audioeclectic
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- Mar 1, 2019
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It would be interesting if you measure the Yamaha A-S801 maybe the equivalent of this A-1, and compare both, the 801 include a delta sigma DAC with USB input.
This review suggests you may well be wrong: https://www.avhub.com.au/product-re...grated-amplifier-review-and-test-page3-393552
Not to answer for Amir but measurement at 1 kHz has become accepted practice. It is, therefore, likely that manufacturers would do anything they can to minimize THD+N at this frequency.
AU-9900 , AU-11000 , AU-20000 , AU-X1 , AU-777A they're my favorites. But there are many more. I would like a review of anyone.
The AS 801 is the same as the AS 701 apart from an additional usb input. The AS 701 is virtually the same as the AS 700 apart from the optical and coaxial inputs that the AS 700 lacks. Hence, the measurements of the AS 700 are likely to be quite representative of analogue amplifier performance compared to those for the AS 801.
I don't understand how you calculated, let alone how that would compare to the extremely good Australian numbers. Anyway, we can only be sure of really comparable numbers if Amir tests one.
They were designed by Peter Walker's team that way, to be sold and to match as a pair for their speakers. Why he chose those electrical parameters I can't say. Maybe it was typical for British components of the era?
I don't think the Quad 0.5 Volt output and input level were ever changed.
I don't care about THD at 10 khz since I cannot hear any of those distortion components - and I'm pretty sure this holds true for everybody.Amir, I am missing THD (+N) vs. frequency plots in your set of measurements, or CCIF 19+20kHz twin tone measurement. These old amplifiers from seventies were often good in THD 1kHz, however not so good in THD 10kHz or high frequency CCIF IMD.
The pinnacle of Sansui electronics?Have you seen this series?
By the time I got into HiFi the Sansui brand had been trashed. The TU-X1 was quite a beast!
Excellent point. I had forgotten that. In the 70s Brit-fi tended to adhere to (Euro) DIN standards and only later changed to using RCAs. Bad in one way, though because RCA commits the cardinal sin of connecting signal before ground.Don't forget, all the Quad gear initially came with European spec DIN connectors for inputs and outputs on the preamps and inputs on the power amps. The DIN spec was much higher sensitivity (lower level) than RCAs. (100mV in/ 500mV out for the Quads)
The 34/405-2/FM-4 stack I had was all DIN connections to all components- no RCAs.
It was only in later years (through the 34 and 405-2 years) where they changed over to RCAs. What changes to sensitivities they made, if any, I'm not sure.