Analog-Precision Board

Products by Analog-Precision => Ultimate-Preamplifier by Analog-Precision => Performance and Measurements => Topic started by: Tranquility Bass on March 17, 2021, 07:21:22 AM

Title: DAC (19kHz + 20kHz) CCIF IMD test
Post by: Tranquility Bass on March 17, 2021, 07:21:22 AM
Test Methodology:

The configuration is loaded with a twin tone in the signal generator, with two high frequency tones (19kHz + 20kHz) at amplitudes of -7dBFS each, and separated in frequency by 1kHz. The analyzer measuring the first-order difference frequency at 1kHz using a highly-selective FFT-based filter.



Test Results:


Conclusion:

The following test results show that the IMD distortion of the Ultimate Preamplier is exceedingly low and betters the performance of the DEQX Pre-mate by a long margin !






Title: 2-Channel Direct DAC mode
Post by: Tranquility Bass on March 17, 2021, 07:23:39 AM
 
Title: 2-Channel Preamplifier Mode using the ASRC
Post by: Tranquility Bass on March 17, 2021, 07:24:33 AM
 
Title: IMD vs Ampltude
Post by: Tranquility Bass on March 17, 2021, 12:03:41 PM
Title: DEQX PreMate, HF intermodulation spectrum
Post by: Tranquility Bass on March 18, 2021, 02:02:10 AM
Fig.12 DEQX PreMate, HF intermodulation spectrum, DC–30kHz, 19+20kHz at 0dBFS into 100k ohms (left channel blue, right red; linear frequency scale). (https://www.stereophile.com/content/allnic-d-5000-dht-da-processor-measurements-0)

Note how the noise floor is lifted up by the two tones whereas this is totally absent in the UP spectrum above ! Again the UP wins hands down !

(https://www.stereophile.com/images/1214DEQXFig12.jpg)