Lehmannaudio Manual Black Cube Linear - page 7 -
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Table of effectivity of common headphones
3
Type Impedance
/Ohms
Effektivity
dB/1mW
Voltage for
100dB SPL
Power for
100dB SPL
AKG
K141Studio 55 101 209mV 0,8mW
K240DF 600 88 3,1V 16mW
K501 120 94 694mV 4mW
K1000 120 74 6,93V 400mW
Beyerdynami
c
DT660 32 97 253mV 2mW
DT770, DT880,
DT990
250 96 800mV 2,6mW
Grado
All 32 98 225mV 1,6mW
Koss
Portapro 60 101 218mV 0,8mW
Sennheiser
HD500 32 97 253mV 2mW
HD555 120 94 694mV 4mW
HD650 300 97 775mV 2mW
Ultrasone
HFI-15G 32 94 716mV 4mW
HFI-550 64 100 252mV 1mW
HFI-700 75 94 548mV 4mW
It can easily be seen that even among the products of one manufacturer there can
be huge differences as far as impedance and/or effectivity are concerned. This
makes it very important that you either choose headphone and headphone
amplifier as a matching combination or go for a headphone amplifier with
switchable gain that can be used with a wide variety of headphones. Purchasing the
Black Cube Linear was a perfect stepp in the right direction.
3
All figures were taken from freely available data sheets of different manufacturers and have been partly recalculated
from other dimensions. Voltage and power are referring to effective values and not to peak values. All figures are given
without any guarantee.
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