0020 12W700 - Eighteen Sound
12W700
LF Ferrite Transducer
KeyFeatures
98 dB SPL 1W / 1m average sensitivity
75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
450 W AES power handling
Excellent transient response
Weather protected cone and plates for outdoor usage
Improved heat dissipation via unique basket design
Ideal for compact two way, multiway systems and subwoofer applications
Description
The 12W700 meets the specific market requirement for a loudspeaker which combines the
excellent linearity, good efficiency and high power handling of the 15W700 model but in a 12 inch
(300mm) chassis for use in more compact systems. It is primarily intended for application in
compact reflex and band-pass enclosures but can also be used for horn loaded configurations.
The ribbed curvilinear paper cone has been made from a special high strength woodpulp
designed to achieve the best possible linearity within its intended frequency range and to
control bell-mode resonances around the cone circumference. The cone is carried by an
unusually deep profile, triple roll suspension made from a polycotton material which is more
resistant to aging and fatigue than traditional cotton-based ones. The 75 mm (3 inch) diameter
voice coil employs the Interleaved Sandwich Voice coil (ISV) technology, in which a high strength
fiberglas former carries windings on both the outer and inner surfaces to achieve a mass
balanced coil. This results in an extremely linear motor assembly with a reduced tendency for
eccentric behavior when driven hard. The magnetic structure has been optimized using FEACAD
resource to maximize the flux density in the voice coil gap. Voice coil cooling has been achieved
by incorporating airways between the chassis back plate and the top plate of the magnet,
allowing heated air from the voice coil and gap to be channeled away and dissipated by the
chassis basket. Due to the increasing use of audio systems at outdoor events, the ability to
perform in adverse weather conditions or in high-humidity areas is an essential feature of the
12W700. This has been achieved using an exclusive cone and magnet plate treatment process
which increases resistance to corrosion and renders the cone water repellent.
Models
Model
0221284210
Code
0221284210
Information
8 Ohm
12W700
LF Ferrite Transducer
General Specifications
Nominal Diameter
Rated Impedance
AES Power
Program Power
Peak Power
Sensitivity
Frequency Range
Power Compression @-10dB
Power Compression @-3dB
Max Recomm. Frequency
Recomm. Enclosure Volume
Minimum Impedance
Max Peak To Peak Excursion
Voice Coil Diameter
Voice Coil Winding Material
Suspension
Cone
300 mm (12 in)
8 Ohm
450 W
700 W
1500 W
98 dB
55 ÷ 4200 Hz
0,8 dB
2,3 dB
1700 Hz
40 ÷ 90 lt. (1,41 ÷ 3,18 cuft)
7 Ohm at 25°C
34 mm (1,34 in)
75 mm (3 in)
aluminum
Triple Roll, Polycotton
Ribbed Curvilinear, Paper
FREQUENCY RESPONSE CURVE OF 12W700 MADE ON 50 LIT. ENCLOSURE TUNED 60HZ IN
FREE FIELD (4PI) ENVIRONMENT. ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE THIN
LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE
Thiele Small Parameters
Fs
Re
Sd
Qms
Qes
Qts
Vas
Mms
BL
Linear Mathematical Xmax
Le (1kHz)
Ref. Efficiency 1W@1m (half space)
58 Hz
5,7 Ohm
0,0531 sq.mt. (82,31 sq.in.)
3,93
0,37
0,36
55 lt. (1,94 cuft)
51 gr. (0,11 lb)
17,7 Tm
± 6,5 mm (± 0,26 in)
1,48 mH
97,2 dB
Mounting information
Overall diameter
N. of mounting holes and bolt
Mounting holes diameter
Bolt circle diameter
Front mount baffle cutout ø
Rear mount baffle cutout ø
Total depth
Flange and gasket thickness
Net weight
Shipping weight
CardBoard Packaging dimensions
315 mm (12,4 in)
8
7,15 mm (0,28 in)
296 - 300 mm (11,65 - 11,8 in)
282 mm (11,1 in)
282 mm (11,1 in)
147,5 mm (5,80 in)
16,5 mm (0,65 in)
8,2 kg (18,1 lb)
9 kg (19,87 lb)
332 x 332 x 184 mm (13,07 x 13,07 x 7,24 in)
FREE AIR IMPEDANCE MAGNITUDE CURVE
Notes
1) AES power is determined according to AES2-1984 (r2003) standard
2) Continuous power rating is measured in 50 lit enclosure tuned 60Hz using a 40 - 400Hz band
limited pink noise test signal with 50% duty cycle, applied for 2 hours.
3) The peak power rating represents the maximum permitted instantaneous peak power level
over a maximum period of 10ms which will be withstood by the loudspeaker without damage.
4) Sensitivity represents the averaged value of acoustic output as measured on the forward
central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave
test signal swept between 100Hz and 500Hz with the test specimen mounted in the same
enclosure as given for (1) above.
5) Frequency range is given as the band of frequencies delineated by the lower and upper limits
where the output level drops by 10 dB below the rated sensitivity in half space environment.
6) Power compression represents the loss of sensitivity for the specified power, measured from
50-500 Hz, after a 5 min pink noise preconditioning test at the specified power.
7) Linear Math. Xmax is calculated as (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the
gap depth.
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