title: HTDemucs Model Variant Comparison
subtitle: SDR and processing speed across 4 model variants on 50 MUSDB18-7s test tracks
run_date: March 14, 2026
run_timestamp: '2026-03-14T12:11:19'
device: Apple M4 MPS
dataset: MUSDB18-7s
dataset_url: https://zenodo.org/record/1117372
n_tracks: 50
stems:
- vocals
- drums
- bass
- other
key_finding: HTDemucs (base) achieves the highest mean SDR at 8.38 dB
models:
- id: htdemucs
  label: HTDemucs (base)
  sdr_vocals: 8.86
  sdr_drums: 10.52
  sdr_bass: 9.56
  sdr_other: 4.56
  sdr_mean: 8.38
  avg_time_seconds: 1.8
  n_tracks: 50
- id: htdemucs_ft
  label: HTDemucs FT (fine-tuned)
  sdr_vocals: 8.8
  sdr_drums: 10.82
  sdr_bass: 9.4
  sdr_other: 3.9
  sdr_mean: 8.23
  avg_time_seconds: 6.4
  n_tracks: 50
- id: htdemucs_6s
  label: HTDemucs 6S (6-stem)
  sdr_vocals: 8.53
  sdr_drums: 10.04
  sdr_bass: 8.52
  sdr_other: -3.42
  sdr_mean: 5.92
  avg_time_seconds: 1.6
  n_tracks: 50
- id: hdemucs_mmi
  label: Hybrid Demucs MMI (extended data)
  sdr_vocals: 8.78
  sdr_drums: 10.02
  sdr_bass: 8.43
  sdr_other: 4.24
  sdr_mean: 7.87
  avg_time_seconds: 3.3
  n_tracks: 50