The Raven XL subwoofers are designed to produce very deep bass at realistic levels in a remarkably compact cabinet with extremely low distortion, minimum compression and fast transient response. We recommend typically 1 cuft sealed enclosure ( F3 = 42 Hz), or 3 cuft vented enclosure (F3 = 22 Hz). The Qts and rugged suspension make it also quite ideal for use in a transmission line.
Features
Magnetic Motor
Allows a +/-18 mm linear Xmax for extremely low distortion and high power handling.
The lightweight compact neodymium motor is a patented XBL design with two magnetic gaps and three Faraday rings to minimize inductance, flux modulation and intermodulation distortion.
The BL and inductance curves have a flat top to minimize 2nd and 3rd harmonic distortion and to optimize the impulse response. The audible result is explosive, uncompressed, dynamic.
Emissive Area
Cone and dust cap are made made of a woven carbon mat laminated to a high modulus paper so they are extremely rigid and highly damped, thus a very smooth frequency response up to 1500 Hz!
Suspension
A 25 mm wide rubber surround is used for long life even under high excursions.
Frame
A stiff cast aluminum basket is used for best sound quality and good cooling.
Cooling
The voice coil is directly cooled through radial holes on the motor so that cool air flow does not get restricted by box stuffing. Additional air vents through the cone itself help further to equalize pressure in front and back of the cone.
Amplifier to Use
It takes 800 W @ 1% THD into 4 Ω to reach Xmax
So we recommend a power amplifier of high quality of minimum 800 W and maximum 1600 W to get the most out of this exceptional drive unit.
Specifications
Thiele-Small parameters after 12 hour break in.
Fs = 26 Hz
Vas = 35 l
Cms = 0.23 mm/N
Mms = 164 g
Qts = 0.50
Qms = 4.7
Qes = 0.56
Sd = 330 cm^2
SPLo = 82.2 dB 1 watt into 4 ohms, 1 meter
sensitivity = 85.7 dB @ 2.83 volts, 1 meter
BL = 13.21 T/m
Le = 0.5 mH
Re = 3.63 Ω
Nominal Impedance = 4 Ω single voice coil
Recommended amplifier size = 800 W @ 1% THD into 4 Ω
Optimum Sealed Box Tune
1.23 cubic foot or 35 l with Black Hole Stuff
-3dB = 38 Hz
Fc = 37 Hz
Qtc = 0.7
Xmax +/- 18mm at 20 Hz = 280 watts into 4 ohms
Smallest Sealed Box Tune
0.35 cubic foot or 10 l with Black Hole Stuff
-3dB = 46 Hz
Fc = 51 Hz
Qtc = 1.0
Xmax +/- 18mm at 33 Hz = 808 watts into 4 ohms
Optimum Vented Box Tune
2.3 cubic foot or 65 l lined with Black Hole Five Internal Wall Damping
-3dB = 22 Hz
Port tune frequency = 20 Hz
**Port Tube, 4 inch diameter x 32 inch long, 101mm diameter x 813mm long
**MUST use a 18 Hz subsonic filter
Xmax +/- 18mm at 30 Hz = 440 watts into 4 ohms
Transmission Line with Linear Taper
-3dB = 30 Hz
Max amplifier size = 400 watts into 4 Ω
**MUST use a 20 Hz 12dB subsonic filter.
Speaker end area = 650 cm^2 [128in^2 ]
Exit area = 82 cm^2 [ 13in^2]
Pipe length = 3.75 m [148in]
Polyester Fiber Stuffing Density = 4 grams / liter, 4 oz / ft^3
.png)