# Simulatore di sala > Simulate clarity and reverberation (C50/C80/EDT/T30) in a rectangular room with an image-source lattice that is exact within the ideal specular shoebox model, and a listening-point heatmap. Practice: acustica Field: edilizia Status: Proto v0.1 Tag: Image Source Method, C50/C80, Acustica sale Method, assumptions and limits: Page: --- Demonstrative tool for room acoustics. In a rectangular (shoebox) room place the source and receivers, choose the materials of the 6 surfaces (per-band α from the library) and read C50, C80, EDT and T30 per octave band 125–4000 Hz: early reflections from an exact Image Source Method over the image lattice, diffuse tail from Eyring/Sabine. Heatmap of the chosen metric on the listening plane and before/after panel comparison. Rectangular geometries only, pre-dimensioning and teaching. This file is a **descriptor**, not the tool's documentation: it says what the tool computes and by what method, in summary. Formulas, assumptions, validity conditions and limits are in the wiki linked above. The tool runs in the browser at the page given.