To :jackd:
Thank you for the reply; I seriously considered the NuPrime ST-10 and actually put a "wanted" ad on U.S.Audio Mart, but received no replies I also checked Audiogon almost every day for one...No dice. So after months with music, I decided to buy the S-300.
I may inquire with .on-line dealers about a trade-in toward an ST-10. To its credit,, the S-300 has great dynamics and tight bass; but, the sound gets less somewhat tangled with less resolution, and as I said before, becomes edgy Fortunately, I got a good deal on the S-300 which though used looks mint.
S.J.