I have been test listening a big number of small inner earphonnes, over all 32 ohms seems to sund better than 16 ohms with a few exceptions, like Beyer Dynamic DTX-101 which have only 12 ohm. NwAvGuy, I have a Headstage Arrow 3G paired with the Phonak PFE 112 (balanced armature, 32 ohms). 0 0. bompiani. Some sources may not have enough voltage to drive the internal amp to full output. The K701 is less than kind to less than perfect recordings--which is to say most music. Some headphones, like the HiFiMan planars, need relatively high amounts of voltage and current making them the most challenging of all. It's the frequency where the driver is already most prone to excessive (unwanted) motion and when driven from a source impedance greater than 1/8th the headphone impedance the loss of electrical damping can result in exactly what you describe. In general, flat wire allows for either a more powerful, or more compact, voice coil. I believe they are 62 ohms. High pressure usually means low flow and visa versa. The magnetic system, diaphragm, suspension, damping and enclosure are all critical as well. Low impedance headphones are more prone to blowouts when using a powerful amp, but can still sometimes benefit from one. I understand what you are saying to apply to the 450s when the noise cancelling feature is in effect, however, what happens when it is not engaged. The lower moving mass of the 250- and 600-ohm headphones' voice coils is lighter than the 32-ohm models, and the lower mass is part of the reason high-impedance headphones sound better. IEMs will have severe frequency response variations with even 20 ohms of output impedance. Below is a portion of the E5 specs from their webpage.Specification ●Output Power: 150mW (16Ω Loaded) 16mW (300Ω Loaded) ●Signal to Noise Ratio: ≥95dB (A weight) ●Distortion:<0.009% (10mW) ●Frequency Response: 10Hz ~ 100KHz ●Suitable Headphone Impedance: 16 Ω ~ 300 Ω ●Power Supply: Rechargeable Li-Ion Battery●Recharging: USB 5V DC 400mA●Size: 44.2x38x12.6mm●Weight: 30gSo, from this, and the information you have provided in your articles and reponses to me, for me to play my music at the 115 dB level, for my particular heaphones, I will need just under 4 mW for this? For example the Clip+ portable player can put out 16 mW into 16 ohms but only 0.8 mW into 300 ohms. I may combine that testing with comparing real loads to simulated "lab" loads. Please keep comments on topic. Am I on the right track at all?Am I right to assume there should be limited distortion even at these levels, or is that a whole other question for another time?BTW, I plugged into a AT-PHA10 amplifier, in a big chain store in Tokyo, and, contrary to my previous assumption, the sound was louder even while the noise cancelling feature was engaged.

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