Sandman65
Head-Fier
- Joined
- Aug 24, 2012
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Do dynamic headphones have impedance phase angles or do they only present a simple resistive (vs. freq) load to amplification?
How is it derived in this case?
Do dynamic headphones have impedance phase angles or do they only present a simple resistive (vs. freq) load to amplification?
As I noted, it is a very simple model, R1 and L1 simulate the resistance and inductance of the voice coil, while R2, L2, and C1 create the resonant peak at the primary resonance frequency of the driver (~90 Hz in this case). You can read an article on this model here. It is obviously not complete, and does not take into account the resonances of the enclosure, for example, nor any non-linearities. For simulating a load to an amplifier, the capacitance of the cable (typically at least a few hundred pF) is also relevant, as it may cause stability problems with a not sufficiently well implemented amplifier.
Are you interested in how the component values can be calculated ?
Imaginary Numbers...yeah, I think I know what your driving at.
Once again I had a OCD moment where I thought if AMP output (SOA?) charts and headphone loads are known one could determine better system matching.
(mostly to avoid clipping at typical playback volumes).
Seems more like Impractical or Intractable (numbers) vs. Imaginary?
I've moved past this latest execise in futility...
do people really not know about HeadRoom's graphs, or that Tyll has continued measuring, contributing at http://www.innerfidelity.com/
http://www.headphone.com/learning-center/build-a-graph.php?graphID%5B0%5D=933&graphID%5B1%5D=703&graphID%5B2%5D=573&graphID%5B3%5D=2151&graphType=7&buttonSelection=Compare+Headphones
the graph doesn't range the axis but It looks like you can see a couple of bumps in the Ultrasone
the Senn HD600 has a nearly 2x impedance bump at the diaphragm mass-spring resonance frequency, maybe a breakup mode resonance bump and the generally rising impedance to the the right is likely voice coil inductance