John Curl's Blowtorch preamplifier part III

Status
Not open for further replies.
Do I understand this correctly... you should dither only at the end or last/final step?

-RNM

Generally, yes.

this presupposes that the data are kept longer than the storage format. ie 32 bit float source, process (gain change, eq, whatever) on a 64 bit buss, to store you need to fit it into the format of your choice, 32 float for intermediate work say. I think reaper and most today will truncate at this point, but that isn't much of a problem as there is still enough resolution to dither it into a fixed point output later.

If one were to output to 16bit from 32 bit float after any processing, then you would want dither at that point, otherwise you would get all the attendant problems of truncation. Most people also want to dither into 24bit from floating bit today.

hope that helps

Cheers
Alan

I see Markw4 has beat me to it, don't disagree with anything he said
 
Last edited:
In the name of scientific method please provide precise examples and justifications of your accusations of each of the categories you state above.
Just review the external links in your recent posts, you see plenty.
So the file differences supposedly did not survive upload/Dropbox storage/download process to your PC
Sure, that's it.
, this was a casual test with no controls like how good is your hearing and how good is your system.
My hearing is fine, thank you, and you said many times that the difference was obvious to untrained casual listeners. As for my system, I am certain it is superior to the bookshelf all-in-one you referred to, and much better than the built-in speaker in your phone, which was another of your references.
There were numerous experiments and listeners responded with same/similar descriptions of these differences without coaching of any kind. I posted a link to Test Dept files a few posts back.....can you hear the differences ?. Dan.
Since absolutely no one who downloaded your bit-identical files could hear a difference, I assume that either the playback that you used for your local listeners was pathologically faulty, or you don't even know when you are coaching. As for the rest, no thank you. It has already been shown by several folks here that the files are not suitable for any kind of test, and I am not interested in testing any more of your claims, it is not worth my time.
 
Z, 90 degrees, resistance, maybe you should join Joe back in school.
Ok I will play your word games. I think you know what i am talking about, in any case.

I dont like doiing a lot of typing... short hand notes - even with misspelled or mis-typed words, is fine IMO.

Connect the dots... fill-in the blanks, yourself.

-RNM

first order filters do that
yes??? That seems what BYEBEE is.

-RNM
 
Hi there!
John complained that I ignore his thread, so here I am! 😀

There is no skin effect at LF, what is the above supposed to mean?
There is, but laughably small one. In audiophile world the presence of some effect matters, not it's influence. It is like homeopathy in medicine, enough to induce placebo-effect to amplify hypnotic suggestion. 😀
 

Attachments

  • IMG_6135.JPG
    IMG_6135.JPG
    261.7 KB · Views: 262
Dithering after truncation is not useful. If truncation is to be performed by Reaper then by default it dithers unless someone unchecks the box so as to disable it. Thus, not clear to me what preprocessing we might be talking about. Preprocessing prior to importation into Reaper? Or, preprocessing by plugins performed in Reaper that resulted in extended bit-depth below 16-bits? I ask because I have plenty of experience with Reaper and dithering, and I am trying to make sense of how Reaper might gray out the dither option if dithering should be applied.
Yes, I want to start with any file and convert it to 24bit wav file so that I can run loopback recordings of a variety of loopback cables. Many recordings are maximised to 0dB or just under and many of these 'go over' on playback so I find 2dB and sometimes 3dB attenuation is required to avoid record input clipping with precisely fixed unity input gain structure.

So all minds here please, what is committee approved method/software of converting any audio file to 24bit with attenuation of some amount, fixed 3dB would be ok ?.
Once this is established I can move on and test and compare a range of cables with real music waveforms and capture valid differences for analysis.

Scott, the Test Dept file was captured as 16bit wav file from Youtube streaming so is not full quality in the first case.....I now have Disturbance album in CD quality, with an active sub filling in the bottom stuff it cranks big time, lot's of fun, I'm enjoying Test Dept, thanks !.

RNM this album is 'got bass' bigtime, it's a pity your system is packed down. What did the extended background listening to the DAC-3 reveal ?.

Dan.
 
Last edited:
Status
Not open for further replies.