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(Some) Source headphone output impedance.

post #1 of 19
Thread Starter 
 

 

Thanks to

Originally Posted by tomscy2000

 

http://monoadc.blog64.fc2.com/blog-entry-99.html

 

 

 

DAP class
Manufacturer Model name Zo / Ω Remarks Source
Apple iPad 1.39   Golden Ears
1.30   Sonobe
iPad2 1.03   Golden Ears
1.03   Sonobe
new iPad 0.78   Golden Ears
0.84   Sonobe
iPhone3GS 2.09   Sonobe
iPhone4 0.97   Golden Ears
1.00   Sonobe
iPhone4S 1.90   Golden Ears
1.83   Sonobe
iPhone5 3.27   Golden Ears
iPod 5.5th 5.29   Golden Ears
iPod classic 6th 5.02   Sonobe
iPod nano 4th 5.29   Golden Ears
iPod nano 5th 5.3   Sonobe
iPod nano 6th 2.08   Sonobe
iPod touch 1st 5.7 Some frequency dependence Sonobe
iPod touch 4th 3.74   Golden Ears
3.62   monoadc
iPod touch 5th 0.75   monoadc
COWON S9 2.17   Golden Ears
HiFiMAN HM-602 11.44   Sonobe
HM-801 18.11 Standard amplifier card Sonobe
33.69 IEM amplifier card
iriver Astell & Kern AK100 22.41 Some frequency dependence Golden Ears
SANYO ICR-XPS01MF 4.37 Some frequency dependence monoadc
KENWOOD MG-G608 0.49   monoadc
SONY NW-A847 3.2 Some frequency dependence Ayumi's Lab.
NW-A865 3.54 Some frequency dependence monoadc
NW-E052 3.01   monoadc
NW-S644 3.33   monoadc
NW-X1060 3.80 Some frequency dependence Sonobe
NWZ-A844 3.22   Golden Ears
NWZ-S755 3.40   Golden Ears
NWZ-X1050 3.95   Golden Ears
Sony Ericsson IS11S 13.8   Ayumi's Lab.
Transcend MP330 1.48 Some frequency dependence monoadc
post #2 of 19
Thread Starter 

Reserved.

post #3 of 19

Nice chart!

 

A  few comments:

 

- iPhone 5 impedance has been measured this week by Sonobe at 3.3

 

- Sony chart applies for non EU units. Unfortunately many Sonys sold in Europe are volume capped (via higher output impedance)

 

. Some boutique or 'audiophile grade' devices' output impedance is outrageous. Coupled to horrid UI puts them on the verge of a (fidelity) scam offense.

 

- Touch 5 is the best sounding iPod ever. In the realm of iPhone 4/4S and iPad 3.


Edited by elfary - 11/8/12 at 3:28am
post #4 of 19

any measurements available for new Ipad 4 ?

 

sort of hoping for a good result after the Ipod Touch 5 result

post #5 of 19
Thread Starter 

Bumped as there seems to be a lot of talk about output impedance recently.

 

Also here the amps, they can be used to `fix` the sources high impedance or just perhaps improve the sound and provide more power.

http://www.head-fi.org/t/635185/some-dac-portable-amps-headphone-output-impedance#post_8846588

post #6 of 19

Hey, maybe I'm a noob or whatever but why the impedance of the ipod touch 4th gen is so low? I've checked the Apple website for full spec and it says that its impedance is 32 ohms. http://support.apple.com/kb/SP594. Is it something to do with the 1/8th rule? 32/8=4. The results above are pretty close to 4. I'm slightly confused here.

 

I plan to buy a Ortofon e-Q5 and a reviewer says that players with output 32 ohms will struggle with the e-Q5. So how do I know if my old ipod touch 4th gen is up to the task? Somewhere around 8 ohms or less would do perfectly.


Edited by justcurious - 2/6/13 at 6:31am
post #7 of 19
Quote:
Originally Posted by justcurious View Post

Hey, maybe I'm a noob or whatever but why the impedance of the ipod touch 4th gen is so low? I've checked the Apple website for full spec and it says that its impedance is 32 ohms. http://support.apple.com/kb/SP594. Is it something to do with the 1/8th rule? 32/8=4. The results above are pretty close to 4. I'm slightly confused here.

I plan to buy a Ortofon e-Q5 and a reviewer says that players with output 32 ohms will struggle with the e-Q5. So how do I know if my old ipod touch 4th gen is up to the task? Somewhere around 8 ohms or less would do perfectly.

Output impedance should be close to zero as possible, your ortofon has an impedance of 40 according to website, there will be no problems
post #8 of 19

HM-801's OPI hands down all the portable sources devil_face.gif

post #9 of 19
I don't see the iPad 3 on the list?
Reply
post #10 of 19

^

iPad 3 aka new iPad

post #11 of 19
Quote:
Originally Posted by gold1304 View Post

^

iPad 3 aka new iPad

 

isn't the "new" ipad the ipad 4 with Lightning connector?

Reply
post #12 of 19

^

The list has been there for a while. I think before ipad 4 was released so I assumed the new ipad is ipad 3. Apple referred ipad 4 as "ipad with retina display" also.

post #13 of 19
I see... Thanks for explaining. Looks like iPad 3 and iPhone 4 is best of the Apple bunch. Has anyone tested the new iPad Mini? Is iPod Touch 5th the current one?
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post #14 of 19
Thread Starter 

I would also recommend clicking on the link to the info source page as they update it whenever they get new information.

 

The copied and pasted above information (OP) though quite informative will not be inclusive to all new information.

 

http://monoadc.blog64.fc2.com/blog-entry-99.html

post #15 of 19
Quote:
Originally Posted by ExpatinJapan View Post

I would also recommend clicking on the link to the info source page as they update it whenever they get new information.

 

The copied and pasted above information (OP) though quite informative will not be inclusive to all new information.

 

http://monoadc.blog64.fc2.com/blog-entry-99.html

 

Thank you.  I wish the site was in English. :(

 

The iPad 3 looks to be an outstanding performer.

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