L-Acoustics dV-DOSC, Operator'S Manual

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dV-DOSC dV-SUB Manual V3.0 June 2005
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1.4 dV-SUB ENCLOSURE DESCRIPTION
Figure 20: dV-SUB
dV-SUB contains three 15'' loudspeakers mounted in a vented bandpass configuration. Individual 15''
loudspeakers are rated at 8 ohms and connected in parallel to provide a nominal impedance of 2.7
ohms.
Note: The two side firing 15'' components are wired internally in polarity opposition so that a positive signal
causes cone movement in the same direction for all components, i.e., a positive pulse causes all 15''
components to pressurize the central chamber, resulting in positive polarity as measured acoustically. When
servicing 15'' components, 1:1 correspondence in terms of wiring should be followed, i.e., red lead -> red
terminal, black lead -> black terminal since the polarity inversion for the side 15'' components is taken care
of at the input terminal (not at the speakers).
The dV-SUB operating bandwidth is 40 Hz to 200 Hz with a useable bandwidth of 35 to 200 Hz
measured under half space loading conditions. The 15'' components employed in dV-SUB feature front
and rear treatment of the cone body and all metal parts are corrosion-treated to ensure weather
resistant protection. Other features include: high strength/low fatigue surround, 3'' edgewound
copper ribbon voice coil, die cast aluminum basket, massive vented magnet structure and high thermal
capacity.
A single Speakon connector socket is provided for connection to the amplifier in order to avoid
paralleling of multiple enclosures and subsequent reductions in overall load impedance. dV-SUB
cabling is compatible with all existing SB218 subwoofer cabling and sub cable DOSUB (8 pin CACOM
to 4 x Speakon) with, or without, sub extension DO10P can be used for connecting dV-SUB to the
amplifier racks.