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You may have trouble finding an off the shelf plate amp that is as small as you desire. The one Rob mentioned will work if you don't mind the size. Personally I would much rather have passive front fills. Just running some NL4 is much easier than trying to carry power to each fill. If this must travel together as a package, just throw a small class D amp in the case too. Something like an iNuke 1000 DSP is only 8lbs and very shallow. This will also be significantly less expensive than trying to do plate amps for each fill.