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3 M
ORE ABOUT MEASUREMENT
This section explains various aspects of headphone measurement in more detail.
3.1 T
HE FREQUENCY RESPONSE GRAPH
Figure 2 shows an example frequency response graph. This is the most common and useful graph correlating to
headphone sound. Some of the important controls are highlighted in red. In REW, this is the default display, and
is selected with the highlighted button "SPL & Phase." (The specifics here relate to REW, but any measurement
program will have similar functions.)
The frequency response graph (in red) shows how the measured SPL of the headphone varies with frequency.
For example, at 4 kHz the SPL is 75 dB, as shown by the blue markers overlaid on the graph. Underneath the
graph is a set of checkboxes; usually, you will need to display only the amplitude response (named "Left" in this
example), and leave Phase and Mic/Meter Cal unchecked.
The frequency range is 20 Hz to 20 kHz, as indicated by the scale along the bottom. The SPL range is 50 to 100
dB, as indicated by the scale on the left. You can set the scales by clicking on the Limits button at the top right.
While it is certainly possible to measure over a larger frequency range e.g. 10 Hz to 24 kHz, note that:
•
Low frequency measurements are easily corrupted by noise, and
•
The calibration/compensation files don't go higher than 20 kHz.
1
The measurements in this section are intended to illustrate certain points. They are not intended as reference
measurements of the headphones and IEMs mentioned.
miniDSP Ltd, Hong Kong /
www.minidsp.com
Figure 2. An example frequency response measurement
/ Features and specifications subject to change without prior notice
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