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iPhone 5 sound quality

post #1 of 239
Thread Starter 

Check this out. The charts made me laugh. So much for iPods having a "sound signature"!

 

http://www.kenrockwell.com/apple/iphone-5/audio-quality.htm

post #2 of 239
What's the point? Audiophiles who hear all kinds of things and speak of "sound signatures" don't believe in measurements. Nothing will ever convince them that what they hear is imaginary.
Edited by skamp - 1/26/13 at 4:35am
post #3 of 239

Not everyone is in that group, though, and it is nice to have more concrete information about various devices, and not just (usually not detailed, and often optimistic or outright false) manufacturer specs and subjective impressions.

Having said that, these measurements look flawed, <0.0002% THD at any audio frequency driving a 37.5 Ω load at 1 Vrms is "too good to be true". And it does not even increase with a real dynamic headphone load, even though it definitely should because of the output impedance. Maybe it is just a loopback of the analyzer ? normal_smile%20.gif

The noise (comparable to that of the MacBook Air) and output impedance look realistic, though.


Edited by stv014 - 1/26/13 at 5:22am
post #4 of 239
Quote:
Originally Posted by bigshot View Post

Check this out. The charts made me laugh. So much for iPods having a "sound signature"!

 

http://www.kenrockwell.com/apple/iphone-5/audio-quality.htm

I just looked at the chart there for the 4th-gen Touch, and it confirms what I always thought, that it was a very accurate player.

post #5 of 239
Quote:
Originally Posted by stv014 View Post

Not everyone is in that group, though, and it is nice to have more concrete information about various devices, and not just (usually not detailed, and often optimistic or outright false) manufacturer specs and subjective impressions.

Having said that, these measurements look flawed, <0.0002% THD at any audio frequency driving a 37.5 Ω load at 1 Vrms is "too good to be true". And it does not even increase with a real dynamic headphone load, even though it definitely should because of the output impedance. Maybe it is just a loopback of the analyzer ? normal_smile%20.gif

The noise (comparable to that of the MacBook Air) and output impedance look realistic, though.

Yeah I'm not buying those THD measurements.

post #6 of 239

Something's definitely wrong with the THD measurements. It has 3 - 4 ohms output impedance but drives a 32 ohm headphone with 0.00015% THD?

 

 

Here's a RMAA test (recorded with an E-MU 1616m I think):


Edited by xnor - 1/26/13 at 7:22am
post #7 of 239
Thread Starter 

Are you guys seriously talking about the difference between 0.0002% THD and 0.0017% THD?!

post #8 of 239

Nope 0,002 vs 0,0002. No harmonic distortion at all is most definitely suspicious.

post #9 of 239
Quote:
Originally Posted by bigshot View Post


No, but the THD figures are suspect. The A-weighted noise figure was -106, which if the THD figure was THD+N would be .0005%, except A-weighting is never used for THD, so the figure should have been more like .001%.

It's not the specific numbers that's the problem, it's that they don't make sense, which then casts doubt on all the measurements.
post #10 of 239
Quote:
Originally Posted by bigshot View Post

Are you guys seriously talking about the difference between 0.0002% THD and 0.0017% THD?!

No, we're talking about the difference of incorrect and correct measurements.

 

 

Btw, he's getting nearly exactly the same (incorrect) THD values for the iPod Touch 5G.


Edited by xnor - 1/26/13 at 12:00pm
post #11 of 239
Thread Starter 

How many angels correctly dance on the head of a pin?

post #12 of 239
7
post #13 of 239
If you don't think that 7 is a credible number of angles doing the pin-head shuffle, then you might also see that a measurement that looks too low for reality calls the rest of the set into question. How is it possible to get a THD plot like that when the noise measurement doesn't support it? A full bandwidth spectrum with 1KHz at 0dbfs would have cleared thing up, but he didn't publish it.

Your original point is not lost, though. Nothing in the measurements indicate a sonic signature.
post #14 of 239

I won't comment on this from an audio perspective, but I have experience with Ken Rockwell from the camera world. He's an utter hack, and despised amongst professional photographers, partly for being a Nikon shill (I own Nikons, so please don't accuse me of animosity toward the brand) but also for the sheer volume of crap he writes. He's stated that professional photographers should be shooting in jpeg instead of RAW (there's far less leeway for jpegs in editing), doctored pictures on his site so he could claim he has special custom gear that doesn't really exist, used press-release images on his site and then stamped his logo on them so they appear like he shot them himself, and covers it all up with an "I'm just joking, this entire site is a joke, don't take it seriously" clause to legally cover his BS. He's a quintessential hack, and I would be extremely critical of any information found on on his site. 

post #15 of 239
Quote:
Originally Posted by jaddie View Post

Your original point is not lost, though. Nothing in the measurements indicate a sonic signature.

Would that not be a signature unto itself though? biggrin.gif

se
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