Discussion in 'IEMs and Portable Gear' started by k.e., Dec 5, 2016.
Wow, are these IEM cables really that non-conductive?
It varies a lot... and it's not price related.
Best one I've measured so far was 0.3 Ohm (Shure stock cable for SE846), the worst was 2 Ohm (Noble Audio). Most are below 1 Ohm. This InEar cable is not great...
EDIT: I found back my measurements, the Shure was even lower than I remembered.
In terms of damping factor Zin / Zout, it's not only frequency response, transient response is also affected. (There could be other factors at play here too, like power**). Frequency response, via FFTs is nice and all; but time domain can tell us some more.*
Here are un-EQ'd, un-compensated 500hz square waves of the PP8 from three difference sources. I tried to normalize the volumes as much as possible, but difficult to do with digital volume controls.
Sony X Walkman
*Please don't be dumb and try to infer frequency response from a 500Hz square wave. Frequency response is better inferred from a frequency response plot - duh? Also, the square wave is just that, a square wave. It is not the ONE measurement that rules them all, despite how many people want it to be, possibly because of its exquisite shape and modern straight lines. In this case, we are looking at the transient behavior (overshoots, undershoots, ringing), that is how well the drivers are being controlled.
**I am not absolutely certain. There needs to be more discovery in this area.
Trying not to read too much into this but the laptop out has the best square wave. What's the OI of the laptop? I'm also curious if power, low vs high, can have an effect here?
No idea. It was my work laptop.
That matches my experience. I've measured a bunch of Effect Audio and Plus Sound stuff (I don't remember which exact models) and they were all in the means of 1.5 ohm per wire, so about 3 ohm in total.
InEar recently started to produce their own cables. They measure about 1.5 ohm per wire as well, just as the PlasticsOne they used before.
One of the lowest I measured were the Campfire Audio cables at about 0.5 ohm per wire, if I remember correctly. Coincidentally that is just the same as the Vision Ears cables that happen look very similar to Campfire's product.
What I found even more interesting is that a random AliExpress cable measured the same and shared the looks too. It was less than 5€.
I just got this guy in the post yesterday:
Roughly 80 USD through Amazon.jp. Impedance: 0.5 Ohm each way. Awesome build quality and ergonomics. Very happy with it.
Why anyone would spend hundreds of dollars on a cable with high impedance is beyond me. Especially because all those braided super thick cables are terrible ergonomically. Oh, and you look like an idiot.
We're saying that higher damping factor is better, right? Or am I missing something. So the ratio Z_load/Z_amp should be high.
Not sure how low damping factor would sound like.
Who wants some more PP8 measurements?
All measurements at CV (94 dB @ 500 Hz --> 38 mV for the PP8)
Both switches OFF. When I find some more time I can do some measurements for the switches, but I'm not in a hurry.
Blue PP8 - Purple Shure SE846 with blue filter no foam. (note the 250 Hz anti-resonance is a coupler artifact, I don't see it on another coupler).
Compensated with "Harman" target. The compensation curve I use doesn't actually have the >10 kHz roll-off like the Harman target.
THD @ CV. Dominated by 3rd order (not shown here)
Impulse response. Pretty tidy, but not perfectly aligned. For shits and giggles, the impulse response for the Katana below... not so good.
EDIT: PP8 measurement below on the other coupler (45AG) to show the smoother LF response
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