LF
Mid-Woofer
8"
81XR
Code: 81XRX8-424A
Woofer/XR Woofer/8inch/Neo/Paper/200W/8ohm
Key Features
- Nonparallel voice and low frequency reproduction quality
- Patented magnetic circuit and air venting design
- Extremely low harmonic distortion
Quick Specs
Impedance
8 Ω
Program Power
400 W
Sensitivity
93.00 dB
Fs
73.00 Hz
Magnet
Neodymium
Voice Coil
63.5 mm
Design Notes
The 81XR 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 30mm 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 that utilizes static coil. Unique gap side venting ensures good air circulation, lowers air noise 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 30mm 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 that utilizes static coil. Unique gap side venting ensures good air circulation, lowers air noise and greatly improves the reliability of this driver.
Specifications
General Specs
Nominal Diameter
8"
Rated Impedance
8 Ohm
Magnet
Neodymium
Basket Material
Aluminum
Power Handling
AES Power
200 W
Continuous Power
400 W
Peak Power
800 W
Voice Coil
Diameter
63.5 mm
Former
Glass Fiber
Winding Height
18.3 mm
T/S Parameters
Resonant Frequency (Fs)
73.00 Hz
Re
5.50 \u2126
Qes
0.370
Qms
1.47
Qts
0.300
Vas
7.20 liters
Sd
201.00 cm\u00B2
Mms
38.00 grams
Rms
11.90
Cms
0.1300
Bl
16.00 T\u00B7m
Le
0.190 mH
Sensitivity
93.00 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper GF
Spider
Nomex
T-Plate
31 mm
Xmax (peak)
6.35 mm
Xmech
25 mm
Overall Diameter
210.00 mm
Bolt Circle Diameter
195.00 mm
Baffle Cutout Dia.
186.88 mm
Mounting Holes
8
Depth (flange to rear)
128.30 mm
Net Weight
4.90 kg
Ordering Codes
Product Code
81XRX8-424A
Downloads
Frequency Response & Impedance
2D Drawing
Enclosure Recommendations
Recommended enclosure alignments (bass reflex): - 6 liters tuned to 77 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 71 Hz, HP filter 69 Hz - 8 liters tuned to 68 Hz: balanced response, general-purpose (recommended); -3 dB approx. 58 Hz, HP filter 58 Hz - 10 liters tuned to 59 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 50 Hz, HP filter 47 Hz
Frequently Asked Questions
- - Nonparallel voice and low frequency reproduction quality
- - Patented magnetic circuit and air venting design
- - Extremely low harmonic distortion
Recommended enclosure alignments (bass reflex): - 6 liters tuned to 77 Hz: high output, strong mid-bass, reduced excursion; -3 dB approx. 71 Hz, HP filter 69 Hz - 8 liters tuned to 68 Hz: balanced response, general-purpose (recommended); -3 dB approx. 58 Hz, HP filter 58 Hz - 10 liters tuned to 59 Hz: extended low-frequency, requires HP filter protection; -3 dB approx. 50 Hz, HP filter 47 Hz
Vented pa mid-woofer, 2-way compact top; low-distortion high-excursion pa applications; weight-critical installs
AES Power: 200 W,
Continuous: 400 W,
Peak: 800 W.
Sensitivity: 93.00 dB (1W/1m).
