Ditching the preamp may, but certainly is not, an assurance of superior sound. Soundstage and tonality may suffer without a preamp.
Please?
I'd like to hear any technical reasons you have for this statement, if the output/input impedance is fine between source and amp (which they usually are these days).
And the source has enough output to drive the amp to full power (which they usually have these days) even too much.
Cheers George