Well thanks everyone. As a result of your advice. I have been told that a Headphone amp with MacIntosh type sound is around the corner. So soon I shall find out if earplugs can do it. Originally I was using the headphone out on the computer as a source.
To try added amplification I tried:
Computer> analog> receiver> earphone
This was not much different. So I moved the DAC conversion away from the computer, ahead to the...