I used a 0.6mm or so drill in a pin vice and put a hole through the board next to the can, such that the end of the can connection wire could connect to good/valid local ground (B), or either of the two crystal pins/pads (C/D).....this gives a choice of four sounds, ABCD.
Scrape and then and pre-tin top of the can quickly, then sweat solder pre tinned wire of your choice, I used component leads off cuts, or snips of CAT5 wire.......silver, gold ?.
I routinely fitted this invisible mod to hundreds of consumer CDP's as they went over my bench.....with practice it took me less than one minute, and then a couple of minutes of ABCD comparisons.
This quick mod/experiment/audition process was during final testing so there was no real time cost.
I got to experiment on a lot of makes/models for my own curiosity/data set.
BCD mod universally altered the sound of such consumer CDPs.
I found earthing the can always sounded better than standard/factory can floating condition....ie cleaner/clearer and more stable sounding, less fatiguing.
Connecting the can to either of the crystal pins gave another set of sounds, sometimes preferable, others not, so I settled on earthing because I found that connection always worked for the better, and customers (unwittingly) got better sounding machines.
Typical CDP crystal oscillator stages are sub optimal and are an area worth investigating while you do your rounds of measurements.
Dan..
opening-a-quartz-crystal-can-effects-thereof/
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If anyone has some commercial piano CD's where the jitter is as audible as tape or LP flutter please stand up.
Hmmm.
Mechanical system, tape/LP has different sound of speed aberration than digital.
I have piano/violin recordings that don't sound 'right' on CDP or usb DAC, and it's not the mics or harmonic distortions.
Jitter spectrum is the key regarding audibility...averaging measurements are somewhat useless as a yardstick of audibility.
Jocko (who ?) maintains that jitter is uncomfortably audible down to <<sub audio band modulation rates.
Many/most digital systems have system jitter effects that quite strongly impact vocals/mid and highs reproduction causing hardness/haze in sound and lessening of depth and loss of focus of L/R/C placement precision.
Bass is also impacted in that 'sense of power' and solidness of bass is diminished.
Jitter noise spectrum is sonically/subjectively mission critical.
Dan.
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Given all the measurements that show you have to try quite hard to get jitter artifacts up to the level of room noise floor how can you be so sure of that?
Would love for there to be something new and wonderful to fix in audio, but I'm lost as to what the boogeyman is here. Unless of course you like fixing up 1990 vintage cheap CD players.
I was thinking magnitude of the problem. BTW Thorsten L. designer of some rather impressive bespoke digital gear disagrees with him to the point IIRC they had quite an argument.
I have an existence proof IMHO of at least a few ordinary CD's that sound nearly flawless with respect to anything that would detract from the listening experience when played on ordinary off the shelf gear. Still waiting for for a couple of folks (one from each side) to sit down together (important) and do some serious no peaking listening.
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And it has to be said a completely bonkers copywriter for his AMR stuff. Oh and some snake oil USB purifiers with ifi. Can make one think he is veering towards 'genius' territory. Or he is a Bob Carver grade showman...
billshurv rispect for Thorsten L.please ! he have fine design on tube ,help a lot here at diyaudio and have fine taste for sure !!
IIRC Jocko's angle is that VLF jitter is 1/f rising and that makes it disproportionately audible.
Dan.
Even with English not as your first language this is some remarkable gibberish.
And now a forum violation. You are on a roll today.
Note rule 10 "Posting in a language other than English without a translation."
Note rule 10 "Posting in a language other than English without a translation."
Nah, I'm just saying he was into some fringe stuff but did digital without worrying about the "horrifying" 1/f jitter. Carver sometimes took mundane stuff and hyped it with impressive made up names.
From the AMR site Abbingdon Music Research - CD - 77 Reference Class Disk Processor
'Gomez' output stage
'OptiSignal(R)'
'OptiClockLock(R)'
Like I said, bonkers copywriter 🙂
Dick (or anyone else for that matter):
Have you had a chance to listen to MQA?
What are your thoughts about it?
mlloyd1
Have you had a chance to listen to MQA?
What are your thoughts about it?
mlloyd1
I guess you never listened to the "Digital Time Lens". 🙂. I'll bet price/hype aside the AMR CD player sounds pretty good rather than a goofy effects box.
EDIT - OOOps maybe I'm wrong.
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Yes, it's no worse than the $350 Marantz player I linked a day or two ago, which is quite an achievement for a fashion audio component.
He's into gold fuses that improve digital TV pictures now as well
Abbingdon Music Research - Products - Gold Fuse
However of course this assumes Thorsten 'is' AMR, whereas I would assume the relationship is similar to that between Musical Fidelity and TdP?
(dirty admission) If I won the lottery I might have the CD player for w*** value.
Abbingdon Music Research - Products - Gold Fuse
However of course this assumes Thorsten 'is' AMR, whereas I would assume the relationship is similar to that between Musical Fidelity and TdP?
(dirty admission) If I won the lottery I might have the CD player for w*** value.
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