{ "$schema": "../../data/schema/measurement.schema.json", "schema_version": "1.0.0", "language": "en", "creator": { "name": "Michelangelo Canonico", "role": "Creator and lead measurer", "affiliation": "Direct Sound Records" }, "publisher": { "name": "Direct Sound Records", "url": "https://directsoundrecords.com/", "location_label": "London–Rome" }, "software": { "name": "Groove Scope", "report_generator_label": "Groove Scope Reference", "application_version": "not_recorded", "analysis_method_version": "not_recorded", "platform": "not_recorded", "developer": "Michelangelo Canonico / Direct Sound Records" }, "related_applications": [ { "name": "Resonance Lab", "relationship": "Companion application for tonearm and cartridge resonance planning", "url": "https://directsoundrecords.com/resonance-lab/" } ], "measurement_type": "1 kHz Reference Check", "measurement_scope": [ "playback speed", "rotational stability", "DIN-shaped wow and flutter", "channel balance", "electrical crosstalk", "distortion diagnostics", "harmonic profile", "rotation fingerprints" ], "license": "CC-BY-4.0", "measurement_id": "GS-2026-0007", "record_version": "0.9.2", "publication_status": "draft", "title": "Goldring 2100 — Micro Seiki DQX-500 — 1 kHz Reference Check", "source_report_title": "1 kHz Reference Check", "slug": "gs-2026-0007-goldring-2100-micro-seiki-dqx-500-1-khz-reference-check", "measurement_datetime_local": "2026-10-01T22:17:00", "measurement_timezone": "not_recorded", "date_published": "2026-10-02", "sample_id": "not_recorded", "setup": { "turntable": "Micro Seiki DQX-500", "tonearm": "not_recorded", "cartridge": "Goldring 2100", "stylus": "not_recorded", "cartridge_hours": "not_recorded", "vertical_tracking_force_g": "not_recorded", "anti_skate_setting": "not_recorded", "alignment_geometry": "not_recorded", "azimuth_setting": "not_recorded", "vta_or_sra_setting": "not_recorded", "phono_stage": "Audio Research SP20", "phono_gain_db": "not_recorded", "cartridge_loading": "not_recorded", "test_record": "not_recorded", "test_record_track": "not_recorded", "test_record_condition": "not_recorded", "nominal_test_tone_hz": 1000, "audio_interface_reported_label": "not_recorded", "audio_interface_full_model": "EVO4", "interface_gain_settings": "not_recorded", "sample_rate_hz": "not_recorded", "bit_depth": "not_recorded", "capture_device": "not_recorded", "channel_routing": "not_recorded", "measurement_location": "not_recorded" }, "results": { "playback_rpm": { "value": 33.33, "classification": "primary", "condition": "under_stylus_load" }, "playback_speed_error_percent": { "value": -0.01, "classification": "primary", "direction": "slow" }, "settled_rpm": { "minimum": 33.24, "maximum": 33.42, "span": 0.18, "classification": "primary" }, "din_shaped_wow_flutter_percent": { "value": 0.032, "classification": "primary" }, "raw_speed_variation_percent": { "rms_plus_minus": 0.169, "two_sigma_plus_minus": 0.338, "classification": "unweighted_diagnostic" }, "raw_wow_flutter_percent": { "wow_rms": 0.163, "flutter_rms": 0.04, "classification": "unweighted_diagnostic" }, "channel_balance_db": { "value": -0.54, "classification": "diagnostic_only" }, "crosstalk_1khz_db": { "average_separation": 20.1, "left_to_right": -21.6, "right_to_left": -18.6, "directional_difference": 2.95, "classification": "supporting" }, "thd_percent": { "left": 1.72, "right": 2.15, "left_minus_right_percentage_points": -0.43, "classification": "diagnostic" }, "harmonic_profile_db": { "h2": { "left": -35.4, "right": -33.4 }, "h3": { "left": -54.7, "right": -59.1 }, "h4": { "left": -71.6, "right": -61.6 }, "h5": { "left": -74.9, "right": -69.4 }, "classification": "diagnostic" }, "harmonic_difference_summary_db": { "h2_right_higher": 2.0, "h3_left_higher": 4.4, "classification": "source_report_summary" }, "harmonic_reliability": { "classification": "repeat_before_setup_change", "quality_note": "The right channel's third harmonic changed most during recording. Repeat before changing the cartridge setup." } }, "interpretation": { "summary": "The DQX-500 capture averaged 33.33 RPM (−0.01%) with 0.032% DIN-shaped wow and flutter. Average 1 kHz separation was 20.1 dB and channel balance was −0.54 dB. The right-channel third harmonic changed most during recording, so the report advises repeating the capture before adjusting the cartridge setup.", "recommendation": "Repeat before changing cartridge setup, as the report advises. Document the remaining tonearm, test-record and capture settings to support comparison.", "repeat_required": true }, "provenance": { "source_type": "Groove Scope generated PDF report", "source_file": "report.pdf", "data_entry_method": "Values transcribed verbatim from the original PDF report; rounded differences are preserved rather than recalculated.", "raw_audio_published": false, "raw_audio_note": "No raw test-record audio is included.", "sample_ownership": "not_recorded", "setup_metadata_source": "The PDF does not name the turntable or cartridge and leaves the input field blank. The measurer identified the playback chain in conversation as Micro Seiki DQX-500, Goldring 2100, Audio Research SP20 and EVO4. The illustrative hero was based on a previously supplied photograph of this turntable and cartridge.", "known_limitations": [ "The PDF has a blank input field and does not identify the turntable or cartridge. Micro Seiki DQX-500, Goldring 2100, Audio Research SP20 and EVO4 were subsequently confirmed by the measurer.", "The hero photograph predates this capture and is illustrative rather than capture-specific evidence.", "Tonearm, stylus, loading, tracking force, alignment, anti-skate, test-record identity and track, capture settings, software versions, timezone and repeat count were not supplied.", "The right-channel third harmonic varied during this recording; repeat before changing cartridge setup, as the source report states.", "Reported differences retain source precision and may differ from subtraction of rounded channel values." ], "fingerprint_channel_assignment": "L/R labels follow the order of the two screenshots supplied for each metric; the screenshots themselves do not display channel labels.", "photo_treatment": "The previously retouched DQX-500 and Goldring 2100 hero is reused as an illustrative equipment image. Original HEIC preserved. Fingerprint source PNGs are unedited; WebP copies are format conversions for web display." }, "files": { "human_readable_record": "README.md", "source_report": "report.pdf", "checksums": "checksums.sha256", "source_hero": "assets/source/hero-original.heic", "rotation_fingerprints": [ "assets/source/speed-deviation-left.png", "assets/source/speed-deviation-right.png", "assets/source/level-modulation-left.png", "assets/source/level-modulation-right.png", "assets/source/opposite-channel-leakage-left.png", "assets/source/opposite-channel-leakage-right.png", "assets/source/harmonic-distortion-left.png", "assets/source/harmonic-distortion-right.png" ], "retouched_hero": "assets/hero-retouched.png", "image_edit_prompt": "assets/image-edit-prompt.txt" }, "keywords": [ "Groove Scope", "Direct Sound Records", "Michelangelo Canonico", "Micro Seiki", "vinyl measurement", "rotation fingerprint", "wow and flutter", "cartridge crosstalk", "Micro Seiki DQX-500", "Goldring 2100", "Audio Research SP20", "EVO4" ] }