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Anybody know if any impedance charts exist for this set? The ER4 was a rare BA IEM that had a high enough impedance where it would still sound good on a smartphone.
I picked up the ER4XR recently (some ba driver as the ER3s). No issue driving from my iphone7 w/ just the lightning to 3.5m adapter. I have to kick the volume up to near max for my prefered listening level. My Fiio3 and xDuoo have similar issues, 85-90% volume (although those can go past the 100 reading).
Right, but since BAs have a swinging impedance, with high impedance sources like an iPhone, the treble or bass can be destroyed if the impedance swings too low. The Campfire Orion's brutal for that. The impedance of the ER4 never dips so low that an iPhone would interfere with it at all - but the downside is you need to give it a bit of juice.
22 ohms at 1kHz suggests that it'll swing very low in the bass or treble - I just wish there was an impedance graph to indicate where/how bad it is.
Great link, thanks!
Unfortunately I'm not seeing the impedance graph itself, like the second graph down on the left side here:
The golden rule is that your output impedance should be no more than 1/8th the headphone's impedance at any point. Smartphones in general have 2-10 ohms output impedance (whereas high res players are pretty much exclusively >= 0.5 ohms), so if the impedance ever rises below 16-80 ohms in some spots but not others, you're going to notice a dropout in that area.
Practically speaking, this only really applies if the impedance ever drops to single digits... it's just that many, many BAs do.
Oh interesting, thanks for sharing. Any thoughts on a good portable source for these?
To be honest, any express-purpose music player built in the last few years should have very low output impedance and would work great. Any DAP worth its salt should have that listed in the specs sheet. 0.5 ohms or less is fine.
Most the galaxy phones i've seen have below 1 ohm output impedance, and most are true high res players, like, can handle high res formats in software and hardware, but some need to be "rooted".