Why yield bands matter
We track beverage yield against dose so comparisons stay honest across machines. A 36g yield on 18g in is not the same drink as a lungo.
Reading the matrix
Sour + fast usually means channeling or too coarse. Flat + slow often means too fine or a tired basket.
Flavor: Channeling
Physical Cause
Uneven puck / preferential paths
Extraction Time
Fast start, then stalls
Actionable Fix
Improve distribution · WDT · level tamp · verify basket dose
Flavor: Sour / Under-extracted
Physical Cause
Under-extracted
Extraction Time
Pours in <20s
Actionable Fix
Grind finer · raise brew temp · lengthen ratio slightly
Flavor: Bitter / Over-extracted
Physical Cause
Over-extracted
Extraction Time
Chokes >38s
Actionable Fix
Grind coarser · lower yield · drop temp 1–2°C
| Taste Flaw | Physical Cause | Flow Indicator | Actionable Fix |
|---|---|---|---|
| Channeling | Uneven puck / preferential paths | Fast start, then stalls | Improve distribution · WDT · level tamp · verify basket dose |
| Sour / Under-extracted | Under-extracted | Pours in <20s | Grind finer · raise brew temp · lengthen ratio slightly |
| Bitter / Over-extracted | Over-extracted | Chokes >38s | Grind coarser · lower yield · drop temp 1–2°C |
What we publish
PDP scores fold extraction stability into the composite—never a single hero shot.