JVS Cheerleads an MQA CD..Sis Boom Bah!

[mansr]

17 minutes ago, Rt66indierock said:

There is something like an identity crisis going on I see it in the press reaction to me at shows. There is confusion in the industry because of our reaction to MQA but many see the pendulum swinging back towards more objectivity as a good thing. 

Anyone not in the snake oil business should appreciate a more objective approach.

[mansr]

2 minutes ago, Kal Rubinson said:

I did not intend to imply what you inferred (and I do not believe that I did).

Acquisition is a neutral term.

[mansr]

Thanks for posting that. Firstly, we see that the MQA control stream is in bit 8, which is counted as though it were a 24-bit file. In other words, it is in the LSB of the 16-bit CD data. That means there is no high-frequency content to be decoded here. Curiously, the MQA signature is not found at the start of the track but some distance in as indicated by the sample number printed at the start of the line. Even more odd is that the packet printed for track 2 is not the first in an MQA stream as evidenced by the presence of the 'stream_position' field which indicates the offset in samples from the start of the track to the start of this packet. Curiouser and curiouser. Finally, note the 'mqa_level' value. This controls the indicator colour. Blue tracks have a value of 0x90 rather than the 0x40 seen here. Unfortunately, I don't know the exact meaning of this value.

[mansr]

11 minutes ago, Brinkman Ship said:

For those of us who missed it..just HOW do you play an MQA CD? Do you have to have a transport with a USB output?

Or a DAC that decodes MQA from S/PDIF. I think the Mytek ones do.

[mansr]

6 minutes ago, Brinkman Ship said:

I thought that might be it..but for some reason I though MQA was not compatible with S/PDIF..

It depends on the signal routing. Some DACs use an XMOS or other powerful processor only for USB input and a simple S/PDIF decoder chip feeding the DAC directly. Such designs can't support MQA on inputs that don't go through the processor.

[mansr]

57 minutes ago, testikoff said:

Can anyone comment on contents of Bob's recent posts specifically in regard to MQA CDs?

 

http://www.bobtalks.co.uk/2018/09/

Without reading it: utter tripe.

[mansr]

2 minutes ago, testikoff said:

Are you saying that the above mentioned Bob Stuart's posts are entirely false?

I assume so, based on his habit of lying through his teeth.

[mansr]

53 minutes ago, testikoff said:

Can you debunk his statements regarding out-of-band spectral content of MQA CD audio?

If he says there is any, sure.

[mansr]

3 minutes ago, testikoff said:

So is there any truth in Bob Stuart's statements regarding B (i.e. 22...44 kHz or 24...48 kHz out-of-band spectral content) "estimates" in 16-bit MQA-CD audio of recent Warner & Uni Japan releases?..

None whatsoever.

[mansr]

1 minute ago, testikoff said:

Thanks for confirming. Is it fair to say that all the MQA-CD does is carry the original sampling rate of the PCM master & the preferred upsampling filter to be used by the MQA-enabled renderer/DAC?

It also has the cryptographic "authentication" signature and may include some HDCD-like dynamic range extension data. Remember, this data stream is limited to one bit per stereo sample, so there's really not much space available.