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The D.A.S. 18G is a high efficiency 18” diameter cone loudspeaker with 4” diameter voice coil. It features C.A.F. (Controlled Air Flow), which conjugates centre pole piece and side slot convection cooling to provide high power handling and low power compression.
Exclusive curing techniques are utilized to create an indestructible bond between the copper voice coil and its fibre-glass based support. The computer designed injected aluminium basket supplies rigidity and mechanical grounding. A double spider configuration is used for excursion control at high power levels.
Applications :
Woofer. Suitable for high power direct radiation and horn loaded low frequency enclosures.
Features :
» Low frequency 18” cone loudspeaker
» 1400 W program power handling
» 4” voice coil
» Ceramic magnetic structure
» Centre pole piece and side slot convection cooling (C.A.F.)
Caractéristiques :
AES RMS (Average) Power HandlingR: 700 W
Program Power HandlingP: 1400 W
Peak Power HandlingK: 2800 W
Sensitivity: 99 dB SPL, 1W/1m
Nominal Impedance: 8 Ω
Nominal Frequency Range: 30 Hz - 2 kHz
Voice Coil: Cu, edgewound
Voice Coil Diameter: 102 mm (4 in)
Cooling: C.A.F. (Controlled Air Flow), pole piece and side slot convection
Frame: Cast aluminium
Spider: Double
Diaphragm: Curved
Magnetics: Anisotropic Barium Ferrite
Flux Density: 1.13 T
Input Connection: Push terminals, 4 mm diameter
Polarity: Positive voltage to red terminal moves diaphragm forward
Recommended Baffle Cutout Diameter: 415 mm
Weight: 11.6 kg, (25.4 lbs)
Shipping Weight: 13 kg, (28.6 lbs)
Thiele-Small Parameters :
Small Signal :
Fs: 32 Hz
Qts: 0.296
Qes: 0.31
Qms: 6.409
ηo: 3.44 %
Vas: 343 litres
Re: 6.2 Ω
SD: 0.1164 m2
(Preconditioning : 1 hour, AES power test at -3dB rated power)
Large Signal :
Xmax: 6 mm (0-pk)XM
VD: 0.6984 dm3 (0-pk)
XM
Calculated as (Hvc-Hag)/2+Hag/4
Additional data :
Effective piston diameter: 385 mm
Mms: 140 gr
Cms: 178 m m/N
Voice coil diameter: 102 mm
Voice coil winding depth, Hvc: 16 mm
Voice coil length: 30.4 m
Top plate thickness at voice coil, Hag: 8 mm
Displacement limit: 24 mm (pk-pk)
Minimum impedance: 6.5 Ω at 178 Hz
BL: 23.7 T.m
Spider suspension: polycotton
Surround suspension: polycotton
Voice coil support: GFRP (glass fibre reinforced polymer)
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