Do All Preamps and Converters Sound the Same? The Engineering Truth About Jim Lill's Test
- VDSS Studio
- 3 hours ago
- 3 min read
YouTuber Jim Lill's recent video has rocked the global audio community.
With exceptional editing and a series of obsessive tests, Jim set out to prove a provocative thesis: a common entry-level sound card and a preamp and conversion chain costing thousands of euros can sound identical.
Looking at the graphs and spectrum analyzers shown in the video, the result seems irrefutable. Yet, listening carefully to the files, the difference in transients and depth is clear.
The question then is not "who is right?", but rather: why do such electronically different machines produce identical graphs but different auditory sensations?
Here's a technical breakdown of what visual tests miss, and why upgrading your hardware still makes a difference.
The Basic Error: Forcing Different Systems to Behave Alike
Let's take a high-end converter, like an Apogee Symphony, and compare it to the built-in converters on a consumer card.
The first limitation of the test is calibration.
On professional machines, it's possible to calibrate the headroom, for example by setting -16 dBFS (or -18 dBFS) to be equivalent to 0 analog VU. On entry-level cards, this level is fixed and limited.
To make the two systems similar in a laboratory test, the tester is forced to "castrate" the more expensive system, lowering its input level so as not to clip the cheaper converter.
Furthermore, we're comparing incomparable circuits: an entry-level discrete preamplifier versus a preamplifier with input and output transformers (Neve-style).
Claiming that they give the same result is like using a broken scale to weigh a proton and an electron and, seeing that the needle does not move, deducing that they have the same mass.
Timing Behavior: Transformers and Clocks
When the signal passes through a real analog transformer (or a quality hardware clone, like a Warm Audio one), not only static equalization occurs. The transformer core becomes magnetically saturated.
This introduces a physical response time and release time that alters transient behavior, even at low volumes and without pushing the preamp hard.
Added to this is the problem of digital clock (jitter).
Converters aren't judged solely by how they "color" the sound, but by the precision with which they scan the famous 44,100 samples per second. A cheap clock will have inconsistent time intervals between one sample and the next.
The result? A sound that the ear immediately perceives as more "fake," two-dimensional, and plasticky.
The Results of Listening (Against the Screen)
To demonstrate this concept, I ran a test using a complex audio file (a beat with massive subs and fast treble transients), running it through the preamps and converters of a Scarlett 18i8 , and then through a Warm Audio 273 connected to an Apogee Symphony.
When analyzing the resulting files in Sonic Visualizer or using AI, the spectrogram graphs appear literally identical pixel for pixel. But during blind testing, the discrepancy is obvious:
On the Scarlett: The kick drum sounds "underwater," collapsing into the sub-bass frequencies with every hit. The snare becomes more nasal and snappy in an annoying mid-high range.
On the Warm Audio + Symphony chain: The stereo image widens dramatically. The reverb and sustain (depth of field) are intelligible. The snare's mid-highs are smooth and musical, while maintaining exceptional physical impact.
The 5% Rule and Workflow
Let's be clear: today it's absolutely possible to produce a worldwide hit with a €200 sound card and a pair of headphones.
It's not expensive hardware that writes good songs.
However, when upgrading from a €200 setup to a €2,000 setup, the mistake is to expect a proportional (10x) improvement. The actual improvement is around 5%.
But that 5% is crucial. When we add that 5% of sharper transients, three-dimensionality, and musical harmonic distortion across 50 or 100 tracks at the mix stage, the final difference between an amateur product and a gigantic, definitive-sounding record becomes unbridgeable.
Professionals spend thousands of euros to ensure that margin of technical safety, not to please a graphic designer on a screen.
If you want to hear the test files for yourself and draw your own conclusions, check out the full analysis video below.
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If you've recorded your songs in your home studio and are looking for that 5% difference that turns a track into a market-ready hit, we at VDSS Studio can help.
We offer online mixing and mastering services with attention to every technical detail.
We leverage mastering-grade converters (like our Apogee Symphony), dedicated analog outboard gear, and surgical listening to give your music the impact, stereo width, and competitive volume it deserves, without ever sounding fake or plasticky.
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