
69.10 liters
Sd
531.00 cm\u00B2
Mms
66.80 grams
Rms
12.37
Cms
0.1800
Bl
16.00 T\u00B7m
Le
0.160 mH
Sensitivity
95.78 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper CF
Spider
Nomex
T-Plate
31 mm
Xmax (peak)
6.35 mm
Xmech
29.85 mm
Overall Diameter
320.00 mm
Bolt Circle Diameter
299.00 mm
Baffle Cutout Dia.
281.00 mm
Mounting Holes
8
Depth (flange to rear)
172.50 mm
Net Weight
5.10 kg
Ordering Codes
Product Code
DR-12-017-8R-B2-C0001
Downloads
Frequency Response & Impedance
2D Drawing
Technical Summary
The 121XRX8-352 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 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. 500 W AES / 1000 W continuous) and DSP control. A high-pass filter in the range of 27-43 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 33-2000 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. 500 W AES / 1000 W continuous) and DSP control. A high-pass filter in the range of 27-43 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 33-2000 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): - 55 liters tuned to 51 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 47 Hz, HP filter 43 Hz - 65 liters tuned to 45 Hz: balanced response, general-purpose (recommended); -3 dB approx. 38 Hz, HP filter 35 Hz - 80 liters tuned to 39 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 33 Hz, HP filter 27 Hz
Frequently Asked Questions
- - EXTENDED FREQUENCY RESPONSE, high excursion, ultra low THD
- - Static demodulation coil, large spider with stitched tinsel wires
- - Carbon fiber loaded paper cone
Recommended enclosure alignments (bass reflex): - 55 liters tuned to 51 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 47 Hz, HP filter 43 Hz - 65 liters tuned to 45 Hz: balanced response, general-purpose (recommended); -3 dB approx. 38 Hz, HP filter 35 Hz - 80 liters tuned to 39 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 33 Hz, HP filter 27 Hz
Vented pa bass cabinet or subwoofer; low-distortion high-excursion pa applications; weight-critical installs
AES Power: 500 W,
Continuous: 1000 W,
Peak: 2000 W.
Sensitivity: 95.78 dB (1W/1m).
