{ "$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-2026-0010", "record_version": "0.9.0", "publication_status": "draft", "title": "Shure V15 V / JICO Custom Shop MR — Micro Seiki DQX500 / MA707 — 1 kHz Reference Check", "source_report_title": "JICO Shure V15 mr - Micro Seiki DQX500 - MA707 - Audio research SP20 - EVO4", "slug": "gs-2026-0010-shure-v15-v-jico-custom-shop-mr-micro-seiki-dqx500", "measurement_datetime_local": "2026-10-18T12:04:00", "measurement_timezone": "not_recorded", "date_published": "2026-10-18", "sample_id": "not_recorded", "setup": { "turntable": "Micro Seiki DQX500", "tonearm": "Micro Seiki MA707", "cartridge": "Shure V15 V", "stylus": "JICO Custom Shop MR", "cartridge_hours": "not_recorded", "stylus_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": "Audient 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": -0.02, "classification": "primary", "direction": "slow" }, "settled_rpm": { "minimum": 33.27, "maximum": 33.39, "span": 0.12, "classification": "primary" }, "din_shaped_wow_flutter_percent": { "value": 0.025, "classification": "primary" }, "raw_speed_variation_percent": { "rms_plus_minus": 0.102, "two_sigma_plus_minus": 0.204, "classification": "unweighted_diagnostic" }, "raw_wow_flutter_percent": { "wow_rms": 0.096, "flutter_rms": 0.032, "classification": "unweighted_diagnostic" }, "channel_balance_db": { "value": -0.01, "classification": "diagnostic_only" }, "crosstalk_1khz_db": { "average_separation": 27.3, "left_to_right": -26.5, "right_to_left": -28.2, "directional_difference": 1.7, "classification": "supporting" }, "thd_percent": { "left": 0.65, "right": 0.49, "left_minus_right_percentage_points": 0.16, "classification": "diagnostic" }, "harmonic_profile_db": { "h2": { "left": -43.8, "right": -46.3 }, "h3": { "left": -70.1, "right": -73.8 }, "h4": { "left": -73.4, "right": -74.8 }, "h5": { "left": -82.2, "right": -70.0 }, "classification": "diagnostic" }, "harmonic_difference_summary_db": { "h2_left_higher": 2.5, "h3_left_higher": 3.7, "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": "An original Shure V15 V with a new JICO Custom Shop MR stylus gives an encouraging result in this Micro Seiki DQX500 / MA707 / Audio Research SP20 / Audient EVO4 capture: 33.33 RPM (−0.02%), 0.025% DIN-shaped wow and flutter, −0.01 dB channel balance and 27.3 dB average separation. THD measured 0.65% left and 0.49% right. The measurer describes clear, revealing sound before break-in and a surprisingly quiet background; the report calls for a repeat of the right-channel third-harmonic check before setup changes.", "recommendation": "Keep this encouraging baseline and repeat the capture before making further cartridge adjustments, following the report's right-channel H3 reliability note. Record loading, tracking force, alignment, test-record and capture settings for reproducible comparisons. A future comparison with modern stylus profiles is planned.", "repeat_required": true, "alignment_context": "The measurer reports an initial azimuth-related reading of roughly −3.5 dB and says Groove Scope for iPhone helped bring the indication within the app's tolerance. The exact dB quantity and the initial numerical record were not supplied, so this observation is not treated as an azimuth angle, a signal channel-balance result or a quantified before/after comparison. The final report separately records −0.01 dB signal channel balance and 1.70 dB crosstalk balance.", "distortion_context": "During adjustment, the measurer observed a reduction in harmonic distortion, particularly the third harmonic, and felt further refinement remained possible. This is a session observation without a supplied numerical before/after record. The final report warns that the right-channel third harmonic changed most during recording and advises a repeat before changing cartridge setup.", "listening_context": "Michelangelo Canonico describes the sound as clear and revealing even before break-in, with a surprisingly quiet background. He regards a carefully aligned JICO MR stylus on this classic Shure cartridge as a promising combination and plans a comparison with modern stylus profiles. These are listening impressions and plans; this session does not establish superiority over other profiles." }, "session_observations": { "source": "Measurer account supplied with publication request", "included_in_source_pdf": false, "cartridge_condition": "Original Shure V15 V cartridge, per measurer", "stylus_condition": "New JICO Custom Shop MR stylus, per measurer; operating hours not recorded", "azimuth_adjustment": { "adjustment_app": "Groove Scope for iPhone", "initial_reading_db_approximate": -3.5, "reading_quantity": "not_recorded", "initial_numerical_record_supplied": false, "result": "Within the app's tolerance, per measurer; further refinement considered possible", "final_reading_db": "not_recorded", "physical_azimuth_angle": "not_recorded" }, "distortion_during_adjustment": { "observation": "Harmonic distortion decreased during azimuth adjustment, particularly the third harmonic, according to the measurer", "numerical_before_after_record_supplied": false }, "listening_impressions": { "attribution": "Michelangelo Canonico", "context": "Before break-in, according to the measurer; stylus hours were not supplied", "sound": "Clear and revealing, with a surprisingly quiet background" }, "future_comparison": "The measurer plans a comparison with modern stylus profiles; no comparative result is included in this record" }, "provenance": { "source_type": "Groove Scope generated PDF report", "source_file": "report.pdf", "data_entry_method": "Values transcribed verbatim from the original PDF report and visually verified against its rendered page; reported 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 report title identifies JICO Shure V15 mr, Micro Seiki DQX500, MA707, Audio research SP20 and EVO4. Its input field is blank. The measurer identifies the cartridge as an original Shure V15 V with a new JICO Custom Shop MR stylus, confirms the Micro Seiki DQX500 and MA707, Audio Research SP20 and Audient EVO4, and supplies the azimuth-adjustment and listening context.", "known_limitations": [ "Cartridge and stylus hours, loading, tracking force, alignment, anti-skate, physical azimuth angle, VTA/SRA, test-record identity and track, capture settings, software versions, timezone and repeat count were not supplied.", "The PDF input field is blank; Audient EVO4 is the interface identity supplied by the measurer, not a recorded input-field label.", "The initial roughly −3.5 dB azimuth-related reading has an unspecified quantity and no supplied initial numerical record. It is distinct from the final report's signal channel balance and crosstalk balance.", "The reported decrease in distortion during adjustment and the listening impressions are measurer observations; no numerical before/after series or controlled stylus comparison was 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.", "The results describe the complete captured playback chain under its recorded conditions; contributions from the stylus, cartridge, tonearm, turntable, test record and electronics were not isolated." ], "fingerprint_channel_assignment": "L/R assignments follow the explicit L and R labels in the user-supplied filenames; the screenshots themselves do not display channel labels. Both channels show eight rotations. No inter-channel angular alignment is stated in the screenshots.", "photo_treatment": "Supplied photograph cosmetically retouched with AI to emphasise the cartridge through background and lighting treatment. Original HEIC preserved. Fingerprint PNGs are unedited and web copies use lossless WebP. The retouched hero is an editorial illustration and is not measurement evidence." }, "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", "Shure V15 V", "JICO Custom Shop MR", "Micro Seiki DQX500", "Micro Seiki MA707", "Audio Research SP20", "Audient EVO4", "vinyl measurement", "azimuth adjustment", "rotation fingerprint", "wow and flutter", "cartridge crosstalk" ] }