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Low-frequency tests with heavy oscillators then become the main probes.","posed_since":"","precise":"For CSL with noise correlation cutoff frequency $\\Omega$ (colored) and/or collapse-noise temperature $T_{\\mathrm{CSL}}$ (dissipative), determine the excluded region of $(\\lambda, r_{C}, \\Omega, T_{\\mathrm{CSL}})$ from levitated and clamped mechanical oscillators, gravitational-wave detectors, bulk heating and interferometry, and whether parameters giving macroscopic collapse survive when $\\Omega$ lies below the X-ray frequency range.","problem_ref":null,"references":"","settled_by":"Low-frequency force-noise or heating measurements sensitive to collapse-induced diffusion that exclude or detect it across the colored and dissipative parameter space.","status_note":"XENONnT noted in 2025 that colored and dissipative extensions retain a wide unexplored region; levitated-optomechanics bounds on linear-friction dissipative models appeared in 2024 (arXiv:2401.04665).","title":"Bounds on 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