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Post by creimes on Aug 6, 2020 14:28:02 GMT -5
A Canadian cult classic  It seems it will remain a Canadian cult classic as it doesn’t play in the USA. 🤷♂️ Really, that's the first time I have heard of that, it's usually the other way around   |
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Post by leonski on Aug 10, 2020 12:04:43 GMT -5
All that jitter talk was bs, imo. Nope. I heard what I heard. And went around a couple laps with Cambridge for the 'fix'. They claimed 'known issue' and update to FW was the fix. If you have a better explanation for the awful (think fingers on chalkboard) screech I heard, please let me know. That being said, it was MAINLY an unfortunate equipment interaction. I doubt that most DACs will suffer as my $$$ CA 840 did. cheers. |
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Post by audiobill on Aug 10, 2020 12:30:08 GMT -5
What model number is your Airport Express?
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Post by leonski on Aug 11, 2020 14:13:24 GMT -5
What model number is your Airport Express? Long Gone. I'm not certain, in looking back, if it was a G1 or G2 AE...... |
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Post by audiobill on Aug 11, 2020 14:52:02 GMT -5
Gee, that's too bad, as the jitter numbers improved a lot from G1 (model A1264) to G2 (A1392)
From the June, 2012 Computer Audiophile:
Executive Summary:
A1264:
"First Generation AirPort Express - WAV, AIFF, Apple Lossless, MP3, and AAC files at 16 bit / 44.1 kHz are bit perfect (without data loss) from iTunes to the AirPort and through the AirPort's optical output. All other sample rates including 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz are converted to 44.1 kHz. All 24 bit content is truncated to 16 bits. The phase remains correct even with bit truncation from 24 bits to 16 bits. Both 16 bit DC and Walking Zero tests were bit true as well. 24 bit Walking Zero was truncated to 16 bit.
Playback of a 997 Hz test tone measured at the digital output of the AirPort Express displayed a bit higher noise at 48 kHz. Playback of the same test tone at 176.4 kHz and 192 kHz displays severe distortion as the sample rate converter is overdriven.
The AirPort Express always sent out the same status bit and Copyright bit.
Warning: The following jitter numbers should not be used as the only indicator of the AirPort Express' performance. These numbers are but one indication of sound quality. The average jitter from 700 Hz to 100 kHz is about 474 picoseconds on the digital optical output. Peak jitter from 50 Hz to 100 kHz is about 1.52 nanoseconds on the digital optical output."
A1392:
"Second Generation AirPort Express - WAV, AIFF, Apple Lossless, MP3, and AAC files at 16 bit / 44.1 kHz are bit perfect (without data loss) from iTunes to the AirPort and through the AirPort's optical output. All other sample rates including 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz are converted to 44.1 kHz. All 24 bit content is truncated to 16 bits. The phase remains correct even with bit truncation from 24 bits to 16 bits. Both 16 bit DC and Walking Zero tests were bit true as well. 24 bit Walking Zero was truncated to 16 bit.
Playback of a 997 Hz test tone measured at the digital output of the AirPort Express displayed a bit higher noise at 48 kHz. Playback of the same test tone at 176.4 kHz and 192 kHz displays severe distortion as the sample rate converter is overdriven.
The AirPort Express always sent out the same status bit and Copyright bit.
Warning: The following jitter numbers should not be used as the only indicator of the AirPort Express' performance. These numbers are but one indication of sound quality. The average jitter from 700 Hz to 100 kHz is about 280 picoseconds on the digital optical output. Peak jitter from 50 Hz to 100 kHz is about 1.25 nanoseconds on the digital optical output."
Best,
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