Hey Diapason,
Great to hear that the Mrs. is pregnant! Congratulations!
Infact, this is a great time to re-visit the hifi, believe me when the bubs in the tummy, play all sorts of music that you like. Bubs will start to take an instant liking to it as well, and then when she/he finally pops out, low and behold, they will actually like the music! Or better still they'll become either artistic or very creative in some form...
When my good wife was preggy, we used to sit on the sofa and listen until all were asleep, usually listening to Simon & Garfunkel, or Tracy Chapman or Nora Jones. On many nights it used to be Nat King Cole. Now my daughter is 13, plays the trombone and in her high school jazz mini-band, so there you go! Music is a very important part of family life, especially when it sounds great and everyone enjoys, it also helps the atmosphere to be more relaxing in the house, rather than tantrums and wailing kids...
Now, getting back to your system, it seems that you have identified the problem more or less with the speakers but for some reason I am wondering whether it is the speakers or not... I know for a fact that something is a mis-match. Perhaps just even speaker cable or interconnects could also be an issue. Even the AC plug point where your gear is plugged into could be faulty, and you're not getting the required current for the amps/speakers to open up. I had this problem once many years ago, and having a dedicated line fixed that!
Also cables and interconnects play an important role, some neutral types are way better than some fancy stuff available. I remember one chap having some very fancy Van Den Hulls that cost a bomb, sounded okay, until we tried Nordost (blue heaven) and blew the roof off! Apart from that the Nordost was just a fraction of the cost...
There are a number of factors to consider here, I would just start with the basics. System set up properly even if it has to be "near field" that's alright as long as the basic sonics are there! Then work your way round the components and finally onto cable/interconnect matching and AC power points. Could even be a voltage fluctuation problem within your circuit...
The other thing is, since your about to have a child within the next few months, perhaps just sit back and try to enjoy the music since your kid will not care on what type of system you have, as long as the music is good! Once you've shared this joy and realized where there is need for improvement, you would probably figure it out straight away!
When there is a brother in need for good music, not to worry help is on the way mate.
Cheers an all the best to bubs!
RJ