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2011-Sep

Measurements NUFORCE ICON Mobile

Nick Name: Golden Ears Registered Date: Sep 22, 2011, 22:22:39 IP ADRESS: *.56.123.5 Views: 12566

00.Nuforce_Headphone_Amp_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.

 

Line out

1. Digital (USB) Input Test  

01.FR_NO_LOAD_USB.png

Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile

  

 

02.TBL_NO_LOAD_USB_sum.png

Test Mode : 24bit, 44.1kHz

 

 

2. Analog (3.5mm Stereo) Input Test 

01.FR_NO_LOAD_Analog.png

Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile 

 

 

02.TBL_NO_LOAD_Analog.png

Test Mode : 24bit, 44.1kHz 

 

 

 

Headphone out

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.

 

1. Headphone Output 

03.FR_LOAD.png

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

Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile

 

 

04.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

  

05.IG.PNG

 

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