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Majestic DAC

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    Posted: 22 Jul 2014 at 11:29am
I read about your Majestic DAC
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The following measurements taken at 24 bits and sampling rates of
Coax inputs: 192kHz
Optical inputs: 96kHz
USB input: 48kHz

Are this the upper limits of the sample frequencies at this inputs? 

I want to use TOSLINK (on a Mac) and 192kHz - this is a must have feature for me!

Could the potentiometer bypassed? I don't want to use any loudness regulators in a DAC.

AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stewboss Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 1:08pm
Equipment choices:

Playstation 3 SACD, Bitzie DAC, Meridian Explorer DAC, Lautus USB cable, HD250-II, HD650
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 4:59pm
As the optical inputs are decoded and sent as data to the S/PDIF input of the Wolfson WM8804 tranceiver (re-clocker) and the same input is used for 192kHz coax (depending on switch position) then if the optical transmitter (on your MAC) can do 192 kHz, and it can be accomodated by our 15.5Mbps receivers (sorry, I forgot the math) then it should work.

The spec says 92kHz because that is the maximum optical sampling rate output of our test gear.

-----------------------Edit--------------------

Brain fade gone... (I am in the midst of doing the quarterly accounts!)...

OK, so the optical receiver does 15.5Mbps (megabits per second).

The sampling rate is 192,000 Hz (192,00 times per second) and the number of bits to each sample is 24 (actually it's 20 bits of audio and 4 bits of rammel...), and there are two channels, so...

192,000 x 24 x 2 = 9,216,000 bits per second transfer rate... or 9.216 Mbps

Therefore the receiver (the optical cable input) can do more than that, and so therefore will output the same.

This is then read as 192/24 by the receiver (tranceiver) chip and converted to I2C and sent to the DAC chip, which can do it.

If we talk quietly the Majestic will not notice that it's coming in by a different route and will process it Wink


Edited by Graham Slee - 22 Jul 2014 at 5:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 6:00pm
Second answer: THERE ARE NO LOUDNESS REGULATORS IN THE DAC

There is an analogue preamp after the DAC and in it there is a level control.

There is a low level output before the level control: 309 mV nominal

There is a high level balanced output after the level control: +8dBu (just under 2 volts rms) nominal

The level control pot is a proper analogue control - Alps in origin - has the normal rotary tracks and wipers that preamp volume controls use. Park it where you find it best.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LOINER Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 6:13pm
Originally posted by Graham Slee Graham Slee wrote:


If we talk quietly the Majestic will not notice that it's coming in by a different route and will process it Wink



STUART
SOLO ULTRA LINEAR DIAMOND EDITION
LAUTUS DUAL MONO 1.5M INTERCONNECTS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FritzS Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 6:22pm
Originally posted by Graham Slee Graham Slee wrote:

Second answer: THERE ARE NO LOUDNESS REGULATORS IN THE DAC

There is an analogue preamp after the DAC and in it there is a level control.

There is a low level output before the level control: 309 mV nominal

There is a high level balanced output after the level control: +8dBu (just under 2 volts rms) nominal

The level control pot is a proper analogue control - Alps in origin - has the normal rotary tracks and wipers that preamp volume controls use. Park it where you find it best.

Could this level control Alps potentiometer bypassed?
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII
Marantz SA7001 KI, Philips CD650
Revox B790, G1042, Reflex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jul 2014 at 6:48pm
I could bypass it if you really want me to.

Or you could park it up at maximum so it becomes in-effect a resistor to ground with the upper connection being the wiper positioned on the end of the element.

If I were to bypass it, I would have to cut the PCB tracks and rejoin them by hard wiring.

The control would have to be left in situ otherwise it would look a mess having a hole and recess.

It could be best to ask Suggs to send you one to ensure it does 192 optical (although it should) before you buy.

The only problem I have right now is getting the European loaner Majestic to Suggs because the production staff who do those things are on vacation for 2 weeks.
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