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2013-Feb

Measurements Apple iPod touch 5G

Nick Name: Golden Ears Registered Date: Feb 15, 2013, 00:57:48 IP ADRESS: *.56.123.5 Views: 18282

00.iPod_touch_5G_measure.jpg

 

 

Related Articles

* Golden Ears Philosophy

* How we measure (Phones, DAPs, Amplifiers)

* How to read measurements - Phones, DAPs, Amplifiers

* Distortion and the Data

* Frequency response & perceived sound 

  

Note.

Please keep in mind that the following data are from a test unit reviewed by Golden Ears - the test unit is not necessarily a representative sample of the model being reviewed.

 

Decoder Test

 1. Apple-Loseless Test Result (Lossless File) 

01.FR_Apple-Loseless.png

Sampling Frequency : 44.1kHz / Apple - iPod touch 5G

 

02.TBL_Apple-Loseless.png

Test Mode : 24bit, 44.1kHz

 

 

2. AAC Test Result 

03.FR_AAC.png

Sampling Frequency : 44.1kHz / Apple - iPod touch 5G

 

04.TBL_AAC.png

Test Mode : 24bit, 44.1kHz

 

  

3. MP3 Test Result 

05.FR_MP3.png

Sampling Frequency : 44.1kHz / Apple - iPod touch 5G

 

06.TBL_MP3.png

Test Mode : 24bit, 44.1kHz

 

 

Amplifier Test

A given headphone output may accommodate many different headphones - in general, a smaller load impedance (on headphones) will lead to a larger sound, but at cost of accuracy in measurable data due to the increased current - this cost usually manifests in an increasingly weak bass and elevated crosstalk values as the load impedance decreases. The purpose of the tests to follow is to see how these values change as a function of impedance. 

 

07.FR_Load.png

R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω

Sampling Frequency : 44.1kHz / Apple - iPod touch 5G

 

08.TBL_Load.png

R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω

Test Mode : 24bit, 44.1kHz

  

 

Output Impedance

A lower impedance is desirable on the headphone outputs of amplifiers. The output impedance is closely related to the damping factor, and is one of the most important parameters that determine headphones' performance - desktop amps tend to exhibit high impedance values, corresponding to poor performance.

 

Interaction between output impedance and phones  

 

09.IG.PNG

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