Dont be concerned about power but quality of music from the speaker
assuming breeze is 8 ohms and you got 8 volts at 8 watts
thats alot of power,especially with classical music
silence is king here
Being familiar with the setup it doesn't surprise me at all that the low power SET just doesn't do it, especially when you're used to hearing it through speakers with nearly 10dB higher sensitivity. That's like having a 90W amp driving the Breeze vs the SET and the JBLs.
With demanding music, like classical, there's a very wide dynamic range required of the system in order to hear the quiet passages above the background while rendering the peaks without strain. With only 9W available, peaks with the Breeze will only reach an instantaneous SPL in the mid 90s. If the recording is a good one, the peak to average ratios will easily exceed 10:1 leaving an average listening level of only mid 80dB, and if you're sitting a few meters away, maybe even less than 80dB. That might be a bit on the low side for some folks. But if its late at night, and the furnace isn't running and the kids are sleeping and the ambient levels in the house are 10dB or more lower than during the day, I'd wager that the SET and Breeze would do an admirable job of delivering that late night relaxing audio massage.