Looking for Advice on a Preamplifier or Other Solution to Modify Sound

Hi

Looking for Advice on a Preamplifier or Other Solution to Modify Sound

I'm seeking recommendations for a preamplifier or any other solution to adjust the sound characteristics. I have a Dangerous Convert 2 connected to NEUMANN KH 420 speakers and would like the option to add warmth and fullness to the sound for certain music genres or CDs. Ideally, I'm looking for something that could bring a more visceral quality to the sound. Would a preamplifier be a good choice here, or are there other professional audio products—or even software, though it's a less preferred option—that could help achieve this effect?

Thanks in advance!