I have a baby with upgraded coupling caps. It was factory modded, so unfortunately I have nothing to compare it to, but it is a nice little amp for the money.
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Sophia Electric Baby Amplifier is a great sounding amplifier that will challenge many $10K amplifiers if you can live with 10W per channel x2.
The best upgrade for Baby Amplifier is to buy a second unit for bi-amplification. By using one Baby to drive tweeter and a second one to drive mid/bass, you will get as if 4x more drive capability in driving big speakers. The sound stage is amazingly deep and tall if you try it.
I agree with the above posts, the Baby is a very under-rated amp for the money. I have owned a couple of these, and upgrading the coupling caps provided a modest but noticeable difference in the sound. I found the biggest improvements were upgrading the RCA inputs and speaker posts and removing or bypassing the volume pot. These changes made a substantial improvement.
I did not try the horizontal bi-amplification route proposed above - I would ask Washington_highend_audio how they would propose to split the signal in such a scenario. Do they offer a preamp with dual amp outs? I think that it would be quite simple to reconfigure these amps as monoblocks and vertically bi-amp.