I just installed the NOAM NUTV5 2 speaker system on my P500 (I opted to hold off on the sub right now and was told it would soon be available separately, but it is quite large and not sure where to mount it).
I took it down the road last night and it sounded pretty good with the speakers mounted on the diagonal bars just above head rest.
While this system doesn't provide a thumping bass it is quite loud and clear and maybe a little fuller sound with the passive 3" radiator than a straight speaker? From a 15 minute drive, I think I'll be happy with this system.
As of right now, NOAM does not offer clamps for either the main ROPS bars of 1-5/8" diameter or the smaller 1-3/8" diagonal bars. What I did was to cut a short piece of 1-1/4" SCH 40 PVC (1.38" ID, 1.66" OD) and split lengthwise and fits over the diagonal bar. I then took same length piece of 1-1/2" SCH 40 (1.61" ID, 1.90" OD) and split lengthwise fitting over previous PVC collar with splits 90 degrees to the 1-1/4" pipe. I think this is a much more secure method than just using tape. BTW, if mounting on 1-5/8" diameter bars you only need to use the 1-1/2" SCH 40.
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Amp mounted under hood high and dry - wires need to be cleaned up a bit in this photo.
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Dash control flush mounted - 3.5mm audio jack barely visible in lower left
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Close up of PVC bar spacers
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Rear view
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Speaker view from front
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View from drivers door