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Overview Headphone • Power • Voltage
Table shows the power consumption of head-
phones with different impedance at different
levels.
Impedance
32 O
60 O
hm
hm
Pegel (U
)
Power consulmtion in mW
eff
0,1 V
0,31
0,16
0,5 V
7,8
4,2
1 V
31,3
16,7
2 V
125
66,7
3 V
281
150
4 V
500
267
5 V
781
420
6 V
1,13 W
600
7 V
1,53 W
817
8 V
2 W
1,06 W
9 V
2,53 W
1,35 W
Table shows the voltage needed for 1 mW
power on different impedance.
Impedance
32 O
60 O
hm
hm
Unit
Voltage needed for 1 mW power
Volt
179 mV
245 mV
dBu
-12,7
-10
0 dB=775 mV
dBV
-14,9
-12,2
0 dB=1V
120 Ohm
300 Ohm
0,08
0,033
2,1
0,83
8,3
3,3
33,3
13,3
75
30
133
53
210
83
300
120
408
163
533
213
680
270
120 Ohm
300 Ohm
347 mV
550 mV
-7
-3
-9,2
-5,2
0
Black Cube Linear Pro
Comparison chart of common headphones of
well-known manufactures. It can easily be seen
that even among the products of one manu-
facturer there can be huge differences as far as
impedance and/or efficiency are concerned.
This makes it very important that you choose
headphone and headphone amplifier as a
matching combination. Or go for a headphone
amplifier with selectable gain that can be used
with a wide variety of headphones. Purchasing
the Black Cube Linear Pro is a perfect step in
the right direction.
Impedance
Efficiency
Ohm
dB / 1mW
AKG
K141Studio
55
101
K240DF
600
88
K501
120
94
K1000
120
74
Beyerdynamic
DT660
32
97
DT770,
250
96
DT880,
DT990
Grado
All
32
98
Koss
Portapo
60
101
Sennheiser
HD500
32
97
HD555
120
94
HD650
300
97
Ultrasone
HFI-15G
32
94
HFI-550
64
100
HFI-700
75
94
Lehmannaudio
Voltage
Power
for 100 dB
for 100 dB
SPL
SPL
209 mV
0,8 mW
3,1 V
16 mW
694 mV
4 mW
6,93 V
400 mW
253 mV
2 mW
800 mV
2,6 mW
225 mV
1,6 mW
218 mV
0,8 mW
253 mV
2 mW
694 mV
4 mW
775 mV
2 mW
716 mV
4 mW
252 mV
1 mW
548 mV
4 mW
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