Too much power?

Why bother to listen to a "system" at 70db, try a clock radio. I listen to music at the volume as recorded and meant to be heard.

When Vladimir Ashkenazy made a recording of Beethoven's piano sonata No. 28 in 1977 on a Steinway D, that is what I want to hear 45 years later in my room. Complete with his musical intent and it's necessary dynamics.

Ambitious audio is a manner of having a different but equal experience to hearing music in the flesh.

@dain your speakers are 86dB with nominal impedance 4 ohms. I haven't seen the impedance curve, but it may drop below 4 ohms at certain frequencies. This is a quasi-ribbon speaker and usually a demanding load for the amplifier. Your amp may not be up to the task of driving these to their full capabilities. I agree with @ditusa  that you need a more powerful amp to bring these to life. It is not about playing it loud. With a more powerful amp, you get better bass, imaging, spacing, and depth. Find a good SS amp that can deliver at least 200 W at 4 ohms and 400 W at 2 ohms. There are many good amps that can drive these speakers.

Regardless of what speakers you have, listening at moderate levels doesn't require a powerful amp at all. The dBs produced at one watt is the same no matter the amp. 

70 dB may be too low for good listening. I'm sure recordings are mastered at significantly higher levels than this. And our hearing response is level related. The lower the level the poorer our hearing at low and high frequencies(I seem to recall flat is at 100 dB). So if you listen at levels lower than the recording was mastered at, the level the mastering engineer set his sense of octave to octave balance, you're missing out on lows and highs and that probably results in the loss of excitement.

With ny one set of monoblocks  I changed speakers that were much harder to drive a d with the bigger load on the amp they system  came to life. The speaker needs to match the amp