- Jul 21, 2018
- The Neitherlands
sensitivity is frequency dependent and shown in the frequency response.What about sensitivity? Can that be frequency dependent?
This plot kind of shows the sensitivity relative to 110dB/V at 400Hz between 200Hz and 8kHz.
So at 400Hz sensitivity = 110dB/V, at 1kHz = 109dB/V, at 4kHz = 99dB/V
Power into a headphone is irrelevant.
The only important aspect is the lowest impedance and overall sensitivity (dB/V) and what the maximum voltage is into the minimum load impedance.
For listening at impressively loud levels 120dB should be the target level.
For loud listening 105dB is the target.
For normal listening levels (one can endure for hours) 90dB is the target.
For this headphone sensitivity = 110dB/V and efficiency = 93dB/mW.
You thus only need 1V to reach loud levels and you will need 3V to reach 120dB SPL.
1V in 20ohm = 0.05W (50mW), 3V in 20ohm = 0.45W (450mW)
When one wants to raise the bass levels to Harman target one needs 4.3V (1W) in 20ohm.
Most people listening to this headphone to enjoy music will reach peaks of maybe 10mW and average levels of 0.5mW or so.
Music is dynamic so power levels are too.