22
2011-Sep
Measurements NUFORCE ICON MobileNick Name: Golden Ears Registered Date: Sep 22, 2011, 22:22:39 IP ADRESS: *.56.123.5 Views: 6765
* How we measure (Phones, DAPs, Amplifiers)
* How to read measurements - Phones, DAPs, Amplifiers
* 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.
1. Digital (USB) Input Test
Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile
Test Mode : 24bit, 44.1kHz
2. Analog (3.5mm Stereo) Input Test
Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile
Test Mode : 24bit, 44.1kHz
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
R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω
Sampling Frequency : 44.1kHz / NUFORCE ICON Mobile
R16:16Ω / R33:33Ω / R62:62Ω / R250:250Ω
Test Mode : 24bit, 44.1kHz
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
Images, text and measured data by Golden Ears Corporation is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
Golden Ears Test System - for more information (Link)
1. HATS: Bruel & Kjær - Head and Torso Simulator Type 4128C
2. Microphone Amplifier: Bruel & Kjær - NEXUS Conditioning Amplifier
3. Audio Interface: Lynx L22
4. DAC: Golden Ears D/A Converter
5. Headphone Amplifier: Golden Ears Headphone Amplifier
How we test
1. Headphone / Earphone
2. Speaker
3. Amplifier / DAP
How to read G.E. Graph
1. Earphone / Headphone
2. Speaker (Directivity Pattern)
3. DAP / Amplifier
-
-
- 00.Nuforce_Headphone_Amp_measure.jpg [File Size:50.7KB/Download:119]
- 05.IG.PNG [File Size:11.5KB/Download:4]
- 01.FR_NO_LOAD_USB.png [File Size:29.5KB/Download:5]
- 02.TBL_NO_LOAD_USB_sum.png [File Size:11.5KB/Download:4]
- 03.FR_LOAD.png [File Size:29.0KB/Download:4]
- 04.TBL_LOAD.png [File Size:12.8KB/Download:4]
- 02.TBL_NO_LOAD_Analog.png [File Size:11.7KB/Download:5]
- 01.FR_NO_LOAD_Analog.png [File Size:28.4KB/Download:4]
