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18

2011-Oct

Measurements Apple iPhone 4

Nick Name: Golden Ears Registered Date: Oct 18, 2011, 00:25:02 IP ADRESS: *.56.123.5 Views: 15362

00.Apple_ iPhone_4_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 Lossless Test Result  

01.fr_Applelossless.png

Sampling Frequency : 44.1kHz / Apple - iPhone 4

 

 

01.TBL_Applelossless.png

Test Mode : 16bit, 44.1kHz

 

 

2. AAC Test Result

02.fr_AAC.png

Sampling Frequency : 44.1kHz / Apple - iPhone 4

 

 

02.TBL_AAC_com.png

Test Mode : 16bit, 44.1kHz

 

 

3. MP3 Test Result

03.fr_mp3.png

Sampling Frequency : 44.1kHz / Apple - iPhone 4

 

 

03.TBL_mp3_com.png

Test Mode : 16bit, 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.

 

 

04.fr_Load.png

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

Sampling Frequency : 44.1kHz / Apple - iPhone 4

 

 

 04.TBL_Load_com.png

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

Test Mode : 16bit, 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

  

05.IG.png

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