Pressure profiling means varying the pressure during a shot rather than holding 9 bar throughout.
What it can do
A gentle ramp at the start acts as extended pre-infusion, letting the puck settle before full pressure. Fewer channels.
A declining ramp at the end reduces the aggressive extraction of the final seconds, which is where bitterness accumulates.
Lower peak pressure overall — 6 to 7 bar — often extracts more evenly and tastes sweeter, which is a genuine and repeatable finding.
Where it matters most
Very light roasts, which are hard to extract and channel easily.
Unusual or expensive coffees where you want the best possible result.
Where it does not
Milk drinks. A cappuccino does not reveal a pressure profile.
Medium roasts with good puck prep, which extract well at a flat 9 bar.
What it costs
Machines with proper profiling — paddle groups, spring levers, or electronically controlled pumps — start well above ordinary prosumer prices.
The cheaper 80%
Lower the OPV on a standard machine from 12 bar to 9, or to 6 or 7. A simple adjustment on many machines and it captures a lot of the benefit.
Use pre-infusion if your machine has it.
Fix the puck prep — WDT and a level tamp. Channelling is what profiling mostly compensates for.
The order
Grinder, water, technique, then profiling. It is the last 5%.
Last reviewed 8 August 2026