Harmonic distortion
Left channel selected
Groove Scope measurement · GS-2026-0005
Empire 7000/III
Technics SL-1410 MK2 / ART USB Phono Plus
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
- 0.040% RMS
- Channel balance
- −0.26 dB L−R
- Avg separation
- 23.8 dB 1 kHz electrical crosstalk
Rotation fingerprints
Four dimensions, two channels
Each card pairs the supplied angular heatmap and robust median profile. Choose L or R to compare the two supplied views. The originals are preserved; channel assignment follows the supplied pair order.
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 the four cards. The source views show eight consecutive rotations (R1–R8).
Behind the measurement
A 1 kHz capture on the SL-1410 MK2
The Technics SL-1410 MK2 was measured with an Empire 7000/III and ART USB Phono Plus. The source report identifies neither tonearm nor test-record track, so this result describes the recorded chain only to that level of detail.
Eight rotation fingerprints show speed deviation, level modulation, opposite-channel leakage and harmonic distortion for both supplied channel views.
What stands out
Steady harmonics, with directional channel differences
The turntable averaged 33.33 RPM (−0.01%) with 0.040% DIN-shaped wow and flutter. Average separation was 23.8 dB; the report gives −24.9 dB L→R and −22.8 dB R→L. Channel balance was −0.26 dB, while THD was 2.26% left and 1.85% right.
Harmonic levels stayed steady within this recording. A repeat with the missing setup and track details recorded would show whether the directional and THD differences persist.
Measurement chain
What is verified
Verified components are shown in signal order on one continuous line. Components not used or not verified for a particular method remain absent.
- Turntable
- Technics SL-1410 MK2
- Cartridge
- Empire 7000/III
- Phono stage / USB interface
- ART USB Phono PlusCapture label: USB Audio CODEC
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 | 33.24–33.41 RPM |
| Settled speed span | 0.17 RPM |
| DIN-shaped wow & flutter RMS | 0.040% |
| Raw speed variation RMS | ±0.147% |
| Raw speed variation, 2-sigma | ±0.294% |
| Raw wow RMS | 0.139% |
| Raw flutter RMS | 0.046% |
| Channel balance, L−R | −0.26 dB |
| Average channel separation at 1 kHz | 23.8 dB |
| Electrical crosstalk, L→R | −24.9 dB |
| Electrical crosstalk, R→L | −22.8 dB |
| Crosstalk directional difference | 2.15 dB |
| Total harmonic distortion | Left 2.26%; right 1.85% |
| THD difference, L−R | +0.41 percentage points (source report) |
| Second harmonic (H2) | Left −33.0 dB; right −34.7 dB |
| Third harmonic (H3) | Left −49.4 dB; right −54.6 dB |
| Fourth harmonic (H4) | Left −63.0 dB; right −66.6 dB |
| Fifth harmonic (H5) | Left −71.1 dB; right −74.7 dB |
| H2 difference summary | Left 1.7 dB higher (source report) |
| H3 difference summary | Left 5.3 dB higher (source report) |
| Harmonic reliability | Steady during recording. Suitable for setup guidance. |
Unweighted results complement the DIN-shaped measurement. The report describes harmonic levels as steady during recording. Reported differences retain the source precision; they may differ from subtraction of rounded channel values.