If anyone upgrades to an older Audio Precision I have a APIB USB ADAPTER for AP S1, S2, S2c & ATS2 to control them via OS of XP, Vista, Win 7,8 & 10. I also sell & service them.
Duke duke.aguiar@ieee.org
Duke duke.aguiar@ieee.org
Quick note:
I'm testing the Visual Analyzer latest beta with M4 and everything so far working great.
Also updated to latest win 10 driver.
This plot is un-calibrated, not at the lab today.
(fixed) I noticed a faint weird pixel thing at ***-end of scope trace and just assumed it was a communications or graphics glitch. Later it proved to be on 10ms intervals.
Tried different buffers sizes etc still would see on screen. It showed up in fft too.
I would see using other software too. Turned out to be windows real-time virus protect. Turned off now and all is peachy.
Setting on quick test are:
M4 config window 96000 1024 buffer
VA Beta- Running as administrator , 24bit,96000 2k fft buffer, un-calibrated vertical, input/output m4 ch1-2 out ch 1-2
Even though not using mic the e sys microphone cannot be 'disabled for apps' or you will see a system comm error. I guess VA checks all io devices in list.
VA64 (beta) is excellent professional software imo.
Download
I'm testing the Visual Analyzer latest beta with M4 and everything so far working great.
Also updated to latest win 10 driver.
This plot is un-calibrated, not at the lab today.
(fixed) I noticed a faint weird pixel thing at ***-end of scope trace and just assumed it was a communications or graphics glitch. Later it proved to be on 10ms intervals.
Tried different buffers sizes etc still would see on screen. It showed up in fft too.
I would see using other software too. Turned out to be windows real-time virus protect. Turned off now and all is peachy.
Setting on quick test are:
M4 config window 96000 1024 buffer
VA Beta- Running as administrator , 24bit,96000 2k fft buffer, un-calibrated vertical, input/output m4 ch1-2 out ch 1-2
Even though not using mic the e sys microphone cannot be 'disabled for apps' or you will see a system comm error. I guess VA checks all io devices in list.
VA64 (beta) is excellent professional software imo.
Download
Attachments
I see, the question is unexpected
Have you measured earphones output (with inset input, of course)? If so - on which load?The thing is, earphones are also subject of measurements
BTW, sincerely thanks for the information about inset inputs role: I have ordered 202, few hours later have met your post, then cancelled the order and ordered 204.
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Given thread's subject, I think this link contains the ADC with the best price/perf. ratio: Cosmos ADC | index.
Archimago and ASR have dedicated threads for this ADC, so worth reading both forums threads.
Archimago and ASR have dedicated threads for this ADC, so worth reading both forums threads.
There's a link on ASR thread. Aliexpress has it: E1DA Cosmos ADC Hi Precision Analog To Digital Converter For Audio Testing Bundle 1=Grade C Bundle 2=Grade B Bundle 3 =Grade A|Digital-to-Analog Converter| - AliExpress (VAT should be included).
Also check Archimago's Musings: EARLY LOOK: E1DA Cosmos ADC - affordable high performance measurements for the audio hobbyist! and E1DA Cosmos ADC | Audio Science Review (ASR) Forum too.
Also check Archimago's Musings: EARLY LOOK: E1DA Cosmos ADC - affordable high performance measurements for the audio hobbyist! and E1DA Cosmos ADC | Audio Science Review (ASR) Forum too.
I have not done any detailed measurements (loopback testing etc) of the headphone output no, I use only the RCA line level outputs on the rear for measurements.I see, the question is unexpected
The thing is, earphones are also subject of measurements
One thing I would say though - there is a lot of gain available in the headphone amplifier, so it can start clipping if you turn the headphone level up too high, and there is no clip indicator for the headphone output, so be aware of that.
Alright, this thing looks fantastic - it's exactly what I've been looking for for a long time now: A super-high-performance ADC at a reasonable price WITHOUT a bunch of front-end circuitry, which allows me to design my own front-end that can take up to 250 V_RMS for testing big power amps. The existence of this device might be enough to get me to revisit my design of an audio analyzer analog front-end, a project which has been mothballed for almost a year now.
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I see, the question is unexpected
The thing is, earphones are also subject of measurements
BTW, sincerely thanks for the information about inset inputs role: I have ordered 202, few hours later have met your post, then cancelled the order and ordered 204.
Headphone measurement, like any audio transducer measurement, is much less demanding of the ADC and DAC than things like line stages and power amplifiers, since the best transducers will have distortion an order of magnitude higher than even a mediocre DAC.
I wouldn't use the headphone amplifier in an audio interface for this kind of testing, because they are often limited in power. A really good headphone amplifier is about $100, or you could design your own for a lot less.
Did you actually measure a difference between M2 and M4 line inputs?
The M4 is impossible to find here in the UK, but M2 is in stock. The only thing stopping me getting the M2 is reading that the M4 has slightly better audio specs when tested - is this true? I have dedicated AAs at work, and the M2 is for keeping an eye on the home stereo (I don't want the home listening room invaded by ugly AAs - this will cause trouble!).
Thanks,
Topping D90 MQA measured with E1DA Cosmos ADC (grade A) in mono mode.
That would be a SINAD of 120.44 dB, pretty similar with what Amir measured here: Topping D90 Balanced USB DAC Review | Audio Science Review (ASR) Forum.
However, in Stereo mode the SINAD drops to about 117.7 dB, still a very respectable value for such a small an rather cheap ADC.
