Harmonic distortion
Left channel selected
Groove Scope measurement · GS-2026-0007
Goldring 2100
Micro Seiki DQX-500 / Audio Research SP20 / EVO4
A measured view of rotational behaviour, channel performance and harmonic structure in one documented analogue playback chain.
Measurement at a glance
The primary record
Values are transcribed from the preserved Groove Scope PDF. Together they form a capture-specific view of primary performance and supporting channel behaviour.
- Playback RPM
- 33.33 Under stylus load
- Speed error
- −0.01% vs 33 1/3 RPM
- DIN-shaped W&F
- 0.032% RMS
- Channel balance
- −0.54 dB L−R
- Avg separation
- 20.1 dB 1 kHz electrical crosstalk
Rotation fingerprints
Four dimensions, two channels
Each view combines the angular heatmap and robust median profile produced by Groove Scope. Choose L or R independently on each card. The supplied plots are preserved without retouching; L/R assignment follows their supplied pair order. The PDF describes the 22:17 capture.
Opposite-channel leakage
Left channel selected
1 kHz level modulation
Left channel selected
Speed deviation
Left channel selected
On smaller screens, swipe horizontally to compare all four cards. The source views show eight consecutive rotations (R1–R8) where supplied.
Behind the measurement
A later DQX-500 capture
This 22:17 reference check follows a 1 kHz tone through playback speed, level, leakage and harmonic distortion. The supplied fingerprints show eight consecutive rotations and a recurring broad speed rise and fall. The source PDF leaves the input field blank; the measurer subsequently confirmed the Goldring 2100, Audio Research SP20 and EVO4.
What stands out
Near-nominal speed; repeat the harmonic check
The 22:17 Micro Seiki DQX-500 capture measured 33.33 RPM (−0.01%) with 0.032% DIN-shaped wow and flutter RMS. Average separation was 20.1 dB at 1 kHz and channel balance was −0.54 dB. THD was 1.72% left and 2.15% right. The report recommends a repeat because the right-channel third harmonic changed most during recording.
Directional crosstalk was −21.6 dB L→R and −18.6 dB R→L. The angular plots do not establish a physical cause for the patterns.
Measurement chain
What is verified
The measurer confirmed the playback chain after supplying the report. The PDF itself leaves the input field blank.
- Turntable
- Micro Seiki DQX-500
- Cartridge
- Goldring 2100
- Preamplifier
- Audio Research SP20
- Audio interface
- EVO4
Open technical record
Behind the playback chain
The editorial review connects directly to the source report, structured record, checksums, measurement method and original asset archive.
Measurement results
The complete capture, in numbers
Every reported numeric result in one place: playback speed, weighted and raw stability, channel behaviour, distortion and the second through fifth harmonics.
| Metric | Measured result |
|---|---|
| Playback speed under stylus load | 33.33 RPM |
| Playback speed error | −0.01% vs 33⅓ RPM |
| Settled speed range | 33.24–33.42 RPM |
| Settled speed span | 0.18 RPM |
| DIN-shaped wow & flutter RMS | 0.032% |
| Raw speed variation RMS | ±0.169% |
| Raw speed variation, 2-sigma | ±0.338% |
| Raw wow RMS | 0.163% |
| Raw flutter RMS | 0.040% |
| Channel balance, L−R | −0.54 dB |
| Average channel separation at 1 kHz | 20.1 dB |
| Electrical crosstalk, L→R | −21.6 dB |
| Electrical crosstalk, R→L | −18.6 dB |
| Crosstalk directional difference | 2.95 dB |
| Total harmonic distortion | Left 1.72%; right 2.15% |
| THD difference, L−R | −0.43 percentage points (source report) |
| Second harmonic (H2) | Left −35.4 dB; right −33.4 dB |
| Third harmonic (H3) | Left −54.7 dB; right −59.1 dB |
| Fourth harmonic (H4) | Left −71.6 dB; right −61.6 dB |
| Fifth harmonic (H5) | Left −74.9 dB; right −69.4 dB |
| H2 difference summary | Right 2.0 dB higher (source report) |
| H3 difference summary | Left 4.4 dB higher (source report) |
| Harmonic reliability | Right-channel H3 changed most; repeat before setup changes. |
Unweighted results complement the DIN-shaped measurement. The report advises a repeat because the right-channel third harmonic changed most during recording. Reported differences retain the source precision; they may differ from subtraction of rounded channel values.