My test setup which is based on a Windows 10 laptop, REW software, Focusrite Solo 3rd Gen and DIY attenuation/connection box is described here:
https://www.audiosciencereview.com/...ement-setup-panasonic-xr57-avr-example.10589/
I recently purchased a China built Aleph 3 Class A power amplifier clone. It is a clone and it is based on a Class A amp that I knew in advance does not measure well and is definately not going to win any low noise/distortion awards. But, just for the heck of it, I wanted to try out the Class A amp with my bi-amped Magnepan 1.6 speakers. I am using the Class A amp on the tweeters and a second different Class-D based amp on the woofers. The Pass approach to amplifier design and management of distortion products (especially 2nd order) in the spectrum is described in a whitepaper about distortion in amplifiers here:
http://www.firstwatt.com/pdf/art_dist_fdbk.pdf.
Here are some photos of the Clone unit:
Looking at the internal photo you can see that the signal cables are routed close to the power wires and transformer. I did try rerouting the signal wires but that did not seem to improve the my measured results.
Anyway, I must say that despite the fact that this amp does not measure well, it really sounds good on the tweeters of my magnepans. Especially on live vocal and jazz type music giving a live air type feeling to the music.
The real non-clone version of the amplifier was previously measured by stereophile here:
https://www.stereophile.com/content/pass-labs-aleph-3-power-amplifier-measurements
From my measurements, it appears that the clone is similar in performance (specifically figure 7 in the referenced link above but the y axis scales/ranges are different).
Here are my measurements: ***(UPDATED MEASUREMENTS later in this thread)
https://www.audiosciencereview.com/...ement-setup-panasonic-xr57-avr-example.10589/
I recently purchased a China built Aleph 3 Class A power amplifier clone. It is a clone and it is based on a Class A amp that I knew in advance does not measure well and is definately not going to win any low noise/distortion awards. But, just for the heck of it, I wanted to try out the Class A amp with my bi-amped Magnepan 1.6 speakers. I am using the Class A amp on the tweeters and a second different Class-D based amp on the woofers. The Pass approach to amplifier design and management of distortion products (especially 2nd order) in the spectrum is described in a whitepaper about distortion in amplifiers here:
http://www.firstwatt.com/pdf/art_dist_fdbk.pdf.
Here are some photos of the Clone unit:
Looking at the internal photo you can see that the signal cables are routed close to the power wires and transformer. I did try rerouting the signal wires but that did not seem to improve the my measured results.
Anyway, I must say that despite the fact that this amp does not measure well, it really sounds good on the tweeters of my magnepans. Especially on live vocal and jazz type music giving a live air type feeling to the music.
The real non-clone version of the amplifier was previously measured by stereophile here:
https://www.stereophile.com/content/pass-labs-aleph-3-power-amplifier-measurements
From my measurements, it appears that the clone is similar in performance (specifically figure 7 in the referenced link above but the y axis scales/ranges are different).
Here are my measurements: ***(UPDATED MEASUREMENTS later in this thread)
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