
Ethan Winer
Acoustics Expert
After speaking at length with HHB they confirmed my suspicions about the CDR-850 converters and how the unit handles signal once it is converted. In short, Meyer and Moran did not have the 16-bit conversion they thought they did in using the CDR-850.
I heard back from Brad Meyer and I now have enough information to totally call BS on your claims. First, Brad told me it was impossible to get any solid technical information from the HHB people. Nobody there would admit to knowing anything about anything, and he tried several times. So unless you can give me the names of the people you spoke to, and an approximate date of your conversation, I have to assume said conversation never took place. Or that your recollection is "faulty" to put it politely.
More to the point, Brad sent me the service manual for that CD player which includes full specs when the device is placed inline:
Service Manual said:Record & Playback (Analog XLR-3 +4 dBu Input ® Analog XLR-3 +4 dBu Output)
Frequency Response 4 Hz ~ 20 kHz + 1.0, -1.5 dB (EIAJ)
S/N 83 dB or more
Dynamic Range 83 dB or more
Total Harmonic Distortion 0.01 % or less
Even more to the point, Meyer & Moran actually measured (and listened to) the output of the device, and their measurements confirmed the noise level was consistent with 16 bits. As Brad explained it to me:
E. Brad Meyer said:it doesn't matter whether you store the bits on a CD or not ... the audio performance is the same in monitor mode.
To use those 20-bit words instead of 16, and to reconvert the (presumably dithered) bit-stream to analog for those outputs, would (besides constituting a very strange and difficult-to-implement design decision) give you a 0dBFS-to-A-weighted-noise-floor ratio of about 116 dB. That's not what appears at the outputs. What does appear is absolutely typical CD-quality audio, with a slight droop in the frequency response before 20 kHz from the playback filter and an A-weighted noise floor a full 24 dB higher, at -92 dBA /re/ full scale, right where you would expect it.
So there you have it folks, another "Meyer & Moran denier" debunked with hard proof that cannot be refuted.
I'll be glad to post more from my lengthy exchange with Brad if anyone wants to see it. But that will have to wait until the weekend because I'm leaving now for a big hi-fi show in New York City where my company is treating several rooms.
--Ethan