Data Sheet

FREQUENCY RESPONSE DATA*
IMPEDANCE
PREDICTED BASS RESPONSE
* Half space response measured in a 975 litre sealed box
12.19”
309.5 mm
13”
330.2mm
5.39”
137 mm
7.48”
190 mm
** Normalized bass response in 50 litre tuned to 70Hz
• Please enquire about alternative impedances.
• A.E.S. power handling test. Pink noise bandpass filtered at 12 dB per octave with cutoff frequencies of 50 Hz and 500 Hz. Driver mounted in
free air, test signal applied at rated power for two hours.
• Please note that the frequency response measurements are supplied for comparison only and are not a measure of the low frequency
performance which may be achieved in a fully optimised system.
MOUNTING / SHIPPING INFORMATION
Overall Diameter
13” / 330.2 mm
Width Across Flats
12.19” / 309.5 mm
Flange Height
0.305” / 7.8 mm
Bafe Hole Diameter F/M
11.03” / 281 mm
Bafe Hole Diameter R/M
10.13” / 257 mm
Gasket Supplied
Front & Rear
Fixing Holes
4x 0.218” diam on 12.5 PCD
4x 5.5 mm diam on 317.5
PCD
Depth
5.39” / 137 mm
Weight
17.1 lb / 7.8 kg
Recommended Enclosure Volume
0.88 - 2.83 cu ft /
25 - 80 litres
Shipping Weight
20.2 lb / 9.2 kg
Packing Carton Dimensions
340 x 340 x 222 mm
MATERIALS OF CONSTRUCTION
Former Material
Glass Fibre
Voice Coil
Aluminium ‘sandwich’ inside
and outside windings
Magnet Material
Ferrite
Chassis
Die-cast Aluminium
Cone
Curvilinear polycellulose
Surround / Edge Termination
Polyvinyl Damped Multi Roll
Linen
Dust Dome
Solid Paper
Connectors
Push-button Spring
Terminals
Polarity
Positive Voltage at Red
Terminal Causes Forward
Motion of Cone
THIELE SMALL PARAMETERS
FS Hz
55 Hz
RE Ohms
5.5 Ω
Qms
2.05
Qes
0.333
Qts
0.286
Vas Ltr
56
Vd litres
0.58
CMS (mm/N)
0.142
BL T/m
18.3
Mms (grms)
59
Xmax (mm)
5.5
Sd (cm
2
)
0.053 m2
Efciency %
2.71
Le (1k Hz)
1.56 mH
ELECTRO ACOUSTIC SPECIFICATIONS
Nominal Chassis Diameter
12”
Impedance
8 Ω
Power Handling
500 w (A.E.S.)
Peak Power (6dB Crest Factor)
2000 w (A.E.S.)
Usable Frequency Range -6dB
40 Hz - 3.5 kHz
Sensitivity (1 w - 1 m)
98 dB
Moving Mass inc. Air Load
59 grams
Minimum Impedance Zmin
7 Ω
Effective Piston Diameter
10.24” / 260 mm
Peak Displacement Volume of
Cone Vd
0.33 litres
Magnet Weight
93 oz
Magnetic Gap Depth
0.35” / 9 mm
Flux Density
1.16 Tesla
Coil Winding Height
0.70” / 18 mm
Voice Coil Diameter
3.0” / 77 mm
The Colossus 12MB is intended for use as a very high-output bass mid driver in two-way ported enclosures
and also as a bass driver in multi way systems. The unit features a 3 inch ‘sandwich’ inside and outside
windings voice coil driven by a non-inductive motor system which dramatically reduces third-harmonic and
intermodulation distortion. The cone membrane, manufactured from polycellulose, is much stronger and more
durable than conventional paper pulp alternatives. This allows the driver to combine high-sensitivity with the
structural integrity required to produce undistorted low frequencies at high output levels. The mechanical and
electrical properties of the unit have been carefully optimised to allow extended low frequency output up to its
rated power handling of 500 Watts (A.E.S) continuous, with peak power handling in excess of 2000 Watts. The
driver exhibits an average sensitivity of 98 dB and is best used in ported enclosures of 25 to 80 litres.
+6
-6
-12
-18
-24
-30
-36
0
dB
Hz
5 10 50 100
500
1k
5k
10k
20k
200
100
20
10
5
2
1
50
Ohms
Hz
20 50 100
200
500
1k 2k
5k
10k
20k
+120
+110
+100
+90
+80
+70
+60
+50
dBr
Hz
20 50 100
200
500
1k 2k
5k
10k
20k
PROFESSIONAL SERIES
COLOSSUS 12MB
COLOSSUS 12MB