I'm with you on that!
So maybe have them generate the signals? Hmmmm. The do have tight control over what can be cut. It would be great if LD could calculate the needed velocities for his tests
I'm cool with LDs list, tho I'd like to throw in a channel identification if it will fit. I also like sawtooth waves for easy polarity identification but maybe some of the tones already mentioned would do that.
Some of LDs tracks might need moving, e.g. white noise on the inside track likely won't have much upper FR.
So maybe have them generate the signals? Hmmmm. The do have tight control over what can be cut. It would be great if LD could calculate the needed velocities for his tests
I'm cool with LDs list, tho I'd like to throw in a channel identification if it will fit. I also like sawtooth waves for easy polarity identification but maybe some of the tones already mentioned would do that.
Some of LDs tracks might need moving, e.g. white noise on the inside track likely won't have much upper FR.
Well GZ does put all the files into their propitiatory software to master the disk before it's ever cut, so they must have a good handle on what their limits are.
As for his reference level, he says that 5 c/m is 9dB below the Neumann ref, meaning that +18dB from our reference should be 9dB above the Neumann reference level. Seems reasonable there would be at least 10dB headroom above reference. It's something to clarify with them. Isn't +18 the highest level usually cut?
Yes, I think the lathe manufacturer would use a reference level that suited the lathe and cutting performance not cartridge specs. So it needs to be clarified.
For reference CBS used 300Hz lateral +18dB re 11.2u peak as the torture track. We need to put all our track specifications in those type of terms. I think this is how they program their system which apparently closes the loop around everything to assure you get what you put in.
For reference CBS used 300Hz lateral +18dB re 11.2u peak as the torture track. We need to put all our track specifications in those type of terms. I think this is how they program their system which apparently closes the loop around everything to assure you get what you put in.
As long as you get the levels set right, I can live with the track list. Some if it I'll have to learn how to use. Thank god for liner notes!
Please make sure there are instructions on how to use some of this stuff.
-Chris
Please make sure there are instructions on how to use some of this stuff.
-Chris
And the mastering facility needs to be able to replicate settings of their lathe. In my conversation with Maillard, who seemed to take the aspect of proper test signal with minimal deviation from source seriously, he made it clear that test pressings will have to be done, inspected with an optical pickup and adjustments made to the cutter until the signals pressed on the record are close enough (whatever that is...).
Need to keep the p-p, rms, and L/R or lateral straight. 11.2 = 45/4 and 5 rms is 14.14 p-p can someone see the factor of two missing here? Maybe we need to know what the 14.14 refers to?
Handbook for sound engineers gives 3.54cm/s is 5.6u, I'm sure there is just a geometry issue here. 
I must be missing something, I think the two sets of numbers quoted are close to 9dB apart. So what am I missing?
Probably units on last of Scott's comments? (PP vs P??)
Probably units on last of Scott's comments? (PP vs P??)
Yes, people tend to be sloppy with peak vs p-p (6dB) and rms vs peak (3dB) and mix them freely. I assume the handbook is referring to microns rms and cm/sec rms which would jive with the CBS Labs numbers which are unambiguously spelled out on the liner notes, 3.54 cm/sec rms is a peak amplitude of 8 microns at 1kHz left or right only.
Makes sense to me, what I suspected. I should have recognized the 3.54cm/sec number I've seen it before. Yeah there is that rms thing... 😉
3.54 cm/s left or right only decomposes into 2.5 cm/sec vertical and lateral and hence for L+R or L-R it becomes 5 cm/sec for the same sidewall deviations. So there is still room for a 3db ambiguity if someone was speaking of only vertical or lateral motion, 11.2 microns deviation of one sidewall only is 8 microns of each lateral and vertical motion.
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Now I'm really confused. I thought it was just the classic 3dB error between peak and RMS of sine waves.
Ignore that it was just a speculation, we will not crash the mars probe with a missing factor of 3dB. 😉
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