Hi all! Sorry for my English - I'm from Russia.
I've tested my iPod Touch 3G 32 GB with RMAA and different earbuds.
Used Y-cable to split signal between phones and recording soundcard.
The Frequency Response with 16-Ohms Sony EX71 and 32-Ohms iBuds is similar and almost equal to unloaded signal (too good to be true!). But with UE SuperFi 5 Pro (21-Ohms) the graph goes crazy. See the image:
Can anyone explain that?
Does iPod have problems with low impedance? But EX71 have even less ohms, than UE. Or do armature IEMs have different impedance characteristics?
When I add airline adapter, included with UE, which is I believe a resistor - the chart becomes as flat as with other phones.
I also have iRiver LPlayer and cowon iAudio U3.
LPlayer also goes crazy with UE (but different from iPod), while cowon shows best graph with UE. see image:
The most interesting:
In real-life iPod sounds great to me and I can't really hear any big difference with Cowon U3. At least there is no that noticeable raise in mid-high, as it appears on chart.
Same for iPod with and w/o airline adapter.
Does that mean, the "Y-cable" loaded measurements with RMAA are incorrect?
I've tested my iPod Touch 3G 32 GB with RMAA and different earbuds.
Used Y-cable to split signal between phones and recording soundcard.
The Frequency Response with 16-Ohms Sony EX71 and 32-Ohms iBuds is similar and almost equal to unloaded signal (too good to be true!). But with UE SuperFi 5 Pro (21-Ohms) the graph goes crazy. See the image:
Can anyone explain that?
Does iPod have problems with low impedance? But EX71 have even less ohms, than UE. Or do armature IEMs have different impedance characteristics?
When I add airline adapter, included with UE, which is I believe a resistor - the chart becomes as flat as with other phones.
I also have iRiver LPlayer and cowon iAudio U3.
LPlayer also goes crazy with UE (but different from iPod), while cowon shows best graph with UE. see image:
The most interesting:
In real-life iPod sounds great to me and I can't really hear any big difference with Cowon U3. At least there is no that noticeable raise in mid-high, as it appears on chart.
Same for iPod with and w/o airline adapter.
Does that mean, the "Y-cable" loaded measurements with RMAA are incorrect?
