ipod classic 7th gen specifics
Aug 27, 2012 at 7:44 AM Post #109 of 120
Dec 14, 2012 at 8:34 PM Post #110 of 120
I've been using a 6th. 120 in my car for about 2-3 years and a 5th 60 for travel for longer, maybe 7-8 years.
All the time my iTunes library held between 7-8,000 songs in MP3 format.
 
I discovered H.F 4 months ago and all hell broke loose. LOL
 
Now I use a 6th, v2 160 for my portable rig and the 120 still in the car. I've re-ripped and have turned 2/3 of the MP3s in ALAC. Of course synced both 120 and 160.
 
All this background to ask this question:
 
I am noticing in all three; iTunes,120, and 160 iPods when in Shuffle mode, at lest 1/2 the time the selection of songs are repeating over and over again. Even sometimes after only 15 songs.
Is anyone else experiencing this phenomena ?
 
Jan 6, 2013 at 11:42 PM Post #111 of 120
Quote:
saraguie said:
I've been using a 6th. 120 in my car for about 2-3 years and a 5th 60 for travel for longer, maybe 7-8 years.
All the time my iTunes library held between 7-8,000 songs in MP3 format.
 
I discovered H.F 4 months ago and all hell broke loose. LOL
 
Now I use a 6th, v2 160 for my portable rig and the 120 still in the car. I've re-ripped and have turned 2/3 of the MP3s in ALAC. Of course synced both 120 and 160.
 
All this background to ask this question:
 
I am noticing in all three; iTunes,120, and 160 iPods when in Shuffle mode, at lest 1/2 the time the selection of songs are repeating over and over again. Even sometimes after only 15 songs.
Is anyone else experiencing this phenomena ?
Click to expand...

 
 
 
dont know i didnt use shuffle for my ipod classic 7th gen when i had it, now its given to my kid brother along with the fiio e17 amp on it. 
 
Jan 15, 2013 at 9:27 AM Post #112 of 120
Quote:
cooperpwc said:
 
Work your way through this thread. People have successfully installed 240GB SSDs in the 7G. 
 
http://www.head-fi.org/t/566780/official-ipod-video-classic-5g-5-5g-6g-6-5g-7g-ssd-mod-thread
Click to expand...

I think you are speaking about a regular HDD and not an SSD into an iPod 7G 160GB (2011-now). So far, I have read on that topic that people managed to put larger SSDs only on 5.5G iPod, but not on 7G.
Anyone can confirm and maybe to show me the reply where it was someone able to install an larger capacity SSD on iPod 7G?
 
Sep 4, 2013 at 11:40 AM Post #113 of 120
Re: Wolfson vs Cirrus Logic DACs.
 
Here are some objective measurements of the audio from the Classic 7G 160GB:
http://www.markuskraus.com/RMAA/classic/data.htm
 
Pay attention, in particular to frequency response result which has been highly praised here, and stereo crosstalk, where the Wolfson-equipped 5G supposedly delivers appalling performance:
 

Frequency response

http://i.imgur.com/tYwnIFr.png
From 20 Hz to 20 kHz, dB -3.04, +1.22
From 40 Hz to 15 kHz, dB -3.04, +1.22
 

Stereo crosstalk

http://i.imgur.com/GKxUXlF.png
  Left
 Right
Crosstalk at 100 Hz, dB -75
 -74
Crosstalk at 1000 Hz, dB -83
 -82
Crosstalk at 10000 Hz, dB -48
 -47
 
 
 
 
Now compare results from the same tests run on the 5G Video:
http://yuriv.home.gate.net/RMAATests/iPod%20vs%20dock.htm
 

Frequency response

http://i.imgur.com/IhQZTjW.png
 

Stereo crosstalk

http://i.imgur.com/7SjF3tp.png
 
Now, if the Classic 6G and 7G have a superior signal path compared to the 5G and 5.5G, as posited by other members here, then why do they have such bad performance compared to the "dirty" 5G/5.5G? I can only surmise it must be the DACs.
 
Sep 4, 2013 at 2:19 PM Post #114 of 120
You have posted the ipod 7th gen headphone out test. not the ipod 7th gen LOD test. I also have doubts about the actual load for the test. The headphone out of both was supposed to be pretty flat overall but rolled off in the bass depending on the load. The line out dock of both is fairly flat all over, and is a DAC output. Thats the entire point of LOD connectors on ipods. Sonove has the RMAA for 6th and 7th gen ipods (they are the same inside apart from the difference in HDD size) and shows that the LOD performance of the newer ipods is fantastic.

These RMAA generated pages have one major flaw: no view of the actual testing setup/chain. People dont fill that information out correctly, nor do they post any sort of calibration of their own line inputs on their sound cards.
 
Sep 5, 2013 at 1:25 AM Post #115 of 120
shrimants said:
You have posted the ipod 7th gen headphone out test. not the ipod 7th gen LOD test. I also have doubts about the actual load for the test. The headphone out of both was supposed to be pretty flat overall but rolled off in the bass depending on the load. The line out dock of both is fairly flat all over, and is a DAC output. Thats the entire point of LOD connectors on ipods. Sonove has the RMAA for 6th and 7th gen ipods (they are the same inside apart from the difference in HDD size) and shows that the LOD performance of the newer ipods is fantastic.

These RMAA generated pages have one major flaw: no view of the actual testing setup/chain. People dont fill that information out correctly, nor do they post any sort of calibration of their own line inputs on their sound cards.
Click to expand...

 
What he said. Here is the Sonove link:  http://sonove.angry.jp/RMAA/iPod%20Classic%206th%20160G.htm
 
Sep 5, 2013 at 6:16 AM Post #116 of 120
The Markus Kraus RMAA tests are done with the UE TF10 IEMs, which require very low output impedance. The iPod Classic results show that the Classic's output impedance of 5.5Ω is too high. And since the 5G tests are from the LOD and unloaded, they are absolutely not comparable.

The iPod 5.5G has a similar output impedance of 5.3Ω, so the frequency response graph would be pretty much the same as with the iPod Classic.
 
Sep 5, 2013 at 7:24 AM Post #117 of 120
How is he testing through UE TF10's anyways? Is this a dummy mic head or what? IMO he should be doing headphone out -> sound card line in, or LOD -> sound card line in. If he's trying to simulate a load, that shouldnt make much difference depending on how the test is run...The input impedance of an amplifier is technically infinite, and that should be providing the ipod with an infinite load to drive....unless he's got it clamped to banana clips and RMAA is running the way a voltmeter does. (Thats got to be the case, i think)
 
Sep 5, 2013 at 8:20 AM Post #118 of 120
He's running RMAA tests exactly the way they should be done: with the IEMs (or headphones) attached to the headphone out via a stereo splitter cable. That's the only way to get realistic measurements. Also, that's not "simulating" a load: it's measuring an actual load. The input impedance of an ADC is way too high to skew the output of a DAP: the effect is worse as the impedance of headphones is close to or lower than the output impedance of the DAP.

If you only ever use the LOD with a headphone amplifier, then measure both the LOD (unloaded, obviously), and the output of your headphone amplifier when connected to the LOD.

EDIT: here's the iPod Classic LOD for you, and the unloaded headphone out.
 
Sep 5, 2013 at 8:37 AM Post #119 of 120
Ah ok. Thanks, that makes a lot more sense. I assume the adc input doesn't mess with overall impedance? I feel like it should act as a voltage Divider or current divider
 
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