Why Does Vinyl Sound Worse Near the End of a Side?

What Inner-Groove Distortion Actually Sounds Like

The symptoms are familiar to any serious vinyl listener. As the stylus approaches the label, something changes. Cymbals that shimmered cleanly on the outer tracks begin to splash. Vocal consonants fragment into coarseness. Electric guitars lose separation and smear into a blurred mass. The stereo image — wide and stable at the beginning of the side — narrows and becomes unstable. Bass may lose definition. The overall sound becomes congested, harsh, or fatiguing in ways it was not three tracks earlier.

This degradation is not imagination. It is a physical consequence of the format's geometry — but its severity depends on an interaction of factors, not a single cause. Diagnosing which factors dominate in a specific case requires understanding why the inner groove is inherently more difficult, and then distinguishing that inherent difficulty from problems that can be corrected.

Why the Groove Becomes Harder to Reproduce

A vinyl record rotates at constant angular velocity — 33⅓ or 45 revolutions per minute regardless of where the stylus sits. But the circumference of the groove decreases as the stylus moves inward. The linear velocity — the actual speed at which groove passes beneath the stylus — falls proportionally with radius:

where v is linear velocity (m/s), r is groove radius (m), and N is rotational speed (rpm).

At 33⅓ rpm, the outermost groove (approximately 146mm radius) passes the stylus at about 0.51 m/s. Near the label (approximately 60mm radius), that velocity falls to roughly 0.21 m/s — less than half.

The consequence is that high-frequency information — which requires rapid changes in groove direction — must be packed into progressively shorter physical wavelengths as the side progresses. A 10kHz signal occupies approximately 51 micrometers of groove length at the outer edge but only 21 micrometers near the label. The stylus must negotiate increasingly tight, rapid modulations with less groove wall to trace against.

The outer groove (green) has over twice the linear velocity of the inner groove (red) at the same rotational speed.

This is not a defect. It is physics. Every 33⅓ rpm record experiences it. The question is not whether inner-groove tracing is more difficult, but whether a given playback system can manage that difficulty within acceptable limits.

Inherent Tracing Difficulty vs. Added Mistracking

This is the article's intellectual centerpiece — and the distinction most vinyl discussions fail to make clearly.

The first category is inherent to the format and varies with mastering, side length, and cutting level. The second category is correctable — or at minimum, diagnosable. Conflating the two leads to either endless futile adjustment (trying to fix a format limitation) or premature resignation (accepting mistracking as “just how records sound near the end”).

Why Stylus Profile Matters

Narrower scanning profiles trace shorter wavelengths more accurately — but demand more precise alignment.

Different stylus geometries present different contact areas to the groove wall. The relevant dimension is the scanning radius — how much groove wall the stylus “sees” in the direction of groove travel.

• Conical (spherical) — Broadest scanning radius. Least able to trace short-wavelength modulation, particularly at inner grooves. Most forgiving of alignment error. Lowest resolution.
• Elliptical — Narrower major/minor axis. Better high-frequency tracing than conical. More sensitive to alignment.
• Shibata / Line-contact — Very narrow scanning radius with extended vertical contact. Excellent inner-groove performance. Demands precise alignment, azimuth, and VTA.
• MicroLine / MicroRidge — Narrowest practical scanning dimension. Closest approximation to the cutting stylus geometry. Best inner-groove resolution. Most demanding of setup precision.

How Alignment Geometry Changes the Result

Simplified tracking-error distribution. Each geometry places its null points differently, trading outer-groove accuracy for inner-groove performance or vice versa.

A pivoted tonearm cannot maintain perfect tangency across the entire record. The cartridge is tangent to the groove at exactly two “null points” — everywhere else, some tracking-angle error exists. The three most common alignment geometries distribute that error differently:

• Baerwald — Minimizes the maximum tracking error across the full playing surface. Provides the most even distribution of distortion from outer to inner grooves. Generally the safest default for long-playing sides.
• Löfgren B — Places one null point closer to the inner groove, reducing error where tracing is most difficult. Slightly higher error at outer radii as a tradeoff.
• Stevenson — Places the inner null point at the innermost playable radius. Minimizes distortion at the very end of a side at the expense of higher error earlier. Less commonly recommended for general use.

No alignment geometry eliminates tracking error. They redistribute it. The choice should reflect the listener's priorities and the typical side lengths in their collection. For long sides with demanding inner-groove content, Löfgren B or Baerwald generally outperform Stevenson.

What the Mastering and Cutting Engineer Can Control

Inner-groove difficulty is not solely a playback problem. The cutting engineer has significant influence over how demanding the inner groove becomes:

• Side length — A 17-minute side at 33⅓ gives the stylus considerably more room than a 25-minute side. Shorter sides permit wider groove spacing and reduce inner-groove stress.
• Track sequencing — Placing quiet, less dynamic tracks near the end of a side and demanding material at the beginning is standard practice for vinyl mastering.
• Cutting level — Higher cutting levels produce larger groove excursions. At inner radii, excessive level can push modulation beyond what a playback stylus can track.
• High-frequency management — De-essing, gentle treble reduction, and careful sibilant control near the end of a side prevent the cutting lathe from inscribing modulations that most styli cannot follow.
• 45 RPM cutting — Doubling the rotational speed doubles the linear velocity at every radius. A 45 RPM side at 60mm radius achieves the same velocity as a 33⅓ side at approximately 81mm. This is why audiophile labels cut demanding material at 45 RPM across multiple discs.

How to Diagnose the Problem

The goal is to determine whether inner-groove degradation in your system represents inherent format behavior, a correctable setup problem, or damage to a specific record. The following comparisons isolate the variables:

When the Record Itself Is the Problem

Not every case of inner-groove distortion can be fixed by adjusting the turntable. Several conditions exist in the record itself:

• Groove wear from previous mistracking — A record played repeatedly with a worn or misaligned stylus may have permanently deformed groove walls at demanding inner passages. No setup adjustment can restore missing groove geometry.
• Aggressive cutting — Some lacquers were cut too hot, with insufficient de-essing or excessive level near the end of a long side. The modulation inscribed in the groove may exceed what any domestic playback stylus can trace without distortion.
• Manufacturing defects — Off-center pressing, contamination, or late-generation stamper wear can compound inner-groove stress.
• Long sides with dense content — A 28-minute side with loud rock music placed near the label is asking for trouble regardless of cutting quality. The physics simply do not cooperate.

In these cases, the correct diagnosis is not “my turntable needs more adjustment.” It is “this record, at this radius, with this content, exceeds what the format can deliver cleanly.” A transparent system reveals that limitation honestly. A less resolving system may obscure it — but obscuring a problem is not the same as solving it.

The Sonic Atlas Position

We run a Benz Micro Wood SM (line-contact stylus) aligned to Baerwald geometry on a VPI JMW 9″ unipivot arm. This combination provides excellent inner-groove performance on well-mastered pressings — but it does not eliminate inner-groove distortion entirely, because nothing can. The format has limits.

What our setup does is separate inherent tracing difficulty from correctable mistracking. When inner grooves sound clean on most records and distort only on specific passages of specific pressings, we know the system is working correctly and the issue is upstream — in the mastering, the cutting, or the condition of that particular copy.