I will agree that the preamp shares some responsibility for bass response and dynamics, provided that the amp/speaker combination is also up to the task.
Of the several preamps I've owned, the Musical Fidelity A3cr comes closest to what you ask (although you're looking at preamps way out of the MF's price range).
Michael
Of the several preamps I've owned, the Musical Fidelity A3cr comes closest to what you ask (although you're looking at preamps way out of the MF's price range).
Michael