Eliminated my preamp with amazing results

Being there done that. I played my Cary Audio 303/200 CDP directly connected to the Mark Levinson 23.5 via RCA connectors. Used the built-in digital volume control to adjust the volume. At first, music sounded immediate, up front with "better" dynamics, or at least I thought so. However, after listening for 2-3 hours, listening fatigue set in. On a different day, I tried the same exercise, but using VTL TL 2.5 preamp in the chain. This is a tube preamp with 2x12AU7 and 2x12AT7s.

Difference was immediately noticeable. Sound was laid back with much more realistic voices and even better bass! I noticed the soundstage was wider and deeper with the preamp. Without the preamp, music sounded immediate. As a result, the front layer contributed more to the total experience whereas rest of the soundstage contributed less. With the preamp, almost every layer appeared to contribute to the total experience.

I can understand the appeal of immediate impact of the sound without a preamp that gives you a near-field experience or a "headphone" effect even though you are seated outside of the near-field listening area. If this is your cup of tea, then I am very happy for you. But hang on to that preamp for a little bit longer :)

@kraftwerkturbo 

So PC-software-DAC-amp brings up the question: what software/volume control to use to play PC files. I only experiemented to simply find the volume control/software that allows the highest output (amp input not sensitive enough). Didn't consider quality (and haven't concluded yet on easy of use regarding software choice). 

Paul McGowen (PS Audio) got me started on this whole idea. He pointed out how a volume control is a restrictive device. Restricts resolution. Like putting on the brakes in a car. He said you should get the volume knob as high as possible so it does as little damage as possible. He said he likes the volume knob UP around 2 to 3 o'clock position. He said the higher volume position has a "HUGE" impact on the resolution/sound. 

How the heck can you accomplish this volume position? This led me to use the Audirvana software using a 64 bit high quality controller(Roon also). This allowed a higher position on the preamp volume knob BUT now I was using two volume controllers. So now... lets eliminate one. Get rid of the worst and use the best and most simple. 

It's possible that the reason a straight DAC sounds better than a passive preamp is the complete elimination of the restrictive volume control.

I also think people are fooled when they hear a preamp that has a boosted gain. The more dynamic sound is immediately noticeable but at what cost? 

I experimented with a Melos tube preamp that adds 20db of line gain !!! Had a big sound with plenty of dynamics. "A fun sound". "Big and Blowsey" (as per stereophile) Couldn't get the volume knob up past 9 o'clock. Way too loud. Having high resolution music source then restricting the resolution with the volume knob seemed counterproductive. 

FYI... higher end preamps use better quality 'digital volume controllers' or 'stepped attenuators' to deal with this problem. 

I had the opposite results when adding a preamp between my DAC and amplifier. Adding the preamp greatly improved the dynamics and the imaging. I have an older Audio Alchemy DDE v3.0 DAC and a Acoustat TNT120 amplifier with Kef Uni-Q’s. I put in a Klyne Audio Arts preamp and was astonished at the improvements.

I'm shocked that  you guys with difficult to drive speakers and low gain/low input impedance amps find an active preamp to sound better. Shocked, I say!

No offense but I think we are repeating the story telling of the parable of blind men and an elephant.  According to Wikipedia, the moral of the parable is that "humans have a tendency to claim absolute truth based on their limited, subjective experience as they ignore other people's limited, subjective experiences which may be equally true." 

For me, understanding the intricate elements inside a preamp and how they synergize with other components remains a puzzle. Waiting for a knowledgeable person to shed light on what truly enhances the system's sound quality. Mr. Paul McGowan discussed the concept of 'separation' between the source and amplifier, speculating its impact. Additionally, he mentioned the potential benefits of negative feedback in enhancing linearity and distortion performance.