Philips: what they publish

In this database6 headphones

Figures from their own material2 of 6

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This page does not review anything Philips makes. It counts one thing: how much of what this database says about their products came out of their own documents, and how much had to be worked out or left blank.

Headphones

Where each sensitivity figure came from

Model	Impedance	Sensitivity	Source of the figure
Fidelio L3	16 Ω	103.0 dB	Unit not stated
Fidelio X3	30 Ω	98.0 dB/mW	Published per mW
SHP9500	32 Ω	101.0 dB	Unit not stated
SHP9500S	32 Ω	102.0 dB	Unit not stated
SHP9600	32 Ω	102.0 dB	Unit not stated
X2HR	30 Ω	100.0 dB/mW	Published per mW

Impedance is almost always printed. Sensitivity is the one that goes wrong, because a decibel figure means two very different things depending on whether it is per milliwatt or per volt — about five decibels apart at 300 Ω and eighteen at 16 Ω. The conversion is here.

Published per mW — 2: the maker prints a decibel figure per milliwatt, which is what the database stores
Unit not stated — 4: the maker prints a decibel figure with no reference unit, so it is shown as printed and flagged rather than quietly converted

In short

What the paperwork adds up to

Rather less than half of what this site says about Philips came from them. The rest is arithmetic, and it is marked as arithmetic on every page.

The rule used here is the same for every maker and is described on the manufacturer index. Every figure behind it can be opened on the product page it came from, with the document it came from linked.

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