Just to update:
Those AudioBahn speakers work great. Now I think I am getting every penny out of the Nakamichi system.
If you are out to buy new speakers, be sure to look at the sensitivity rather than the max or peak power watts.
"In general a higher quality speaker will have a higher sensitivity rating, larger and or heavier magnet, and a higher Xmax.
It should be noted that a higher power driver will not necessarily be louder than a lower power one. For example a speaker that is 3 dB more efficient than another will produce double the SPL (or loudness) for the same power than the other. Thus a 100W speaker (A) rated at 92 dB/(W.m) efficiency will be double as loud as a 200W speaker ( B ) rated at 89 dB/(W.m) when both are driven with 100W of input power. For this particular example, when driven at 100W, speaker A will produce the same SPL or loudness that speaker B would produce with 200W input. Thus a 3 dB increase in efficiency of the speaker means that it will need half the power to achieve a given SPL, and this translates into a smaller power amplifier and some cost savings."