{ "$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-2026-0009", "record_version": "0.9.1", "publication_status": "draft", "title": "BENZ SPJ — VYGER Atlantis / VYGER INERTIAL / ART USB Phono Plus — Hi Fidelity Milan", "source_report_title": "Benz SPJ VYGER Atlantis", "slug": "gs-2026-0009-benz-spj-vyger-atlantis-hi-fidelity-milan", "measurement_datetime_local": "2026-10-04T13:40:00", "measurement_timezone": "not_recorded", "date_published": "2026-10-06", "sample_id": "not_recorded", "setup": { "turntable": "VYGER Atlantis", "tonearm": "VYGER INERTIAL", "cartridge": "BENZ SPJ", "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": "not_recorded", "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": "Hi Fidelity Milan — CHARIO Academy room", "adjustments_for_measurement": "none; setup measured as found, per measurer" }, "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": 33.21, "maximum": 33.44, "span": 0.23, "classification": "primary" }, "din_shaped_wow_flutter_percent": { "value": 0.032, "classification": "primary" }, "raw_speed_variation_percent": { "rms_plus_minus": 0.197, "two_sigma_plus_minus": 0.393, "classification": "unweighted_diagnostic" }, "raw_wow_flutter_percent": { "wow_rms": 0.189, "flutter_rms": 0.049, "classification": "unweighted_diagnostic" }, "channel_balance_db": { "value": 0.49, "classification": "diagnostic_only" }, "crosstalk_1khz_db": { "average_separation": 27.4, "left_to_right": -25.9, "right_to_left": -28.9, "directional_difference": 3.03, "classification": "supporting" }, "thd_percent": { "left": 0.96, "right": 1.06, "left_minus_right_percentage_points": -0.11, "classification": "diagnostic" }, "harmonic_profile_db": { "h2": { "left": -40.7, "right": -39.5 }, "h3": { "left": -51.4, "right": -58.8 }, "h4": { "left": -60.7, "right": -65.2 }, "h5": { "left": -65.2, "right": -68.3 }, "classification": "diagnostic" }, "harmonic_difference_summary_db": { "h2_right_higher": 1.2, "h3_left_higher": 7.4, "classification": "source_report_summary" }, "harmonic_reliability": { "classification": "steady_during_recording", "quality_note": "Steady during recording. Suitable for setup guidance." } }, "interpretation": { "summary": "Measured as found in the CHARIO Academy room at Hi Fidelity Milan, with no setup adjustments: the BENZ SPJ / VYGER Atlantis / VYGER INERTIAL / ART USB Phono Plus chain averaged 33.33 RPM (−0.01%), with 0.032% DIN-shaped wow and flutter, 27.4 dB average separation and +0.49 dB channel balance. Harmonics were steady during recording. The measurer reports a successful 100 µm tracking-ladder pass and credits the new INERTIAL tonearm as a major contributor to that performance.", "recommendation": "Preserve this unchanged show-room setup as a baseline. A longer documented repeat could explore the 3.03 dB directional separation difference and extend the tracking-ladder observation.", "repeat_required": false, "tonearm_context": "The newly identified VYGER INERTIAL tonearm was central to the tracking demonstration. Michelangelo Canonico attributes much of the successful 100 µm tracking-ladder performance to this new arm, with no setup adjustments made for the session. The supplied INERTIAL manual describes a movable counterweight supported by an air bearing and controlled laterally by magnetic forces. The manufacturer explains that this arrangement allows freer lateral movement when following record eccentricity. It also describes a shorter counterweight-to-pivot distance intended to reduce vertical inertia. These design features provide context for the strong tracking demonstration; this single session did not isolate the arm’s contribution from that of the cartridge and turntable." }, "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 title identifies BENZ SPJ and VYGER Atlantis and the input field reports USB Audio CODEC. The measurer supplied the ART USB Phono Plus identity, show and room, no-adjustment context, 100 µm ladder pass and acknowledgement. On 7 October 2026, the measurer identified the new tonearm through the supplied INERTIAL manual and attributed much of the tracking performance to it.", "known_limitations": [ "A quick show-room capture with no setup adjustments, according to the measurer; not an optimised or controlled laboratory comparison.", "Stylus, loading, tracking force, alignment, anti-skate, test-record identity and track, interface routing and gain, capture settings, software versions, timezone and repeat count were not supplied.", "The 100 µm tracking-ladder pass is a measurer-reported session observation outside the source PDF; frequency, record and pass criterion were not supplied.", "Reported differences retain source precision and may differ from subtraction of rounded channel values.", "No before/after tonearm comparison was supplied; the arm’s major contribution is the measurer’s assessment, supported by design context from the manual rather than an isolated causal measurement." ], "photo_treatment": "Original event photograph preserved. Web image is a resized format conversion with no AI retouching or background replacement." }, "files": { "human_readable_record": "README.md", "source_report": "report.pdf", "checksums": "checksums.sha256", "source_hero": "assets/source/hero-original.heic" }, "keywords": [ "Groove Scope", "Direct Sound Records", "Michelangelo Canonico", "BENZ SPJ", "VYGER Atlantis", "ART USB Phono Plus", "Hi Fidelity Milan", "CHARIO Academy", "Pino Viola", "tracking ladder", "100 µm", "VYGER INERTIAL" ], "session_observations": { "source": "Measurer account supplied with publication request", "event": "Hi Fidelity Milan", "room": "CHARIO Academy", "setup_adjustments_made": false, "tracking_ladder": { "passed_level_um": 100, "test_record": "not_recorded", "test_frequency_hz": "not_recorded", "pass_criterion": "not_recorded", "included_in_source_pdf": false, "interpretation": "Tracking result applies to the complete turntable/tonearm/cartridge setup.", "tonearm_contribution": "The measurer attributes much of the good tracking performance to the new VYGER INERTIAL tonearm." }, "acknowledgement": "Thank you to Pino Viola for giving Direct Sound Records the opportunity to measure the VYGER Atlantis in the CHARIO Academy room. For us, it was a privilege to spend time with a turntable we regard as one of the world’s finest." }, "date_modified": "2026-10-07", "technical_sources": [ { "title": "INERTIAL tonearm manual", "source": "MANUAL'S TONEARM INERTIAL.DOCX, supplied by the measurer on 2026-10-07", "description": "Manufacturer design explanation; not an independent comparative performance test." } ] }