Paul @ PS Audio has a great explanation of why pre-amps are important, but also why it costs so much to create a pre-amp that does not add or subtract ...
https://www.youtube.com/watch?v=isQ48qn1CK8
In case, audiogon removes the link, you can go to youtube and search for the title 'Does anyone need a preamp?' by PS Audio.
https://www.youtube.com/watch?v=isQ48qn1CK8
In case, audiogon removes the link, you can go to youtube and search for the title 'Does anyone need a preamp?' by PS Audio.