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2011-Sep

Measurements E-MU 0404 USB

Nick Name: Golden Ears Registered Date: Sep 21, 2011, 21:22:11 IP ADRESS: *.56.123.5 Views: 21537

00.E-MU_0404USB_measure.jpg

 

 

Related Articles

* Golden Ears Philosophy

* How we measure (Phones, DAPs, Amplifiers)

* How to read measurements - Phones, DAPs, Amplifiers

* Measurements - Harmonics (THD, IMD)

* 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_192k.png

Sampling Frequency : 192kHz / E-MU 0404 USB

 

02.TBL_NO_LOAD.png

Test Mode : 24bit, 192kHz 

 

02.TBL_NO_LOAD-sum.png

 

 

 

2. Analog Input Test 

03..FR_No_Load_analog_192k.png

Sampling Frequency : 192kHz / E-MU 0404 USB

 

04.TBL_No_LOAD_analog.png

Test Mode : 24bit, 192kHz

 

04.TBL_No_LOAD_analog_sum.png

 

 

 

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 

05.FR_LOAD.png

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

Sampling Frequency : 44.1kHz / E-MU 0404 USB

 

06.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

 

 07.IG.PNG

 

 

 

Comment '2'

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