Quote:
Confusing
I've been reading further insights from what I assume is the same FritzS on this German board -
http://www.hifi-forum.de/viewthread-110-12140-5.html. I had to use google translate but the reviews appear positive.
@bigtim
yes I publish this test reports too. I dont translate the next test reports, have shorten time - and with Google translation it's horrendnous. My native language are German and my English is not soo good, but good enough to see the bad Google translation. The better way - no translation and writing new in English. (Mostly I use http://www.dict.cc/)
Told in a short answer - the K550 is a good closed Headphone:
The K550 is a very pleasant musical headphones - my impression is rather warm, plump intoned.
Analytically, so that one seems to hear every hair of the brushes, when the drummer passes over the cymbals or drums - that he is not, in this direction K701/702 Q701 come closer.
You can use the K550, when volume is moderate provided (rather low), very long listening without fatigue.
But understand this as my impression, others could have another impression. I know (my credo) HiFi is not an exactly academics
Data of some common headphones (unfortunately the values are slightly different above, so you have to convert):
AKG K701, K702, Q701
Frequency response: 10 Hz - 39,8 kHz (Q701)
Sensitivity: 105 dB SPL / V
Nominal power: 200 mW
Impedance: 62 ohms
AKG K271 MKII
Frequency response: 16 – 38.000 Hz
Sensitivity: 91 dB SPL/V
Power handling capacity: 200 mW
Impedance: 55 Ohm
AKG K550
Frequency response: 12 – 28.000 Hz
Sensitivity: 114 dB SPL/V
Power handling capacity: 200 mW
Impedance: 32 Ohm
V(WBCV)@94dB SPL = 135 mV
Denon AH-D7000
Impedance: 25 Ohm
Sensitivity: 108 dB / mW
Maximum capacity: 1,800 mW
Frequency range: 5 - 45,000 Hz
BEYERDYNAMIC TESLA T1 HEADPHONES
Transducer type: Dynamic
Operating principle: Semi-open
Frequency response: 5 Hz - 50,000 Hz
Impedance: 600 Ohms
Nominal SPL: 102 dB (1 mW / 500 Hz)
Nominal THD: <0.05% (1 mW / 500 Hz)
Power handling capacity: 300mW
Max SPL: 126dB (300mW / 500 Hz)
Sennheiser HD800
Frequency response: 8 - 50,000 Hz
Nominal impedance: 300 ohms
Sound pressure level at 1 kHz: 102 dB (1 kHz, 1 Vrms)
Max Continuous nominal input power: 500 mW according to EN 60-268-7
Sennheiser HD600
Frequency response: 12-39000 Hz (- 10 dB / 1 kHz)
Nominal impedance: 300 ohms
SPL: 112 dB at 1 kHz, 1 Vrms
Max Continuous nominal input power: 200 mW
So we can calculate the demand power (and max. current and voltage spikes) and the necessary operating voltage. The max. SPL of 126dB can serve as a guide.
a) HA according to the standard of 120 ohms in series
b) HA amplifier 68 ohms in series
c) HA amplifier directly coupled to headphone.