Absorption (inside a room)
Makes a room feel calmer. Does not stop sound from crossing into the next room.
Blocking transmission (between rooms)
Seals gaps and adds mass in the wall/door path. This is what actually stops bleed.
🧭 Plot Summary
A noise complaint sounds like a simple problem, but it isn't — sound can reflect off surfaces, get absorbed by soft materials, or transmit straight through a wall or door into the next room. A fix that targets the wrong one won't actually solve anything, no matter how nice it looks.
Your job is to figure out which of those three is actually letting band room sound bleed into the library, and propose a real fix that fits inside a real budget.
What you will do in this problem
- Learn what actually happens to sound when it hits a surface — reflect, absorb, or transmit through.
- Understand why some fixes make a room's own sound feel calmer, while other fixes are what actually stop sound crossing into the next room.
- Investigate a real bleed problem between two adjacent spaces.
- Diagnose the most likely cause using reflection/absorption/transmission reasoning, not guesswork.
- Propose an itemized fix that fits inside a real materials budget.
Why it matters
This is the payoff for the whole unit — the vocabulary from 3-1-1 and 3-1-2, and the tuning reasoning from Project 3-1-3, all feed into diagnosing a real acoustic problem instead of just guessing at a fix.
✅ Self-Check Before You Roll On
Check off each item as you get there. These are not grades — they are your own signal.