BX30 Owner’s Manual
BX30 Placement
Single Unit (Stereo)
The correct location and phase alignment of the BX30 is essential to achieve accurate performance with any given system. The best results are usually achieved with the BX30 floor standing and at the same distance from the listening position as the main speakers. The unit should be placed at the centre point of a line between the main speakers if used as part of a stereo system. The polarity and phase can be adjusted so that there is the maximum cut in bass at 95 Hz when the unit is switched ‘out of phase’. This should ensure the optimum coupling with the main speakers when ‘in phase’.
Double Units (Stereo)
The optimum stereo performance will be achieved with one BX30 directly beneath each main speaker. This will ensure correct panning and image location of signals when mixing. If performance is affected by the presence of a solid console or equipment furniture, it may be necessary to place the BX30 units at the same level as the main speakers in which case suitable, mechanically adequate stands should be employed. In any event the BX30s should always be placed equidistant to the mixing position in order to avoid phase cancellations.
Single Low Frequency Effects Channel (.1)
In this mode the BX30 will reproduce only the low frequency content of a discrete multi channel format and the positioning is usually asymmetrical to the room. This is done to avoid direct coupling to standing waves which results in better frequency response. The internal filter should be set to 120 Hz for film mixing or as required by the medium being used. Several BX30 units may be daisy chained using the input and output XLR connectors.
Large Active Systems
The BX30 can be used as part of a large sound system to handle bass frequencies up to 120 Hz. The phase adjustment allows combination with any mid range device and the integrated signal and power management makes the BX30 suitable for club and sound system installations. It is also suitable for mobile use but it should not be used outdoors or anywhere prone to damp or moisture, for electrical safety reasons.
The cabinet is designed for free standing or stand mounting; flying or rigging will require a suitable cradle or full supporting bracket. No fixing should be made directly to the MDF panels or rear electronics panel.
Cooling
The BX30 has full logic thermal control, which will shut the amplifier down in the event of the inner heat sink reaching 60 degrees Celsius. Always allow sufficient air flow, around the rear panel, especially if the unit is mounted in a front wall baffle or similar enclosure.
Under normal circumstances the BX30 should not be mounted with the heat sink fins horizontal, as this will impede convection cooling.
Mounting
Under some conditions it may be desirable to place the BX30 on anti vibration mounts so as avoid direct transmission to a floor or shelf unit. Special damping units may be ordered from your dynaudio acoustics agent who will facilitate this without compromising bass performance. Placing the unit on soft foam or carpet may reduce audible buzzing or vibration.
The design of the amplifier lead to the possibility of rotating the amplifier to horizontal or vertical. Disconnect the BX30, then remove the eight fixing screws. Lift the amplifier carefully out of the mounting hole. Then rotate it in the direction which suits you. Place it again and mount the eight fixing screws.
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