Noise reduction from neighboring properties - ideas?

That unfortunately doesn't help with bass, it distributes spherically.

We had a whirlpool in the garden at the old house, a mixed-use area. The noise level was just below the allowed limit and was annoying the neighbors. The pump must circulate even at night, otherwise there will be slippery spots :) The specialist department of ...Bauknecht helped me, giving me advice. We lived in the area and at that time were a test family for the devices, so I had access to development.

Low tones do not carry as far as high tones, and sound waves tend to stop relatively easily at obstacles. Roughly speaking, where you cannot see, significantly less will reach you than at the place of origin. But where air can pass, sound will also pass. If you want to block low tones in this case, you need mass, i.e. a wall. Heavy and man-high.

It worked great for us; there were no more complaints. I’m keeping my fingers crossed for you! A wall also has the advantage that you can really use the inner property right up to the wall. Who would put a lounge chair right on the boundary line if there is visual contact? I believe "out of sight, out of mind" helps a little, too.

Good luck! Gabriele

That mainly takes place in my head, that's true. But that doesn’t solve my problem

So, if you treat your Metabo radio neighbor at least half as nicely as you do here, part of the problem is already solved. What goes on in your head can usually be resolved as well. For example, my wonderful wife often gets more annoyed by thoughtlessness itself than by what the thoughtless person causes, such as loud music. Interestingly, it makes a difference whether the thoughtless person is fundamentally unpleasant to her or if she actually likes this person. If it's similar for you, you don't need to invest in structural measures, because those would only eliminate the symptom—if they even work at all. If it's similar for you, it helps to find something you like and appreciate about your neighbors. Suddenly, the music isn’t so bad anymore, especially since it happens less often (see first sentence). Young children don’t care much about music; if they’re tired, they’ll fall asleep anyway. It’s different when they sense that the parents are frustrated; then they have a much harder time calming down. I wish you all the best in dealing with the situation.

yes, the best is always a solid wall, preferably also planted. but actually, such a radio should firstly not produce much absolute sound pressure, secondly not play particularly deep. that's why I suspect standing waves.

A Helmholtz resonator helps against standing waves. Cheaper and smarter than mass, which does not change a room’s geometry. Since the phenomenon does not only occur in one room, I think standing waves are rather unlikely here, unless the affected rooms have identical sizes.

Yes, I had also suggested that at the front. One room dimension being identical would be sufficient, which can indeed be the case in one half of a semi-detached house.