JBL MPA1100 Owner's Manual

Contents

JBL MPA1100 Owner's Manual Manual pdf 4 page image

3The MPA275, MPA400, MPA600, MPA750 and MPA1100 are high-efficiency profession-al power amplifiers, with two independent channels, respectively capable of deliver-ing 275, 400, 600, 750 and 1100 watts into a four ohm load (per channel), andsubstantially more power into lower impedance loads. Semi-toroidal power trans-formers (one per channel in the MPA750 and MPA1100) are mounted in each frontcorner, as close as possible to the rack ears and rails. The rear panels are 16.9 inchesbehind the front mounting plane, so an extra rack depth allowance (i.e., more than18 inches) will be needed to clear XLR or Speakon connections. The built-in fancooling takes air in the rear, exhausting through front vents. Due to the flow-throughcooling, amplifiers may be racked with zero clearance in between, which also helpssupport the weight. Rear support within the rack must be used in portable applica-tions.Open Input Architecture™ SlotsProvided with each MPA Series amplifier is a standard input module. This moduleand the upper input cover panel can be removed, permitting future upgrades.Internally, a ribbon cable runs behind both of these “slots.” The ribbon cable con-nects to the rest of the amplifier and carries several levels of DC power, and (for eachchannel) the input signals, speaker output monitor, muting status, clip activity, ther-mal status, and power-on status. These signals are provided to support future remotecontrol and monitoring schemes as they become available. The JBL Marketing depart-ment will be happy to entertain suggestions for input modules.The “standard input board” which is shipped with each amplifier has balancedXLR and barrier strip inputs, bridging and input-parallel switches, and footprints forpassive rolloffs and popular input isolation transformers (more info is available onrequest).Unit DescriptionFigure 1. Open Input Architecture Slots.