{ "$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" ], "license": "CC-BY-4.0", "measurement_id": "GS-2026-0005", "record_version": "0.9.1", "publication_status": "draft", "title": "Technics SL-1410 MK2 / Empire 7000/III — 1 kHz Playback Check", "source_report_title": "Technics SL-1410MK2 - Empire 7000/III - ART USB phono plus", "slug": "gs-2026-0005-empire-7000-iii-technics-sl-1410-mk2-art-usb-phono-plus", "measurement_datetime_local": "2026-10-01T12:18:00", "measurement_timezone": "not_recorded", "date_published": "2026-10-01", "sample_id": "not_recorded", "setup": { "turntable": "Technics SL-1410 MK2", "tonearm": "not_recorded", "cartridge": "Empire 7000/III", "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": "ART USB Phono Plus", "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": "USB Audio CODEC", "audio_interface_full_model": "ART USB Phono Plus", "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": 33.41, "span": 0.17, "classification": "primary" }, "din_shaped_wow_flutter_percent": { "value": 0.04, "classification": "primary" }, "raw_speed_variation_percent": { "rms_plus_minus": 0.147, "two_sigma_plus_minus": 0.294, "classification": "unweighted_diagnostic" }, "raw_wow_flutter_percent": { "wow_rms": 0.139, "flutter_rms": 0.046, "classification": "unweighted_diagnostic" }, "channel_balance_db": { "value": -0.26, "classification": "diagnostic_only" }, "crosstalk_1khz_db": { "average_separation": 23.8, "left_to_right": -24.9, "right_to_left": -22.8, "directional_difference": 2.15, "classification": "supporting" }, "thd_percent": { "left": 2.26, "right": 1.85, "left_minus_right_percentage_points": 0.41, "classification": "diagnostic" }, "harmonic_profile_db": { "h2": { "left": -33.0, "right": -34.7 }, "h3": { "left": -49.4, "right": -54.6 }, "h4": { "left": -63.0, "right": -66.6 }, "h5": { "left": -71.1, "right": -74.7 }, "classification": "diagnostic" }, "harmonic_difference_summary_db": { "h2_left_higher": 1.7, "h3_left_higher": 5.3, "classification": "source_report_summary" }, "harmonic_reliability": { "classification": "steady_during_recording", "quality_note": "Steady during recording. Suitable for setup guidance." } }, "interpretation": { "summary": "The Technics SL-1410 MK2 averaged 33.33 RPM (−0.01%) with 0.040% DIN-shaped wow and flutter. Separation averaged 23.8 dB, but the two crosstalk directions differed by about 2 dB; channel balance was −0.26 dB. Harmonics stayed steady within this recording, while THD was higher on the left (2.26%) than the right (1.85%).", "recommendation": "Repeat the capture with unchanged settings to assess whether the channel differences recur. Document the remaining setup and capture settings.", "repeat_required": false }, "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 supplied report identifies Technics SL-1410MK2, Empire 7000/III and ART USB phono plus. Its capture input label is USB Audio CODEC. These session-specific labels supply the published chain. The user supplied IMG_4209.HEIC as the turntable photograph.", "known_limitations": [ "Tonearm model, stylus details, loading, tracking force, alignment, anti-skate, test-record identity/track, gain, capture format, software versions, timezone, sample ownership and repeat count were not supplied.", "One supplied report; steady harmonics within a recording do not establish repeatability across sessions.", "Reported differences retain the original precision and may differ from subtraction of rounded channel values." ], "photo_treatment": "AI-assisted cosmetic retouch, background removal, studio lighting and digital removal of the raised dust cover. Original HEIC preserved. Rotation-fingerprint source PNGs are preserved without image editing; WebP copies are format conversions for web display.", "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." }, "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", "Technics SL-1410 MK2", "Empire 7000/III", "ART USB Phono Plus", "USB Audio CODEC", "vinyl measurement", "rotation fingerprint", "wow and flutter", "cartridge crosstalk" ] }