- Thread Starter
- #321
Frequency Response Measurements in Digital Level, in DAC8PRO's Analog Output Level and in Amplifier's Output Level
Note: I am an end user audio enthusiast and I have no conflict of interest at all with any of the manufacturers, import companies, distributors and audio shops relevant to this post. This post is not intending to intensively share objective and/or subjective evaluations of the candidate amplifiers, but I would like to share about how I would test and try candidate amplifiers in this project.
Hello friends,
As shared in my post #311, my (provisionally) completed multichannel multi-amplifier system can be summarized in these four diagrams;
For the details of these diagrams, you would please visit my post #311 where you can find the larger ones.
In my post #318, I also shared the "L + R Frequency Response at Usual Listening Position in the Listening Room and Environments" as shown here again;
Even though I have rather little interest in Fq response curves at very near (1 m?) from the SP drivers, I am always curious about Fq responses in the digital level (after crossover) signal, in DAC8PRO's analog line level output, and also in amplifier's output level to see and confirm that the EKIO's crossover configurations would be properly reflected in these signal levels.
Using the software crossover EKIO's very flexible I/O routing and REW's flexible ASIO I/O configuration, I could easily measure the Fq responses in these signal levels.
I first measured the digital level Fq responses, after EKIO's DSP-EQ processing, by looping-back the DIYINHK ASIO digital signals into REW within the PC;
It is very nice to see and confirm that the EKIO's crossover configurations are properly reflected in the digital level signals as well as the cleanliness of the signals.
Next, I measured the analog output channels of DAC8PRO by looping-back the line level signals into PC's Realtek HD Audio's line-in for REW's "measurement";
Please note that the on-board "line-in" of Realtek-HD Audio in the PC's motherboard would not be a high-end Hi-Fi device (as you can see the noise floor level), but I tentatively used this loop-back for simplicity and convenience.
Finally, I also measured the line-level output signals from the three amplifiers, i.e. YAMAHA A-S3000 to drive woofers, ACCUPHASE E-460 to drive Be-squawkers, and SONY TA-A1ES to drive Be-tweeters and super tweeters;
I hope that these digital level and line level Fq response measurements would be also of your interests and reference in this type of multichannel multi-amplifier project with digital software crossover solutions.
Note: I am an end user audio enthusiast and I have no conflict of interest at all with any of the manufacturers, import companies, distributors and audio shops relevant to this post. This post is not intending to intensively share objective and/or subjective evaluations of the candidate amplifiers, but I would like to share about how I would test and try candidate amplifiers in this project.
Hello friends,
As shared in my post #311, my (provisionally) completed multichannel multi-amplifier system can be summarized in these four diagrams;
For the details of these diagrams, you would please visit my post #311 where you can find the larger ones.
In my post #318, I also shared the "L + R Frequency Response at Usual Listening Position in the Listening Room and Environments" as shown here again;
Even though I have rather little interest in Fq response curves at very near (1 m?) from the SP drivers, I am always curious about Fq responses in the digital level (after crossover) signal, in DAC8PRO's analog line level output, and also in amplifier's output level to see and confirm that the EKIO's crossover configurations would be properly reflected in these signal levels.
Using the software crossover EKIO's very flexible I/O routing and REW's flexible ASIO I/O configuration, I could easily measure the Fq responses in these signal levels.
I first measured the digital level Fq responses, after EKIO's DSP-EQ processing, by looping-back the DIYINHK ASIO digital signals into REW within the PC;
It is very nice to see and confirm that the EKIO's crossover configurations are properly reflected in the digital level signals as well as the cleanliness of the signals.
Next, I measured the analog output channels of DAC8PRO by looping-back the line level signals into PC's Realtek HD Audio's line-in for REW's "measurement";
Please note that the on-board "line-in" of Realtek-HD Audio in the PC's motherboard would not be a high-end Hi-Fi device (as you can see the noise floor level), but I tentatively used this loop-back for simplicity and convenience.
Finally, I also measured the line-level output signals from the three amplifiers, i.e. YAMAHA A-S3000 to drive woofers, ACCUPHASE E-460 to drive Be-squawkers, and SONY TA-A1ES to drive Be-tweeters and super tweeters;
I hope that these digital level and line level Fq response measurements would be also of your interests and reference in this type of multichannel multi-amplifier project with digital software crossover solutions.
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