Ohh no i dont have a hearing problem because i really like how two of neighbors speakers sound but i havent get the chance to ask them what kind of equipment they have.
Find out what speakers they have. The rest is not that important.
It is long odds that you receiver could be the problem, but it is a possibility and the fact that your neighbor's system sounds fine to you suggests it may be a possibility.
First check on something that was mentioned earlier.
Play your speakers at a moderate level, remove teh grills and put your ear at the tweeter to see if you hear anything coming from them. By your description of not getting enough treble no matter what, the tweeter may not be working.
If the tweeter makes little or no sound, look at where the speaker wires are connected. Do you see the metal pieces going from the lower to the upper terminals as shown in this image? If not, that is your problem.
If they are there, your speakers are likely damaged or defective in some way (it is strange for both to be)!